Python 将变量放入字符串中（引用）
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Putting a variable into a string (quote)
提问by Tim
Help I can't get this to work, I am trying to put the variable age into the string but it won't load the variable properly.
帮助 我无法让它工作，我试图将变量 age 放入字符串中，但它无法正确加载变量。
Here is my code:
这是我的代码：
import random
import sys
import os
age = 17
print(age)
quote = "You are" age "years old!"
Gives this error:
给出这个错误：
File "C:/Users/----/PycharmProjects/hellophyton/hellophyton.py", line 9
quote = "You are" age "years old!"
^
SyntaxError: invalid syntax
Process finished with exit code 1
回答by Pythonista
You should use a string formatter here, or concatenation. For concatenation you'll have to convert an intto a string. You can't concatenate ints and strings together.
您应该在此处使用字符串格式化程序或连接。对于串联，您必须将 an 转换int为 a string。您不能将整数和字符串连接在一起。
This will raise the following error should you try:
如果您尝试，这将引发以下错误：
TypeError: unsupported operand type(s) for +: 'int' and 'str'
Formatting:
格式化：
quote = "You are %d years old" % age
quote = "You are {} years old".format(age)
Concatenation (one way)
串联（一种方式）
quote = "You are " + str(age) + " years old"
Edit: As noted by J.F. Sebastian in the comment(s) we can also do the following
编辑：正如 JF Sebastian 在评论中所指出的，我们还可以执行以下操作
In Python 3.6:
在 Python 3.6 中：
f"You are {age} years old"
Earlier versions of Python:
早期版本的 Python：
"You are {age} years old".format(**vars())
回答by Joe T. Boka
This is one way to do it:
这是一种方法：
>>> age = 17
>>> quote = "You are %d years old!" % age
>>> quote
'You are 17 years old!'
>>>
回答by gr1zzly be4r
You need to use the +sign to insert it into the string like this:
您需要使用该+符号将其插入字符串中，如下所示：
quote = "You are " + age + " years old!"
You can read more about other ways of doing this on Python's string documentation.
您可以在Python 的字符串文档 中阅读更多有关执行此操作的其他方法的信息。
