Install Python from:
by downloading the "Python 2.7 Windows installer" (or Python 2.6 or 2.5) and running it. Add python directory to your system environment path variable (My Computer -> Advanced -> Environment Variables -> Path -> Edit).
by downloading and running the .exe in "Featured Downloads". Select to only install "Git Bash". Select "Checkout as-is, commit as-is" option. There should be a "Git Bash" executable on your Desktop.
Run "Git Bash" terminal window, then:
$ git clone git://github.com/sympy/sympy.git $ cd sympy $ bin/isympy
You can also run python just like on linux. In sympy directory type:
$ python >>> import sympy >>>
If you want to make patches for SymPy see also: Development workflow