Python 3.5.2+ (default, Sep 22 2016, 12:18:14) 
[GCC 6.2.0 20160927] on linux
Type "copyright", "credits" or "license()" for more information.
>>> 
======= RESTART: /home/brent/teaching/150/lectures/S17/dictionaries.py =======
>>> total_values({'a':1, 'b':3, 'c':99})
103
>>> 
======= RESTART: /home/brent/teaching/150/lectures/S17/dictionaries.py =======
>>> normalize_frequencies({'a':1, 'b':3})
{'b': 0.75, 'a': 0.25}
>>> normalize_frequencies({})
{}
>>> 
======= RESTART: /home/brent/teaching/150/lectures/S17/dictionaries.py =======
>>> frequencies({'a':1, 'b':3})
{'b': 0.5, 'a': 0.5}
>>> frequencies('babb')
{'b': 0.75, 'a': 0.25}
>>> frequencies('iuherg3w4#&%)(&#W$&W$Y')
{'e': 0.045454545454545456, '3': 0.045454545454545456, 'w': 0.045454545454545456, 'W': 0.09090909090909091, 'u': 0.045454545454545456, 'h': 0.045454545454545456, 'r': 0.045454545454545456, 'g': 0.045454545454545456, 'i': 0.045454545454545456, ')': 0.045454545454545456, '(': 0.045454545454545456, '&': 0.13636363636363635, '$': 0.09090909090909091, 'Y': 0.045454545454545456, '#': 0.09090909090909091, '%': 0.045454545454545456, '4': 0.045454545454545456}
>>>