Python 无法识别 Windows 上包含回车的文件名

Question

I would like to select a file, but the filename contains a carriage return and so .isfile() constantly returns False . While when I use .fnmatch() it prints the filename including the trailing carriage return .

import fnmatch
import os
local_path = 'd:'+os.sep
filename = '1F80813965EDAA4FC5BA44A91E0DBFF1'
local_file = os.path.join(local_path, filename+'\r')

print( os.path.isfile(local_file) ) 
# Returns False

for file in os.listdir(local_path):
    if fnmatch.fnmatch(file, filename+'?'):
        print(repr(file)) 
        # Returns 'd:\\1F80813965EDAA4FC5BA44A91E0DBFF1\r'

What is the problem here? Is it Windows? Is it the NTFS partition? Or does the os.path.join() function not understand '\\r' ?

Answer 1

Windows doesn't allow special characters in filename :

[...]

• Use a backslash (\\) to separate the components of a path . The backslash divides the file name from the path to it, and one directory name from another directory name in a path. You cannot use a backslash in the name for the actual file or directory because it is a reserved character that separates the names into components.

[...]

• Use any character in the current code page for a name, including Unicode characters and characters in the extended character set (128–255), except for the following:
  • The following reserved characters:
    • < (less than)
    • > greater than)
    • : (colon)
    • " (double quote)
    • / (forward slash)
    • \\ (backslash)
    • | (vertical bar or pipe)
    • ? (question mark)
    • * (asterisk)
  • Integer value zero, sometimes referred to as the ASCII NUL character.
  • Characters whose integer representations are in the range from 1 through 31, except for alternate data streams where these characters are allowed. For more information about file streams, see File Streams .
  • Any other character that the target file system does not allow.

If you copied the file from another system, this may be a problem. If you need to use this file in Windows, you would probably need to rename it before copying.

Answer 2

In your code, the following line is creating a path to file. You can try to remove \\r in it.

local_file = os.path.join(local_path, filename)