Firstly, you need to install libpq-dev and python-dev ( python-dev is optional ).

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Then, you can run pip install psycopg2 this command. Just run this command to install the above two mentioned packages.

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If you face Python.h: No such file or directory this error then just install python3-dev.

sudo apt-get install libpq-dev python-dev

export PATH="/Applications/Postgres.app/Contents/Versions/latest/bin:$PATH" 

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pip install psycopg2

sudo apt-get install libpq-dev python-dev

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sudo dnf install libpq-devel

export PATH=$PATH:/path/to/pg_config/

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