问题
So what I'm trying to do is to join something in the form of
os.path.join('C:\path\to\folder', 'filename').
**edit : Actual code is :
filename = 'creepy_%s.pcl' % identifier
file = open(os.path.join(self.cache_dir, filename), 'w')
where self.cache_dir is read from a file using configobj (returns string) and in the particular case is '\Documents and Settings\Administrator\creepy\cache'
The first part is returned from a configuration file, using configobj. The second is a concatenation of 2 strings like: 'file%s' % name
When I run the application through the console in windows using the python interpreter installed, I get the expected result which is
C:\\path\\to\\folder\\filename
When I bundle the same application and the python interpreter (same version, 2.6) in an executable in windows and run the app the result is instead
C:\\path\\to\\folderfilename
Any clues as to what might be the problem, or what would cause such inconsistencies in the output ?
回答1:
Your code is malformed. You need to double those backslashes or use a raw string.
os.path.join('C:\\path\\to\\folder', 'filename').
I don't know why it works in one interpreter and not the other but your code will not be interpreted properly as is. The weird thing is i'd have expected a different output, ie: C:pathtofolder\filename.
回答2:
It is surprising behavior. There is no reason it should behave in such a way.
Just be be cautious, you can change the line to the following.
os.path.join(r'C:\path\to\folder\', 'filename').
Note the r'' raw string and the final \
回答3:
Three things you can do:
Use double-slashes in your original string, 'C:\\path\\to\\folder'
Use a raw string, r'C:\path\to\folder'
Use forward-slashes, 'C:/path/to/folder'
回答4:
I figure it out yesterday. As usual when things seem really strange, the explanation is very simple and most of the times involve you being stupid.
To cut a long story short there were leftovers from some previous installations in dist-packages. The bundled interpreter loaded the module from there , but when i ran the python script from the terminal , the module (newer version) in the current dir was loaded. Hence the "unpredictable" results.
来源：https://stackoverflow.com/questions/4982105/unpredictable-results-from-os-path-join-in-windows