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Python subprocess/Popen with a modified environment
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I think os.environ.copy() is better if you don't intend to modify the os.environ for the current process:
import subprocess, os
my_env = os.environ.copy()
my_env["PATH"] = "/usr/sbin:/sbin:" + my_env["PATH"]
subprocess.Popen(my_comm...
How to check if there exists a process with a given pid in Python?
... valid process? I'm getting a pid from a different source other than from os.getpid() and I need to check to see if a process with that pid doesn't exist on the machine.
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Non-alphanumeric list order from os.listdir()
...ve noticed that the default order of the lists has changed to something almost nonsensical. For example, if I am in a current directory containing the following subdirectories: run01, run02, ... run19, run20, and then I generate a list from the following command:
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How to get an absolute file path in Python
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>>> import os
>>> os.path.abspath("mydir/myfile.txt")
'C:/example/cwd/mydir/myfile.txt'
Also works if it is already an absolute path:
>>> import os
>>> os.path.abspath("C:/example/cwd/mydir/myfile.txt")
'C:...
Python list directory, subdirectory, and files
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Use os.path.join to concatenate the directory and file name:
for path, subdirs, files in os.walk(root):
for name in files:
print os.path.join(path, name)
Note the usage of path and not root in the concatenation, sinc...
Do Swift-based applications work on OS X 10.9/iOS 7 and lower?
Will Swift-based applications work on OS X 10.9 (Mavericks)/iOS 7 and lower?
19 Answers
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How to find out the number of CPUs using python
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On Python 3.6.2 I could only use os.cpu_count()
– Achilles
Sep 11 '17 at 19:59
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Redirect stdout to a file in Python?
...pt on Windows using just script's name
– Piotr Dobrogost
Oct 4 '12 at 11:00
7
It doesn't work wit...
Determining Whether a Directory is Writeable
...or the user executing the script? Since this will likely involve using the os module I should mention I'm running it under a *nix environment.
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Batch Renaming of Files in a Directory
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Such renaming is quite easy, for example with os and glob modules:
import glob, os
def rename(dir, pattern, titlePattern):
for pathAndFilename in glob.iglob(os.path.join(dir, pattern)):
title, ext = os.path.splitext(os.path.basename(pathAndFilename))
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