How to automatically download/install all the necessary libraries in python?

Question

I wrote this code to test some imports:

import fnmatch
import os
import psutil
import pygetwindow as window
from time import sleep
import win32api
import PySimpleGUI as pys
import pyautogui as py
from time import sleep
import webbrowser
import winsound
import importlib.util
from random import randint
from datetime import date
import locale

layout = [
    [pys.Text(f'Complete =)', size=(25, 0))],
]
jan = pys.Window('Test', layout=layout, finalize=True)
jan.read()

I then made an executable using freeze, and sometimes the following error appears:

ModuleNotFoundError: No module named: (lib)

It's always a different (lib). I tried to run pip install (lib) for each (lib) but that didn't work.

Is there some way to check if some (lib) is installed and if it isn't, automatically download that (lib) in code?

Part of the PySimpleGUI SDK contains calls for managing pip installs. They may/may-not be helpful to take a look at. — Mike from PSG
– Mike from PSG, Commented May 13, 2024 at 13:05

Gino Mempin · Accepted Answer · 2024-05-13 04:10:09Z

2

When you say "making executable using freeze", I think you are referring to a requirements.txt file, which is generated by doing pip freeze> requirements.txt on the command line (and don't forget to remove the unnecessary imports).

You can download all the necessary libraries by doing

pip install -r requirements.txt

To check if a library is installed and automatically install it, you check by using import <packagename>

import sys
import subprocess

try:
    import <packagename>
except Exception as e:
    subprocess.check_call(
        [sys.executable, '-m', 'pip', 'install', '<packagename>'])

edited May 13, 2024 at 4:10

Gino Mempin

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answered Jul 6, 2021 at 17:04

Rishu Pandey

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4 Comments

user15785950 Over a year ago

I use cx_Freeze to make my executables, i know that exist PyInstaller but no works in my pc =(

user15785950 Over a year ago

I edited my post, you talking about like this?

Rishu Pandey Over a year ago

Well now look like you had confused me with your problem heading.

user15785950 Over a year ago

I'm confused too, but, my problem is done, thanks haha

Gino Mempin · Accepted Answer · 2024-05-13 04:05:10Z

_{(This is a copy of the OP's solution, reposted it from the question into an actual answer)}
_{(It was copied from revision: https://stackoverflow.com/revisions/68274500/2})

Here is the changed code:

import sys
import subprocess

packages = []
file = open('requirements.txt', 'r')
for lines in file:
    packages.append(lines)
file.close()

for library in packages:
    try:
        import library
    except Exception as e:
        library= library.replace("\n", "")
        subprocess.check_call(
            [sys.executable, '-m', 'pip', 'install', library]
        )

import pygetwindow as window
import PySimpleGUI as pys
import pyautogui as py
import importlib.util
import psutil

layout = [
    [pys.Text(f'Complete =)', size=(25, 0))],
]
jan = pys.Window('Test', layout=layout, finalize=True)
jan.read()

Here is the requirements.txt:

PySimpleGUI
psutil
pygetwindow
pyautogui
importlib

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