add wallet balance recipes

recipes/3.WalletBalance/README.rst

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+This are basic examples how to get the wallet balance
+
+wallet_steamclient.py
+---------------------
+
+This first script is very basic.
+Prompts for loging, handles code prompts and prints wallet balalnce.
+Since there is no handling for the result of ``cli_login`` during
+this might break in certain situations like when Steam is down.
+
+wallet_webauth.py
+-----------------
+
+This script is a little bit more complicated and instead logs in to the steam website.
+Once logged in to the website, it requests a single page and finds the balance in the source code.
+There is basic structure to handle code prompts.
+Entering username, password or codes wrong will result in an error as there is na ologic to handle that.

recipes/3.WalletBalance/wallet_steamclient.py

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+from steam.client import SteamClient, EMsg
+from steam.enums import EResult, ECurrencyCode
+
+client = SteamClient()
+
+@client.on(EMsg.ClientWalletInfoUpdate)
+def print_balance(msg):
+    bucks, cents = divmod(msg.body.balance64, 100)
+    print("Current balance is {:d}.{:02d} {:s}".format(bucks,
+                                                       cents,
+                                                       ECurrencyCode(msg.body.currency).name
+                                                       ))
+
+client.cli_login()
+client.disconnect()

recipes/3.WalletBalance/wallet_webauth.py

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+import re
+from getpass import getpass
+import steam.webauth as wa
+
+try:
+    user_input = raw_input
+except NameError:
+    user_input = input
+
+username = user_input("Username: ")
+password = getpass("Password: ")
+
+webclient = wa.WebAuth(username, password)
+
+try:
+    webclient.login()
+except wa.CaptchaRequired:
+    print("Captcha:" + webclient.captcha_url)
+    webclient.login(captcha=user_input("Captcha code: "))
+except wa.EmailCodeRequired:
+    webclient.login(email_code=user_input("Email code: "))
+except wa.TwoFactorCodeRequired:
+    webclient.login(twofactor_code=user_input("2FA code: "))
+
+if webclient.complete:
+    resp = webclient.session.get('https://store.steampowered.com/account/store_transactions/')
+    resp.raise_for_status()
+    balance = re.search(r'store_transactions/">(?P<balance>.*?)</a>', resp.text).group('balance')
+    print("Current balance: %s" % balance)