can't install tensorflow with pip code example

Example 1: how to pip install tensorflow

py -m pip install tensorflow
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Example 2: pip install tensorflow not working

python3 -m pip install --upgrade https://storage.googleapis.com/tensorflow/mac/cpu/tensorflow-1.12.0-py3-none-any.whl

Example 3: pip install tensorflow not working

python3 -m pip install --upgrade https://storage.googleapis.com/tensorflow/mac/cpu/tensorflow-1.12.0-py3-none-any.whl

Example 4: cant install tensorflow pip python 3.6

pip install --upgrade tf