Error: No module named 'fcntl'

Question

I get the following error:

Traceback (most recent call last):
  File "C:/Users/aaaa/Desktop/ttttttt.py", line 5, in <module>
   import reload
  File "C:\Users\aaa\AppData\Local\Programs\Python\Python36\lib\site-
packages\reload.py", line 3, in <module>
    import sys, time, re, os, signal, fcntl
ModuleNotFoundError: No module named 'fcntl'

So I did a pip install, which also gets an error.

    C:\Users\aaaa>pip install fcntl
    Collecting fcntl
      Could not find a version that satisfies the requirement fcntl (from versions: )
No matching distribution found for fcntl

Search results cPython, hacking, routing and many other words are coming out.

It's a tough answer for beginners, so I want to get a more detailed solution.

How should I solve it?

#py3
import time
from selenium import webdriver
import codecs
import sys
import reload
import re
import fcntl
import os
import signal

What did you do to get it working on Windows? – Mohammed Noureldin Oct 07 '22 at 23:41 — Mohammed Noureldin, Oct 07 '22 at 23:41

score 56 · Answer 1 · answered Jul 21 '17 at 03:31

56

The fcntl module is not available on Windows. The functionality it exposes does not exist on that platform.

If you're trying to lock a file, there are some other Python modules available which provide that functionality. One I've seen referenced in other answers is portalocker.

answered Jul 21 '17 at 03:31

1

thank you for the reply. I have downloaded the above, but now I am having trouble figuring out how to use it. – yome Jul 22 '17 at 06:17
1

Do I understand it properly that I cannot do a non-blocking read from a pipe on Windows in this "language"? – Palo Nov 08 '20 at 15:34
1

@User149341 And after what we have to do? – X0-user-0X Jun 17 '22 at 21:12
Well like the others, this module is not available on Windows, but how can that mentioned package help? – Mohammed Noureldin Oct 07 '22 at 23:40

score 30 · Answer 2 · answered Aug 25 '22 at 13:50

I got the same error when trying to run my flask app using gunicorn.

gunicorn --bind 127.0.0.1:5000 predict:app

The issue is that 'fcntl' is not available on windows. The alternative that can be used, as suggested by Alexey Grigorov in Ml bookcamp, is the 'waitress' package.

pip install waitress

Then write in the command prompt the following command.

waitress-serve --listen=127.0.0.1:5000 predict:app

For those still looking for the answer.

Worked for me on Windows 10 thanks – Mickey Perlstein Nov 05 '22 at 17:28 — Mickey Perlstein, Nov 05 '22 at 17:28

score 1 · Answer 3 · answered May 12 '21 at 01:20

1

I got some info from this website https://pypi.org/project/micropython-fcntl/#files and installed as follows which solved the problem:

pip install micropython-fcntl

answered May 12 '21 at 01:20

Tiras Ngugi

37
2

9

`ERROR: File "setup.py" or "setup.cfg" not found for legacy project micropython-fcntl from https://files.pythonhosted.org/packages/c9/65/f233834bc23621c1a8da644bd1d70cbe5c344bd2dd2b9d424f1f116363ec/micropython-fcntl-0.0.4.tar.gz#sha256=6ce976b79c16084485894e4284c54263c0cc775cf6b4a6fd3bf1d83f29ddf6a1.` :( – cactuschibre Jun 02 '21 at 12:53
3

this is not working as @cactuschibre said :( – Tony Feb 10 '22 at 23:47
`ERROR: micropython-fcntl from https://files.pythonhosted.org/packages/c9/65/f233834bc23621c1a8da644bd1d70cbe5c344bd2dd2b9d424f1f116363ec/micropython-fcntl-0.0.4.tar.gz does not appear to be a Python project: neither 'setup.py' nor 'pyproject.toml' found.` – Apr 13 '23 at 04:50
I am getting the same error as above :( – Sameer Mahajan Jun 07 '23 at 11:12

score -2 · Answer 4 · answered Dec 05 '19 at 14:24

-2

What you can do is install importlib with the usual:

pip install importlib

From there use the following:

from importlib import reload

Note that you will need to load your imports as 'modules':

from petshop import parrot as parrot

answered Dec 05 '19 at 14:24

Victor Hartong

29
1

8

I'm not following how this answer relates to the question. `importlib.reload()` can be used to reload a module. The user's question is related to "`fcntl` doesn't exist on windows". How do you reload a module that isn't even isntalled because it doesn't exist? – bobpaul Sep 25 '21 at 18:45
Besides answering the wrong question, `importlib` needs no pip install in anything released in the last decade (this answer was already obsolete when posted). – Andras Deak -- Слава Україні Feb 13 '23 at 15:03

Error: No module named 'fcntl'

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