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< h3 > < a href = "../index.html" > Table of Contents< / a > < / h3 >
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< li > < a class = "reference internal" href = "#" > NPC merchants< / a > < ul >
< li > < a class = "reference internal" href = "#making-the-merchant-class" > Making the merchant class< / a > < / li >
< li > < a class = "reference internal" href = "#coding-the-shopping-menu" > Coding the shopping menu< / a > < / li >
< li > < a class = "reference internal" href = "#the-shop-is-open-for-business" > The shop is open for business!< / a > < / li >
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< section class = "tex2jax_ignore mathjax_ignore" id = "npc-merchants" >
< h1 > NPC merchants< a class = "headerlink" href = "#npc-merchants" title = "Permalink to this headline" > ¶< / a > < / h1 >
< div class = "highlight-default notranslate" > < div class = "highlight" > < pre > < span > < / span > *** Welcome to ye Old Sword shop! ***
Things for sale (choose 1-3 to inspect, quit to exit):
_________________________________________________________
1. A rusty sword (5 gold)
2. A sword with a leather handle (10 gold)
3. Excalibur (100 gold)
< / pre > < / div >
< / div >
< p > This will introduce an NPC able to sell things. In practice this means that when you interact with them you’ < em > menu< / em > of choices. Evennia provides the < a class = "reference internal" href = "../Components/EvMenu.html" > < span class = "doc std std-doc" > EvMenu< / span > < / a > utility to easily create in-game menus.< / p >
< p > We will store all the merchant’ ‘ ’ < br / >
To enter the shop, you’ < code class = "docutils literal notranslate" > < span class = "pre" > buy/shop< / span > < / code > command.< / p >
< section id = "making-the-merchant-class" >
< h2 > Making the merchant class< a class = "headerlink" href = "#making-the-merchant-class" title = "Permalink to this headline" > ¶< / a > < / h2 >
< p > The merchant will respond to you giving the < code class = "docutils literal notranslate" > < span class = "pre" > shop< / span > < / code > or < code class = "docutils literal notranslate" > < span class = "pre" > buy< / span > < / code > command in their presence.< / p >
< div class = "highlight-python notranslate" > < div class = "highlight" > < pre > < span > < / span > < span class = "c1" > # in for example mygame/typeclasses/merchants.py < / span >
< span class = "kn" > from< / span > < span class = "nn" > typeclasses.objects< / span > < span class = "kn" > import< / span > < span class = "n" > Object< / span >
< span class = "kn" > from< / span > < span class = "nn" > evennia< / span > < span class = "kn" > import< / span > < span class = "n" > Command< / span > < span class = "p" > ,< / span > < span class = "n" > CmdSet< / span > < span class = "p" > ,< / span > < span class = "n" > EvMenu< / span >
< span class = "k" > class< / span > < span class = "nc" > CmdOpenShop< / span > < span class = "p" > (< / span > < span class = "n" > Command< / span > < span class = "p" > ):< / span >
< span class = "w" > < / span > < span class = "sd" > " " " < / span >
< span class = "sd" > Open the shop! < / span >
< span class = "sd" > Usage:< / span >
< span class = "sd" > shop/buy < / span >
< span class = "sd" > " " " < / span >
< span class = "n" > key< / span > < span class = "o" > =< / span > < span class = "s2" > " shop" < / span >
< span class = "n" > aliases< / span > < span class = "o" > =< / span > < span class = "p" > [< / span > < span class = "s2" > " buy" < / span > < span class = "p" > ]< / span >
< span class = "k" > def< / span > < span class = "nf" > func< / span > < span class = "p" > (< / span > < span class = "bp" > self< / span > < span class = "p" > ):< / span >
< span class = "c1" > # this will sit on the Merchant, which is self.obj. < / span >
< span class = "c1" > # the self.caller is the player wanting to buy stuff. < / span >
< span class = "bp" > self< / span > < span class = "o" > .< / span > < span class = "n" > obj< / span > < span class = "o" > .< / span > < span class = "n" > open_shop< / span > < span class = "p" > (< / span > < span class = "bp" > self< / span > < span class = "o" > .< / span > < span class = "n" > caller< / span > < span class = "p" > )< / span >
< span class = "k" > class< / span > < span class = "nc" > MerchantCmdSet< / span > < span class = "p" > (< / span > < span class = "n" > CmdSet< / span > < span class = "p" > ):< / span >
< span class = "k" > def< / span > < span class = "nf" > at_cmdset_creation< / span > < span class = "p" > (< / span > < span class = "bp" > self< / span > < span class = "p" > ):< / span >
< span class = "bp" > self< / span > < span class = "o" > .< / span > < span class = "n" > add< / span > < span class = "p" > (< / span > < span class = "n" > CmdOpenShop< / span > < span class = "p" > ())< / span >
< span class = "k" > class< / span > < span class = "nc" > NPCMerchant< / span > < span class = "p" > (< / span > < span class = "n" > Object< / span > < span class = "p" > ):< / span >
< span class = "k" > def< / span > < span class = "nf" > at_object_creation< / span > < span class = "p" > (< / span > < span class = "bp" > self< / span > < span class = "p" > ):< / span >
< span class = "bp" > self< / span > < span class = "o" > .< / span > < span class = "n" > cmdset< / span > < span class = "o" > .< / span > < span class = "n" > add_default< / span > < span class = "p" > (< / span > < span class = "n" > MerchantCmdSet< / span > < span class = "p" > )< / span >
< span class = "k" > def< / span > < span class = "nf" > open_shop< / span > < span class = "p" > (< / span > < span class = "bp" > self< / span > < span class = "p" > ,< / span > < span class = "n" > shopper< / span > < span class = "p" > ):< / span >
< span class = "n" > menunodes< / span > < span class = "o" > =< / span > < span class = "p" > {}< / span > < span class = "c1" > # TODO! < / span >
< span class = "n" > shopname< / span > < span class = "o" > =< / span > < span class = "bp" > self< / span > < span class = "o" > .< / span > < span class = "n" > db< / span > < span class = "o" > .< / span > < span class = "n" > shopname< / span > < span class = "ow" > or< / span > < span class = "s2" > " The shop" < / span >
< span class = "n" > EvMenu< / span > < span class = "p" > (< / span > < span class = "n" > shopper< / span > < span class = "p" > ,< / span > < span class = "n" > menunodes< / span > < span class = "p" > ,< / span > < span class = "n" > startnode< / span > < span class = "o" > =< / span > < span class = "s2" > " shopfront" < / span > < span class = "p" > ,< / span >
< span class = "n" > shopname< / span > < span class = "o" > =< / span > < span class = "n" > shopname< / span > < span class = "p" > ,< / span > < span class = "n" > shopkeeper< / span > < span class = "o" > =< / span > < span class = "bp" > self< / span > < span class = "p" > ,< / span > < span class = "n" > wares< / span > < span class = "o" > =< / span > < span class = "bp" > self< / span > < span class = "o" > .< / span > < span class = "n" > contents< / span > < span class = "p" > )< / span >
< / pre > < / div >
< / div >
< p > We could also have put the commands in a separate module, but for compactness, we put it all with the merchant typeclass.< / p >
< p > Note that we make the merchant an < code class = "docutils literal notranslate" > < span class = "pre" > Object< / span > < / code > ! Since we don’ < code class = "docutils literal notranslate" > < span class = "pre" > Character< / span > < / code > .< / p >
< p > We make a very simple < code class = "docutils literal notranslate" > < span class = "pre" > shop< / span > < / code > /< code class = "docutils literal notranslate" > < span class = "pre" > buy< / span > < / code > Command and make sure to add it on the merchant in its own cmdset.< / p >
< p > We initialize < code class = "docutils literal notranslate" > < span class = "pre" > EvMenu< / span > < / code > on the < code class = "docutils literal notranslate" > < span class = "pre" > shopper< / span > < / code > but we haven’ < code class = "docutils literal notranslate" > < span class = "pre" > menunodes< / span > < / code > yet, so this will not actually do much at this point. It’ < code class = "docutils literal notranslate" > < span class = "pre" > shopname< / span > < / code > , < code class = "docutils literal notranslate" > < span class = "pre" > shopkeeper< / span > < / code > and < code class = "docutils literal notranslate" > < span class = "pre" > wares< / span > < / code > into the menu, it means they will be made available as properties on the EvMenu instance - we will be able to access them from inside the menu.< / p >
< / section >
< section id = "coding-the-shopping-menu" >
< h2 > Coding the shopping menu< a class = "headerlink" href = "#coding-the-shopping-menu" title = "Permalink to this headline" > ¶< / a > < / h2 >
< p > < a class = "reference internal" href = "../Components/EvMenu.html" > < span class = "doc std std-doc" > EvMenu< / span > < / a > splits the menu into < em > nodes< / em > represented by Python functions. Each node represents a stop in the menu where the user has to make a choice.< / p >
< p > For simplicity, we’ < code class = "docutils literal notranslate" > < span class = "pre" > NPCMerchant< / span > < / code > class in the same module.< / p >
< p > The start node of the shop named “ye Old Sword shop!” will look like this if there are only 3 wares to sell:< / p >
< div class = "highlight-default notranslate" > < div class = "highlight" > < pre > < span > < / span > *** Welcome to ye Old Sword shop! ***
Things for sale (choose 1-3 to inspect, quit to exit):
_________________________________________________________
1. A rusty sword (5 gold)
2. A sword with a leather handle (10 gold)
3. Excalibur (100 gold)
< / pre > < / div >
< / div >
< div class = "highlight-python notranslate" > < div class = "highlight" > < pre > < span > < / span > < span class = "c1" > # in mygame/typeclasses/merchants.py< / span >
< span class = "c1" > # top of module, above NPCMerchant class.< / span >
< span class = "k" > def< / span > < span class = "nf" > node_shopfront< / span > < span class = "p" > (< / span > < span class = "n" > caller< / span > < span class = "p" > ,< / span > < span class = "n" > raw_string< / span > < span class = "p" > ,< / span > < span class = "o" > **< / span > < span class = "n" > kwargs< / span > < span class = "p" > ):< / span >
< span class = "s2" > " This is the top-menu screen." < / span >
< span class = "c1" > # made available since we passed them to EvMenu on start < / span >
< span class = "n" > menu< / span > < span class = "o" > =< / span > < span class = "n" > caller< / span > < span class = "o" > .< / span > < span class = "n" > ndb< / span > < span class = "o" > .< / span > < span class = "n" > _evmenu< / span >
< span class = "n" > shopname< / span > < span class = "o" > =< / span > < span class = "n" > menu< / span > < span class = "o" > .< / span > < span class = "n" > shopname< / span >
< span class = "n" > shopkeeper< / span > < span class = "o" > =< / span > < span class = "n" > menu< / span > < span class = "o" > .< / span > < span class = "n" > shopkeeper< / span >
< span class = "n" > wares< / span > < span class = "o" > =< / span > < span class = "n" > menu< / span > < span class = "o" > .< / span > < span class = "n" > wares< / span >
< span class = "n" > text< / span > < span class = "o" > =< / span > < span class = "sa" > f< / span > < span class = "s2" > " *** Welcome to < / span > < span class = "si" > {< / span > < span class = "n" > shopname< / span > < span class = "si" > }< / span > < span class = "s2" > ! ***< / span > < span class = "se" > \n< / span > < span class = "s2" > " < / span >
< span class = "k" > if< / span > < span class = "n" > wares< / span > < span class = "p" > :< / span >
< span class = "n" > text< / span > < span class = "o" > +=< / span > < span class = "sa" > f< / span > < span class = "s2" > " Things for sale (choose 1-< / span > < span class = "si" > {< / span > < span class = "nb" > len< / span > < span class = "p" > (< / span > < span class = "n" > wares< / span > < span class = "p" > )< / span > < span class = "si" > }< / span > < span class = "s2" > to inspect); quit to exit:" < / span >
< span class = "k" > else< / span > < span class = "p" > :< / span >
< span class = "n" > text< / span > < span class = "o" > +=< / span > < span class = "s2" > " There is nothing for sale; quit to exit." < / span >
< span class = "n" > options< / span > < span class = "o" > =< / span > < span class = "p" > []< / span >
< span class = "k" > for< / span > < span class = "n" > ware< / span > < span class = "ow" > in< / span > < span class = "n" > wares< / span > < span class = "p" > :< / span >
< span class = "c1" > # add an option for every ware in store< / span >
< span class = "n" > gold_val< / span > < span class = "o" > =< / span > < span class = "n" > ware< / span > < span class = "o" > .< / span > < span class = "n" > db< / span > < span class = "o" > .< / span > < span class = "n" > gold_value< / span > < span class = "ow" > or< / span > < span class = "mi" > 1< / span >
< span class = "n" > options< / span > < span class = "o" > .< / span > < span class = "n" > append< / span > < span class = "p" > ({< / span > < span class = "s2" > " desc" < / span > < span class = "p" > :< / span > < span class = "sa" > f< / span > < span class = "s2" > " < / span > < span class = "si" > {< / span > < span class = "n" > ware< / span > < span class = "o" > .< / span > < span class = "n" > key< / span > < span class = "si" > }< / span > < span class = "s2" > (< / span > < span class = "si" > {< / span > < span class = "n" > gold_val< / span > < span class = "si" > }< / span > < span class = "s2" > gold)" < / span > < span class = "p" > ,< / span >
< span class = "s2" > " goto" < / span > < span class = "p" > :< / span > < span class = "p" > (< / span > < span class = "s2" > " inspect_and_buy" < / span > < span class = "p" > ,< / span >
< span class = "p" > {< / span > < span class = "s2" > " selected_ware" < / span > < span class = "p" > :< / span > < span class = "n" > ware< / span > < span class = "p" > })< / span >
< span class = "p" > })< / span >
< span class = "k" > return< / span > < span class = "n" > text< / span > < span class = "p" > ,< / span > < span class = "n" > options< / span >
< / pre > < / div >
< / div >
< p > Inside the node we can access the menu on the caller as < code class = "docutils literal notranslate" > < span class = "pre" > caller.ndb._evmenu< / span > < / code > . The extra keywords we passed into < code class = "docutils literal notranslate" > < span class = "pre" > EvMenu< / span > < / code > are available on this menu instance. Armed with this we can easily present a shop interface. Each option will become a numbered choice on this screen.< / p >
< p > Note how we pass the < code class = "docutils literal notranslate" > < span class = "pre" > ware< / span > < / code > with each option and label it < code class = "docutils literal notranslate" > < span class = "pre" > selected_ware< / span > < / code > . This will be accessible in the next node’ < code class = "docutils literal notranslate" > < span class = "pre" > **kwargs< / span > < / code > argument< / p >
< p > If a player choose one of the wares, they should be able to inspect it. Here’ < code class = "docutils literal notranslate" > < span class = "pre" > 1< / span > < / code > in ye Old Sword shop:< / p >
< div class = "highlight-default notranslate" > < div class = "highlight" > < pre > < span > < / span > < span class = "n" > You< / span > < span class = "n" > inspect< / span > < span class = "n" > A< / span > < span class = "n" > rusty< / span > < span class = "n" > sword< / span > < span class = "p" > :< / span >
< span class = "n" > This< / span > < span class = "ow" > is< / span > < span class = "n" > an< / span > < span class = "n" > old< / span > < span class = "n" > weapon< / span > < span class = "n" > maybe< / span > < span class = "n" > once< / span > < span class = "n" > used< / span > < span class = "n" > by< / span > < span class = "n" > soldiers< / span > < span class = "ow" > in< / span > < span class = "n" > some< / span >
< span class = "n" > long< / span > < span class = "n" > forgotten< / span > < span class = "n" > army< / span > < span class = "o" > .< / span > < span class = "n" > It< / span > < span class = "ow" > is< / span > < span class = "n" > rusty< / span > < span class = "ow" > and< / span > < span class = "ow" > in< / span > < span class = "n" > bad< / span > < span class = "n" > condition< / span > < span class = "o" > .< / span >
< span class = "n" > __________________________________________________________< / span >
< span class = "mf" > 1.< / span > < span class = "n" > Buy< / span > < span class = "n" > A< / span > < span class = "n" > rusty< / span > < span class = "n" > sword< / span > < span class = "p" > (< / span > < span class = "mi" > 5< / span > < span class = "n" > gold< / span > < span class = "p" > )< / span >
< span class = "mf" > 2.< / span > < span class = "n" > Look< / span > < span class = "k" > for< / span > < span class = "n" > something< / span > < span class = "k" > else< / span > < span class = "o" > .< / span >
< / pre > < / div >
< / div >
< p > If you buy, you’ < / p >
< div class = "highlight-default notranslate" > < div class = "highlight" > < pre > < span > < / span > You pay 5 gold and purchase A rusty sword!
< / pre > < / div >
< / div >
< p > or< / p >
< div class = "highlight-default notranslate" > < div class = "highlight" > < pre > < span > < / span > You cannot afford 5 gold for A rusty sword!
< / pre > < / div >
< / div >
< p > Either way you should end up back at the top level of the shopping menu again and can continue browsing or quit the menu with < code class = "docutils literal notranslate" > < span class = "pre" > quit< / span > < / code > .< / p >
< p > Here’ < / p >
< div class = "highlight-python notranslate" > < div class = "highlight" > < pre > < span > < / span > < span class = "c1" > # in mygame/typeclasses/merchants.py < / span >
< span class = "c1" > # right after the other node< / span >
< span class = "k" > def< / span > < span class = "nf" > _buy_item< / span > < span class = "p" > (< / span > < span class = "n" > caller< / span > < span class = "p" > ,< / span > < span class = "n" > raw_string< / span > < span class = "p" > ,< / span > < span class = "o" > **< / span > < span class = "n" > kwargs< / span > < span class = "p" > ):< / span >
< span class = "s2" > " Called if buyer chooses to buy" < / span >
< span class = "n" > selected_ware< / span > < span class = "o" > =< / span > < span class = "n" > kwargs< / span > < span class = "p" > [< / span > < span class = "s2" > " selected_ware" < / span > < span class = "p" > ]< / span >
< span class = "n" > value< / span > < span class = "o" > =< / span > < span class = "n" > selected_ware< / span > < span class = "o" > .< / span > < span class = "n" > db< / span > < span class = "o" > .< / span > < span class = "n" > gold_value< / span > < span class = "ow" > or< / span > < span class = "mi" > 1< / span >
< span class = "n" > wealth< / span > < span class = "o" > =< / span > < span class = "n" > caller< / span > < span class = "o" > .< / span > < span class = "n" > db< / span > < span class = "o" > .< / span > < span class = "n" > gold< / span > < span class = "ow" > or< / span > < span class = "mi" > 0< / span >
< span class = "k" > if< / span > < span class = "n" > wealth< / span > < span class = "o" > > =< / span > < span class = "n" > value< / span > < span class = "p" > :< / span >
< span class = "n" > rtext< / span > < span class = "o" > =< / span > < span class = "sa" > f< / span > < span class = "s2" > " You pay < / span > < span class = "si" > {< / span > < span class = "n" > value< / span > < span class = "si" > }< / span > < span class = "s2" > gold and purchase < / span > < span class = "si" > {< / span > < span class = "n" > ware< / span > < span class = "o" > .< / span > < span class = "n" > key< / span > < span class = "si" > }< / span > < span class = "s2" > !" < / span >
< span class = "n" > caller< / span > < span class = "o" > .< / span > < span class = "n" > db< / span > < span class = "o" > .< / span > < span class = "n" > gold< / span > < span class = "o" > -=< / span > < span class = "n" > value< / span >
< span class = "n" > move_to< / span > < span class = "p" > (< / span > < span class = "n" > caller< / span > < span class = "p" > ,< / span > < span class = "n" > quiet< / span > < span class = "o" > =< / span > < span class = "kc" > True< / span > < span class = "p" > ,< / span > < span class = "n" > move_type< / span > < span class = "o" > =< / span > < span class = "s2" > " buy" < / span > < span class = "p" > )< / span >
< span class = "k" > else< / span > < span class = "p" > :< / span >
< span class = "n" > rtext< / span > < span class = "o" > =< / span > < span class = "sa" > f< / span > < span class = "s2" > " You cannot afford < / span > < span class = "si" > {< / span > < span class = "n" > value< / span > < span class = "si" > }< / span > < span class = "s2" > gold for < / span > < span class = "si" > {< / span > < span class = "n" > ware< / span > < span class = "o" > .< / span > < span class = "n" > key< / span > < span class = "si" > }< / span > < span class = "s2" > !" < / span >
< span class = "n" > caller< / span > < span class = "o" > .< / span > < span class = "n" > msg< / span > < span class = "p" > (< / span > < span class = "n" > rtext< / span > < span class = "p" > )< / span >
< span class = "c1" > # no matter what, we return to the top level of the shop< / span >
< span class = "k" > return< / span > < span class = "s2" > " shopfront" < / span >
< span class = "k" > def< / span > < span class = "nf" > node_inspect_and_buy< / span > < span class = "p" > (< / span > < span class = "n" > caller< / span > < span class = "p" > ,< / span > < span class = "n" > raw_string< / span > < span class = "p" > ,< / span > < span class = "o" > **< / span > < span class = "n" > kwargs< / span > < span class = "p" > ):< / span >
< span class = "s2" > " Sets up the buy menu screen." < / span >
< span class = "c1" > # passed from the option we chose < / span >
< span class = "n" > selected_ware< / span > < span class = "o" > =< / span > < span class = "n" > kwargs< / span > < span class = "p" > [< / span > < span class = "s2" > " selected_ware" < / span > < span class = "p" > ]< / span >
< span class = "n" > value< / span > < span class = "o" > =< / span > < span class = "n" > selected_ware< / span > < span class = "o" > .< / span > < span class = "n" > db< / span > < span class = "o" > .< / span > < span class = "n" > gold_value< / span > < span class = "ow" > or< / span > < span class = "mi" > 1< / span >
< span class = "n" > text< / span > < span class = "o" > =< / span > < span class = "sa" > f< / span > < span class = "s2" > " You inspect < / span > < span class = "si" > {< / span > < span class = "n" > ware< / span > < span class = "o" > .< / span > < span class = "n" > key< / span > < span class = "si" > }< / span > < span class = "s2" > :< / span > < span class = "se" > \n\n< / span > < span class = "si" > {< / span > < span class = "n" > ware< / span > < span class = "o" > .< / span > < span class = "n" > db< / span > < span class = "o" > .< / span > < span class = "n" > desc< / span > < span class = "si" > }< / span > < span class = "s2" > " < / span >
< span class = "n" > gold_val< / span > < span class = "o" > =< / span > < span class = "n" > ware< / span > < span class = "o" > .< / span > < span class = "n" > db< / span > < span class = "o" > .< / span > < span class = "n" > gold_value< / span > < span class = "ow" > or< / span > < span class = "mi" > 1< / span >
< span class = "n" > options< / span > < span class = "o" > =< / span > < span class = "p" > ({< / span >
< span class = "s2" > " desc" < / span > < span class = "p" > :< / span > < span class = "sa" > f< / span > < span class = "s2" > " Buy < / span > < span class = "si" > {< / span > < span class = "n" > ware< / span > < span class = "o" > .< / span > < span class = "n" > key< / span > < span class = "si" > }< / span > < span class = "s2" > for < / span > < span class = "si" > {< / span > < span class = "n" > gold_val< / span > < span class = "si" > }< / span > < span class = "s2" > gold" < / span > < span class = "p" > ,< / span >
< span class = "s2" > " goto" < / span > < span class = "p" > :< / span > < span class = "p" > (< / span > < span class = "n" > _buy_item< / span > < span class = "p" > ,< / span > < span class = "n" > kwargs< / span > < span class = "p" > )< / span >
< span class = "p" > },< / span > < span class = "p" > {< / span >
< span class = "s2" > " desc" < / span > < span class = "p" > :< / span > < span class = "s2" > " Look for something else" < / span > < span class = "p" > ,< / span >
< span class = "s2" > " goto" < / span > < span class = "p" > :< / span > < span class = "s2" > " shopfront" < / span > < span class = "p" > ,< / span >
< span class = "p" > })< / span >
< span class = "k" > return< / span > < span class = "n" > text< / span > < span class = "p" > ,< / span > < span class = "n" > options< / span >
< / pre > < / div >
< / div >
< p > In this node we grab the < code class = "docutils literal notranslate" > < span class = "pre" > selected_ware< / span > < / code > from < code class = "docutils literal notranslate" > < span class = "pre" > kwargs< / span > < / code > - this we pased along from the option on the previous node. We display its description and value. If the user buys, we reroute through the < code class = "docutils literal notranslate" > < span class = "pre" > _buy_item< / span > < / code > helper function (this is not a node, it’ < code class = "docutils literal notranslate" > < span class = "pre" > _buy_item< / span > < / code > we check if the buyer can affort the ware, and if it can we move it to their inventory. Either way, this method returns < code class = "docutils literal notranslate" > < span class = "pre" > shop_front< / span > < / code > as the next node.< / p >
< p > We have been referring to two nodes here: < code class = "docutils literal notranslate" > < span class = "pre" > " shopfront" < / span > < / code > and < code class = "docutils literal notranslate" > < span class = "pre" > " inspect_and_buy" < / span > < / code > , we should map them to the code in the menu. Scroll down to the < code class = "docutils literal notranslate" > < span class = "pre" > NPCMerchant< / span > < / code > class in the same module and find that unfinished < code class = "docutils literal notranslate" > < span class = "pre" > open_shop< / span > < / code > method again:< / p >
< div class = "highlight-python notranslate" > < div class = "highlight" > < pre > < span > < / span > < span class = "c1" > # in /mygame/typeclasses/merchants.py< / span >
< span class = "k" > def< / span > < span class = "nf" > node_shopfront< / span > < span class = "p" > (< / span > < span class = "n" > caller< / span > < span class = "p" > ,< / span > < span class = "n" > raw_string< / span > < span class = "p" > ,< / span > < span class = "o" > **< / span > < span class = "n" > kwargs< / span > < span class = "p" > ):< / span >
< span class = "c1" > # ... < / span >
< span class = "k" > def< / span > < span class = "nf" > _buy_item< / span > < span class = "p" > (< / span > < span class = "n" > caller< / span > < span class = "p" > ,< / span > < span class = "n" > raw_string< / span > < span class = "p" > ,< / span > < span class = "o" > **< / span > < span class = "n" > kwargs< / span > < span class = "p" > ):< / span >
< span class = "c1" > # ...< / span >
< span class = "k" > def< / span > < span class = "nf" > node_inspect_and_buy< / span > < span class = "p" > (< / span > < span class = "n" > caller< / span > < span class = "p" > ,< / span > < span class = "n" > raw_string< / span > < span class = "p" > ,< / span > < span class = "o" > **< / span > < span class = "n" > kwargs< / span > < span class = "p" > ):< / span >
< span class = "c1" > # ... < / span >
< span class = "k" > class< / span > < span class = "nc" > NPCMerchant< / span > < span class = "p" > (< / span > < span class = "n" > Object< / span > < span class = "p" > ):< / span >
< span class = "c1" > # ...< / span >
< span class = "k" > def< / span > < span class = "nf" > open_shop< / span > < span class = "p" > (< / span > < span class = "bp" > self< / span > < span class = "p" > ,< / span > < span class = "n" > shopper< / span > < span class = "p" > ):< / span >
< span class = "n" > menunodes< / span > < span class = "o" > =< / span > < span class = "p" > {< / span >
< span class = "s2" > " shopfront" < / span > < span class = "p" > :< / span > < span class = "n" > node_shopfront< / span > < span class = "p" > ,< / span >
< span class = "s2" > " inspect_and_buy" < / span > < span class = "p" > :< / span > < span class = "n" > node_inspect_and_buy< / span >
< span class = "p" > }< / span >
< span class = "n" > shopname< / span > < span class = "o" > =< / span > < span class = "bp" > self< / span > < span class = "o" > .< / span > < span class = "n" > db< / span > < span class = "o" > .< / span > < span class = "n" > shopname< / span > < span class = "ow" > or< / span > < span class = "s2" > " The shop" < / span >
< span class = "n" > EvMenu< / span > < span class = "p" > (< / span > < span class = "n" > shopper< / span > < span class = "p" > ,< / span > < span class = "n" > menunodes< / span > < span class = "p" > ,< / span > < span class = "n" > startnode< / span > < span class = "o" > =< / span > < span class = "s2" > " shopfront" < / span > < span class = "p" > ,< / span >
< span class = "n" > shopname< / span > < span class = "o" > =< / span > < span class = "n" > shopname< / span > < span class = "p" > ,< / span > < span class = "n" > shopkeeper< / span > < span class = "o" > =< / span > < span class = "bp" > self< / span > < span class = "p" > ,< / span > < span class = "n" > wares< / span > < span class = "o" > =< / span > < span class = "bp" > self< / span > < span class = "o" > .< / span > < span class = "n" > contents< / span > < span class = "p" > )< / span >
< / pre > < / div >
< / div >
< p > We now added the nodes to the Evmenu under their right labels. The merchant is now ready!< / p >
< / section >
< section id = "the-shop-is-open-for-business" >
< h2 > The shop is open for business!< a class = "headerlink" href = "#the-shop-is-open-for-business" title = "Permalink to this headline" > ¶< / a > < / h2 >
< p > Make sure to < code class = "docutils literal notranslate" > < span class = "pre" > reload< / span > < / code > .< / p >
< p > Let’ < / p >
< div class = "highlight-default notranslate" > < div class = "highlight" > < pre > < span > < / span > < span class = "o" > > < / span > < span class = "nb" > set< / span > < span class = "bp" > self< / span > < span class = "o" > /< / span > < span class = "n" > gold< / span > < span class = "o" > =< / span > < span class = "mi" > 8< / span >
< span class = "o" > > < / span > < span class = "n" > create< / span > < span class = "o" > /< / span > < span class = "n" > drop< / span > < span class = "n" > Stan< / span > < span class = "n" > S< / span > < span class = "o" > .< / span > < span class = "n" > Stanman< / span > < span class = "p" > ;< / span > < span class = "n" > stan< / span > < span class = "p" > :< / span > < span class = "n" > typeclasses< / span > < span class = "o" > .< / span > < span class = "n" > merchants< / span > < span class = "o" > .< / span > < span class = "n" > NPCMerchant< / span >
< span class = "o" > > < / span > < span class = "nb" > set< / span > < span class = "n" > stan< / span > < span class = "o" > /< / span > < span class = "n" > shopname< / span > < span class = "o" > =< / span > < span class = "n" > Stan< / span > < span class = "s1" > ' s previously owned vessles< / span >
< span class = "o" > > < / span > < span class = "n" > create< / span > < span class = "o" > /< / span > < span class = "n" > drop< / span > < span class = "n" > A< / span > < span class = "n" > proud< / span > < span class = "n" > vessel< / span > < span class = "p" > ;< / span > < span class = "n" > ship< / span >
< span class = "o" > > < / span > < span class = "nb" > set< / span > < span class = "n" > ship< / span > < span class = "o" > /< / span > < span class = "n" > desc< / span > < span class = "o" > =< / span > < span class = "n" > The< / span > < span class = "n" > thing< / span > < span class = "n" > has< / span > < span class = "n" > holes< / span > < span class = "ow" > in< / span > < span class = "n" > it< / span > < span class = "o" > .< / span >
< span class = "o" > > < / span > < span class = "nb" > set< / span > < span class = "n" > ship< / span > < span class = "o" > /< / span > < span class = "n" > gold_value< / span > < span class = "o" > =< / span > < span class = "mi" > 5< / span >
< span class = "o" > > < / span > < span class = "n" > create< / span > < span class = "o" > /< / span > < span class = "n" > drop< / span > < span class = "n" > A< / span > < span class = "n" > classic< / span > < span class = "n" > speedster< / span > < span class = "p" > ;< / span > < span class = "n" > rowboat< / span >
< span class = "o" > > < / span > < span class = "nb" > set< / span > < span class = "n" > rowboat< / span > < span class = "o" > /< / span > < span class = "n" > gold_value< / span > < span class = "o" > =< / span > < span class = "mi" > 2< / span >
< span class = "o" > > < / span > < span class = "nb" > set< / span > < span class = "n" > rowboat< / span > < span class = "o" > /< / span > < span class = "n" > desc< / span > < span class = "o" > =< / span > < span class = "n" > It< / span > < span class = "s1" > ' s not going anywhere fast.< / span >
< / pre > < / div >
< / div >
< p > Note that a builder without any access to Python code can now set up a personalized merchant with just in-game commands. With the shop all set up, we just need to be in the same room to start consuming!< / p >
< div class = "highlight-default notranslate" > < div class = "highlight" > < pre > < span > < / span > > buy
*** Welcome to Stan' s previously owned vessels! ***
Things for sale (choose 1-3 to inspect, quit to exit):
_________________________________________________________
1. A proud vessel (5 gold)
2. A classic speedster (2 gold)
> 1
You inspect A proud vessel:
The thing has holes in it.
__________________________________________________________
1. Buy A proud vessel (5 gold)
2. Look for something else.
> 1
You pay 5 gold and purchase A proud vessel!
*** Welcome to Stan' s previously owned vessels! ***
Things for sale (choose 1-3 to inspect, quit to exit):
_________________________________________________________
1. A classic speedster (2 gold)
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