何时使用三重单引号而不是三重双引号 [英] When to use triple single quotes instead of triple double quotes

问题描述

艰难地学习 Python，练习 10.2:

Learn Python the hard way, exercise 10.2:

tabby_cat = "\tI'm tabbed in."
persian_cat = "I'm split\non a line."
backslash_cat = "I'm \\ a \\ cat."

fat_cat = """
I'll do a list:
\t* Cat food
\t* Fishies
\t* Catnip\n\t* Grass
"""

print tabby_cat
print persian_cat
print backslash_cat
print fat_cat

2:使用 '''(三重单引号)代替.你能明白为什么你可以使用它而不是 """ 吗?

2: Use ''' (triple-single-quote) instead. Can you see why you might use that instead of """?

我不明白为什么我可以使用 ''' 而不是 """.它给了我相同的输出.有人可以解释我为什么要使用三重单引号而不是三重双引号?它们有什么区别?

I can't see why I might use ''' instead of """. It gives me the same output. Can someone explain me why I would use triple-single-quote instead of triple-double-quote? What's the difference between them?

推荐答案

您可能需要 """ 而不是 ''' 的唯一原因(反之亦然)是如果字符串本身包含三重引号.

The only reason you might need """ instead of ''' (or vice versa) is if the string itself contains a triple quote.

s1 = '''This string contains """ so use triple-single-quotes.'''
s2 = """This string contains ''' so use triple-double-quotes."""

如果一个字符串同时包含三重单引号和三重双引号，那么您将不得不转义其中一个，但这种情况极为罕见.

If a string contains both triple-single-quotes and triple-double-quotes then you will have to escape one of them, but this is an extremely rare situation.

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