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Cannon was further intrigued by the perching habits and lovely color of the green tree pythons at the San Diego Zoo . It all adds up to Python power at the keyboard . Developers ' Day allows the Python community the once-a-year chance to personally interact with Python 's creator Guido van Rossum and other developers . Some of the changes only affect people who deal with the Python interpreter at the C level because they're writing Python extension modules , embedding the interpreter , or just hacking on the interpreter itself . This request was posted to the Python newsgroup at the time of the beta cycle for Python 1.5 and Guido van Rossum suggested a modification to his ( at the time undocumented ) popen2.py module ( 4 ) that would allow popen2 ( ) to accept a list of arguments as well as a string , and would not pass the arguments through a round of / bin / sh in the former case .