錯誤與字符串結尾反斜槓

Question

Possible Duplicate:
why can’t I end a raw string with a \

這是爲什麼語法正確：

baseFilePath = r"C:\SVN\google code" 

，而這給了錯誤

baseFilePath = r"C:\SVN\google code\" 

SyntaxError: EOL while scanning string literal

Answer 1

在第二種情況下，你都逃脫報價\"是的轉義序列210

要使用反斜槓，你應該使用一個雙反斜線\\

這應該工作：

baseFilePath = "C:\\SVN\\google code\\" 

>>> print(baseFilePath) 
    C:\SVN\google code\ 

Answer 2

這裏，反斜槓結束"。
如果你想在一個字符串中使用\，最安全的方法是轉義反斜槓本身。

試試這個：

baseFilePath = "C:\\SVN\\google code\\" 

我推薦它，而不是使用原始字符串。 python doc中描述了需要轉義的字符。

Answer 3

Fromt的docs：

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.

具體而言，原始字符串在 單反斜線不能結束（因爲反斜槓將難逃以下引號 字符）

Answer 4

使用os.path.join，它避免了這和照顧使用操作系統相應的目錄分隔符：

>>> import os 
>>> os.path.join('C:','svn','google code') 
'C:/svn/google code'