[Python] Is there any way to show the dependency trees for pip packages?

I have a project with multiple package dependencies, the main requirements being listed in requirements.txt. When I call pip freeze it prints the currently installed packages as plain list. I would prefer to also get their dependency relationships, something like this:

Flask==0.9
Jinja2==2.7
Werkzeug==0.8.3

Jinja2==2.7

Werkzeug==0.8.3

Flask-Admin==1.0.6
Flask==0.9
Jinja2==2.7
Werkzeug==0.8.3


The goal is to detect the dependencies of each specific package:

Werkzeug==0.8.3
Flask==0.9
Flask-Admin==1.0.6


And insert these into my current requirements.txt. For example, for this input:

Flask==0.9
Flask-Admin==1.0.6
Werkzeug==0.8.3


I would like to get:

Flask==0.9
Jinja2==2.7
Flask-Admin==1.0.6
Werkzeug==0.8.3


Is there any way show the dependencies of installed pip packages?

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