New submission from Bernard Lang:
The empty path '' is considered as an acceptable path in os.path.join, and
works as a neutral prefix:
print os.path.join('','aaa') ===> aaa
which seems rather natural.
But it raises an exception when used as a parameter to os.listdir.
Logically, it should then list the current directory.
(the alternative would be to raise an exception when os.path.join gets an empty
argument).
The inconsistency became clear to me when I had to write the following function
:
def listdirs(path,flist): # Appends to "flist" all paths to files that
# start with "path". Argument "path" can be empty string ''.
if path=='' : localist=os.listdir('.')
else : localist=os.listdir(path)
for f in localist :
p=os.path.join(path,f)
flist.append(p)
if os.path.isdir(p) :
listdirs(p,flist)
return flist
The conditionnal is needed only to avoid the exception, while the code is
unique afterwards.
This is related to Issue818059, but I did not see how that issue was resolved.
Furthermore, the case of the empty path as argument to os.listdir should be
documented in http://docs.python.org/2/library/os.html
----------
components: Library (Lib)
messages: 185207
nosy: babou
priority: normal
severity: normal
status: open
title: os.listdir and os.path.join inconsistent on empty path
type: enhancement
versions: Python 2.7
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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue17545>
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