Pip Install Timeout Issue

This works for me:

pip --default-timeout=1000 install pandas

PIP has a default timeout of 15 sec, reference guide. Pandas is a relatively big file, at 10MB, and it's dependant Numpy, at 20MB could still be needed (if it is not installed already.). In addition, your network connection may be slow. Therefore, set PIP to take longer time by, for example, giving it 1000 sec:

pip --default-timeout=1000 install pandas

as suggested by @Pouya Khalilzad.