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Sajidur Rahman Shajib
Sajidur Rahman Shajib

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Do not use `pip freeze`

We are using pip freeze or pip3 freeze command for making requirements.txt for our python projects. We use pip freeze > requirements.txt right?

But when we try to install our project to another machine that time we use pip install -r requirements.txt command to install those packages which we need for that project. But most of the time we face an error which is - version not satisfied.

At first, let's try to understand what freeze actually is for.

"pip freeze is a very useful command, because it tells you which modules you've installed with pip install and the versions of these modules that you are currently have installed on your computer. In Python, there's a lot of things that may be incompatible, such as certain modules being incompatible with other modules."

So if we use pip freeze to make requirements.txt which list we found those all dependencies we don't need our single project. And in that list we don't know which module is compatible and which is incompatible.

So what should be a better approach?

Use pip-compile command. This command makes requirements.txt with which dependencies only you need.

For this command at first install pip install pip-tools

Suppose you want install a django project so what should you do -

  1. At first create virtual environment - python-venv env
  2. Then active environment - source env/bin/activate
  3. Now create file and then write in it only 'django'.
  4. Now write pip-compile and hit enter. Then you will find a requirements.txt like -
# This file is autogenerated by pip-compile with python 3.8
# To update, run:
#    pip-compile
    # via django
    # via django
    # via -r
    # via django

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Now you are ready to install your Django. Just write pip install -r requirements.txt and hit enter.

With exact dependencies and comments requirements.txt ready use. So now no unnecessary dependency related issues.

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