为什么Python在字符串中返回一个转义反斜杠？

Question

'\"atg is a codon, isn\'t it?\" \"Yes, it is\", he answered'

作为输出：

'"atg is a codon, isn\'t it?" "Yes, it is", he answered'

为什么转义符出现在输出中？

当我输入下面的字符串时，这不会发生。

'This is a codon, isn\'t it?'

我得到的输出是：

"This is a codon, isn't it?"

Answer 1

因为在第一个字符串中，整个字符串在一个引号中，因此应该转义另一个单引号。而在第二个中，整个字符串是双引号。

>>> '\"atg is a codon, isn\'t it?\" \"Yes, it is\", he answered'
'"atg is a codon, isn\'t it?" "Yes, it is", he answered'
^                                                      ^
>>> 
>>> 'This is a codon, isn\'t it?'
"This is a codon, isn't it?"  # there is no need to escape the one-quote between double-quotes         
^                          ^

Answer 2

需要转义字符，因为这是一个字符串，如果确切地输入，则会重现字符串。该字符串包含单引号和双引号，因此包含该字符串的任何类型都需要在字符串中进行转义。

Answer 3

您可以选择单引号或双引号来包含字符串。必须使用'\'转义任何出现的封闭引号字符。

>>> b = 'Hello\'s'
>>> a = "Hello's"
>>> b = 'Hello\'s'
>>> c = 'Hello"s'
>>> d = "Hello\"s"
>>> a
"Hello's"
>>> b
"Hello's"
>>> c
'Hello"s'
>>> d
'Hello"s'
>>>