Question

如果这令人困惑，我很抱歉，我是Python和这个网站的新手，可以使用一些帮助。我希望我清楚我正在努力寻求帮助。当我尝试打印两个用户输入时，输入食物名称后会出现错误。我做错了什么？

foodname=input('please enter food name.') # I ask the user for the name of their food
foodcost=input('please enter food cost.') # I ask for the cost of the same food
print foodname, foodcost #I print both of the given inputs

以下是错误消息：

Traceback (most recent call last): 
File "C:/Python27/test.py", line 1, in <module> foodname=input('please enter food name.') 
File "<string>", line 1, in <module> NameError: name 'cheese' is not defined >>>

Answer 1

python 2.7和3之间的输入和打印语法略有不同。在2.7 input中评估数据，而raw_input将其作为字符串读取。在3.x input中，将数据读入为字符串。 print在2.7中不需要括号，但在3.x中需要它们

Python 2.7

foodname=raw_input('please enter food name.') # raw_input returns a string
foodcost=int(raw_input('please enter food cost.')) # read as string cast to int
print foodname, foodcost

Python 3.x

foodname=input('please enter food name.') # Input returns a string
foodcost=int(input('please enter food cost.')) 
print(foodname, foodcost) # add brackets to print

打印用户输入字符串

1 个答案: