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    Upvotes37edited Sep 23, 2012 at 16:27

    Your none values are actually strings in your dictionary.

    You can check for 'None' or use actual python None value.

    d = {'a':None,'b':'12345','c':None}

    for k,v in d.items():
    if d[k] is None:
    print "good"
    else:
    print "Bad"

    prints "good" 2 times

    Or if you Have to use your current dictionary just change your check to look for 'None'

    additionally dict is a python built in type so it is a good idea not to name variables dict

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    What happens if a dict contains false values?if dict contains Falses, this will break. You could have Python do the looping in C code by using a dictionary view; this does a membership test against all values without creating a new list: (In Python 2, use dict.viewvalues () to get a dictionary view, as dict.values () returns a list there).

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    Should a dict have a loop if it contains false values?@Jon For the most part, in a duck-typed language, it should not have to, unless explicitly needed which is not clear in this case. if dict contains Falses, this will break. You could have Python do the looping in C code by using a dictionary view; this does a membership test against all values without creating a new list:

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    What is the difference between empty Dict and non-empty dictionary?This should be the accepted answer as it is the only answer differentiating between empty dict 's and anything evaluating to None. A dictionary can be automatically cast to boolean which evaluates to False for empty dictionary and True for non-empty dictionary.

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