Python:无法连接 'str' 和 'int' 对象错误

Question

我正在尝试创建一个小程序，让用户可以从商店购买东西或用钱购买工作。

代码:

#Info before user starts

print "Enter job, shop, or exit"
print ""

#--------------------------------------------------------------------------------------------
#Variabls

name = raw_input("What is your name?")
ask = raw_input("Where do you want to go:")
currency = 20

#--------------------------------------------------------------------------------------------
#Functions

def job():
  print "hello"

def shop():
  print "Hello " + name + ", what would you like? You have $" + currency

#-------------------------------------------------------------------------------------------
#Body

while (ask != "job") and (ask != "shop") and (ask != "exit"):
  print "That is not an option. Please choose job, shop, or exit"
  ask = raw_input("Where do you want to go:")

if(ask == "job"):
  job()
elif (ask == "shop"):
  shop()

程序会询问用户的姓名并询问他想去哪里。对于功能商店，程序应打印:“嗨[用户名]，您想要什么？您有 20 美元”。当我运行它时，它显示以下错误:

Traceback (most recent call last):
  File "python", line 30, in <module>
  File "python", line 18, in shop
TypeError: cannot concatenate 'str' and 'int' objects

谁能解释一下发生了什么？

Answer 1

使用 str 函数将“货币”转换为字符串

def shop():
      print "Hello " + name + ", what would you like? You have $" + str(currency)