# To install a specific version of a package using pip:
pip install Package_name==version
# Example:
pip install MySQL_python==1.2.2
# At the time of writing this numpy is in version 1.19.x
# This statement below will install numpy version 1.18.1
python -m pip install numpy==1.18.1
py -3.7 -m pip install opencv-python
pip install Package_name==version
# Example:
pip install MySQL_python==1.2.2