From the Python website, download the MSI version of Python you wish to install.
Then open your command prompt and use this command:
msiexec /a python-2.7.10.msi /qb TARGETDIR=C:\python27
Substitute python-2.7.10.msi, if you downloaded Python 3 and adjust your TARGETDIR to where you want it to go.
The /qb flag will give you a small dialog progress bar.