["python","pip"]
Pip freeze vs. pip list

Why does pip list generate a more comprehensive list than pip freeze? $ pip list feedparser (5.1.3) pip (1.4.1) setuptools (1.1.5) wsgiref (0.1.2) $ pip freeze feedparser==5.1.3 wsgiref==0.1.2 Pip's documentation states: freeze Output installed packages in requirements format. list List installed packages. What is a "requirements format"?
One may generate a requirements.txt via: pip freeze > requirements.txt A user can use this requirements.txt file to install all the dependencies. For instance: pip install -r requirements.txt The packages need to be in a specific format for pip to understand, such as: # requirements.txt feedparser==5.1.3 wsgiref==0.1.2 django==1.4.2 ... That is the "requirements format". Here, django==1.4.2 implies install django version 1.4.2 (even though the latest is 1.6.x). If you do not specify ==1.4.2, the latest version available would be installed. You can read more in "Virtualenv and pip Basics", and the official "Requirements File Format" documentation.