In [1]:

    

import sys      # import system moodule (don't ask) 

print('\nWhat version of Python? \n', sys.version, '\n', sep='') 

if float(sys.version_info[0]) < 3.0 :       
    raise Exception('Program halted, old version of Python. \n', 
                    'Sorry, you need to install Anaconda again.')
else:
    print('Congratulations, Python is up to date!')


    

    




What version of Python? 
3.4.1 |Anaconda 2.2.0 (64-bit)| (default, Jun 11 2014, 17:27:11) [MSC v.1600 64 bit (AMD64)]

Congratulations, Python is up to date!