Add pip.md

common/pip.md

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+# pip
+
+> Python package manager
+
+- Install a package
+
+`pip install {{somepackage}}
+
+- Upgrade a package
+
+`pip install -U {{somepackage}}
+
+- Uninstall a package
+
+`pip uninstall {{somepackage}}`
+
+- Save installed packages to file
+
+`pip freeze > {{requirements.txt}}`
+
+- Install packages from file
+
+`pip install -r {{requirements.txt}}`