在python中的字符串之前'r'代表什么？
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What does an 'r' represent before a string in python?
提问by Rahul
I want to understand why do we use a r before a path name in python such as
我想了解为什么我们在 python 中的路径名之前使用 ar，例如
dirname = r'C:\temp\parts'
回答by Rahul Tripathi
r means the string will be treated as raw string.
r 表示字符串将被视为原始字符串。
From here:
从这里：
When an 'r' or 'R' prefix is present, a character following a backslash is included in the string without change, and all backslashes are left in the string. For example, the string literal r"\n" consists of two characters: a backslash and a lowercase 'n'. String quotes can be escaped with a backslash, but the backslash remains in the string; for example, r"\"" is a valid string literal consisting of two characters: a backslash and a double quote; r"\" is not a valid string literal (even a raw string cannot end in an odd number of backslashes). Specifically, a raw string cannot end in a single backslash (since the backslash would escape the following quote character). Note also that a single backslash followed by a newline is interpreted as those two characters as part of the string, not as a line continuation.
当存在 'r' 或 'R' 前缀时，反斜杠后面的字符将包含在字符串中而不会更改，并且所有反斜杠都保留在字符串中。例如，字符串文字 r"\n" 由两个字符组成：一个反斜杠和一个小写的 'n'。字符串引号可以用反斜杠转义，但反斜杠保留在字符串中；例如，r"\"" 是由两个字符组成的有效字符串文字：反斜杠和双引号；r"\" 不是有效的字符串文字（即使原始字符串也不能以奇数个反斜杠结尾）。具体来说，原始字符串不能以单个反斜杠结尾（因为反斜杠会转义后面的引号字符）。
