What Is _Pycache_

what is pycache folder in flask python?

.pyc files are compiled Python files written by the Python interpreter. Read here.

Where is my _pycache_ folder and .pyc byte code files?

The directory is called __pycache__ (with double underscores).

It'll only be created if Python has permission to create a directory in the same location the .py file lives. The folder is not hidden in any way, if it is not there, then Python did not create it.

Note that .pyc bytecode cache files are only created for modules your code imports; it is not created for the main script file. If you run python.exe foobar.py, no __pycache__/foobar.cpython-34.pyc file is created.

Python3 project remove __pycache__ folders and .pyc files

I found the answer myself when I mistyped pyclean as pycclean:

    No command 'pycclean' found, did you mean:
     Command 'py3clean' from package 'python3-minimal' (main)
     Command 'pyclean' from package 'python-minimal' (main)
    pycclean: command not found

Running py3clean . cleaned it up very nicely.

__pycache__ folder executes each time i run any other file in the folder

I actually named the file as regex.py. when I deleted the __pycache__ folder and changed the file name to file_regex.py the __pycache__ folder didn't show up again and the problem was solved.

How to delete all __pycache__ folders in directory tree

Here is simple solution if you already know where the __pycache__ folders are just try the following

import shutil
import os

def clearCache():
    """
    Removes generic `__pycache__` .

    The `__pycache__` files are automatically created by python during the simulation.
    This function removes the genric files on simulation start and simulation end.
    """
    path = 'C:/Users/Yours/Desktop/LPG'
    try:
       for all in os.listdir(path):
        if os.path.isdir(path + all):
            if all == '__pycache__':
                shutil.rmtree(path + all, ignore_errors=False) 
    except:
        pass
clearCache()

Just simple you can still modify the path to the actually your path is.
And if you want the script to penetrate into the subdirectories to remove the pycache folders just check the following

Example

import shutil
import os

path = 'C:/Users/Yours/Desktop/LPG'
for directories, subfolder, files in os.walk(path):
    if os.path.isdir(directories):
        if directories[::-1][:11][::-1] == '__pycache__':
                        shutil.rmtree(directories)

Should I store temporary files in the __pycache__ folder?

You should either...

• Have all caching to happen at runtime: This beats your purpose. However, it is the only way not to touch the filesystem at all.
• Dedicate a special folder like __memo__ or something: This will allow you to have caching across several executions. However, you'll "pollute" the application's file structure.

Reasons you should never mess up with __pycache__:

• __pycache__ is CPython-specific. Although it's most likely the implementation you're using right now, it's not portable/safe/good practice to assume everyone does for no good reason at all.
• __pycache__ is intended as a transparent optimization, that is, no one should care if it exists at all or not. This is a design decision from the CPython folks, and so you should not circumvent it.
• Due to the above, the aforementioned directory may be disabled if the user wants to. For instance, in CPython, if you do python3 -B myapp.py, no __pycache__ will be created if it doesn't exist, and otherwise will be ignored.
• Users often delete __pycache__ because of the above two points for several reasons. I do, at least.
• Messing things inside __pycache__ because "it doesn't pollute the application's file structure" is an illusion. The directory can perfectly be considered as "pollution". If the Python interpreter already pollutes stuff, why can't you with __memo__ anyway?

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