New submission from Aaron:
When using os.path.isfile() and os.path.exists() in a while loop under certain
conditions, os.path.isfile() returns True for paths that do not actually exist.
Conditions:
The folder "C:\Users\EAARHOS\Desktop\Python Review" exists, as do the files
"C:\Users\EAARHOS\Desktop\Python Review\baseExcel.py" and
"C:\Users\EAARHOS\Desktop\Python Review\baseExcel.py.bak". (Note that I also
tested this on a path that contained no spaces, and got the same results.)
Code:
>>> bak_path = r"C:\Users\EAARHOS\Desktop\Python Review\baseExcel.py"
>>> while os.path.isfile(bak_path):
... bak_path += '.bak'
... if not os.path.isfile(bak_path):
... break
Traceback (most recent call last):
File "<interactive input>", line 3, in <module>
File "C:\Installs\Python33\Lib\genericpath.py", line 29, in isfile
st = os.stat(path)
ValueError: path too long for Windows
>>> os.path.isfile(r"C:\Users\EAARHOS\Desktop\Python
>>> Review\baseExcel.py.bak.bak")
False
>>>
>>> bak_path = r"C:\Users\EAARHOS\Desktop\Python Review\baseExcel.py"
>>> while os.path.exists(bak_path):
... bak_path += '.bak'
... if not os.path.exists(bak_path):
... break
Traceback (most recent call last):
File "<interactive input>", line 3, in <module>
File "C:\Installs\Python33\Lib\genericpath.py", line 18, in exists
st = os.stat(path)
ValueError: path too long for Windows
>>> os.path.exists(r"C:\Users\EAARHOS\Desktop\Python
>>> Review\baseExcel.py.bak.bak")
False
>>>
>>> bak_path = r"C:\Users\EAARHOS\Desktop\Python Review\baseExcel.py"
>>> os.path.isfile(bak_path), os.path.exists(bak_path)
(True, True)
>>> bak_path += '.bak'
>>> os.path.isfile(bak_path), os.path.exists(bak_path)
(True, True)
>>> bak_path += '.bak'
>>> os.path.isfile(bak_path), os.path.exists(bak_path)
(True, True)
>>> bak_path
'C:\\Users\\EAARHOS\\Desktop\\Python Review\\baseExcel.py.bak.bak'
>>> temp = bak_path
>>> os.path.isfile(temp), os.path.exists(temp)
(True, True)
>>> os.path.isfile('C:\\Users\\EAARHOS\\Desktop\\Python
>>> Review\\baseExcel.py.bak.bak'),
>>> os.path.exists('C:\\Users\\EAARHOS\\Desktop\\Python
>>> Review\\baseExcel.py.bak.bak')
(False, False)
>>>
On the other hand, this code works as expected:
>>> bak_path = r"C:\Users\EAARHOS\Desktop\Python Review\baseExcel.py"
>>> while os.path.isfile(bak_path):
... temp = bak_path + '.bak'
... bak_path = temp
...
>>> bak_path
'C:\\Users\\EAARHOS\\Desktop\\Python Review\\baseExcel.py.bak.bak'
>>>
>>> bak_path = r"C:\Users\EAARHOS\Desktop\Python Review\baseExcel.py"
>>> while os.path.exists(bak_path):
... temp = bak_path + '.bak'
... bak_path = temp
...
>>> bak_path
'C:\\Users\\EAARHOS\\Desktop\\Python Review\\baseExcel.py.bak.bak'
>>>
----------
components: Windows
messages: 229936
nosy: hosford42, steve.dower, tim.golden, zach.ware
priority: normal
severity: normal
status: open
title: os.path.isfile & os.path.exists but in while loop
type: behavior
versions: Python 3.3
_______________________________________
Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue22719>
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