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curl https://bootstrap.pypa.io/get-pip.py -o get-pip.py
python3.9 get-pip.py
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python2 -m pip install SomePackage # default Python 2
python2.7 -m pip install SomePackage # specifically Python 2.7
python3 -m pip install SomePackage # default Python 3
python3.9 -m pip install SomePackage # specifically Python 3.9
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python-m pip install some pacage
python -m pip install some pacage
## TO install