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  1. Bokep

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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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  3. Stack Overflow
    https://stackoverflow.com/questions/12553938

    if statement - None value in python dictionary - Stack …

    Define your dictionary with. d = {'a': None} rather than. d = {'a': 'None'} In the latter case, 'None' is just a string, not Python's None type. Also, test for None with the identity operator is: for key, value in d.iteritems(): if value is None: print "None found!"

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    What are Python dictionaries?The Python dictionary is one of the language’s most powerful data types. In other programming languages and computer science in general, dictionaries are also known as associative arrays. They allow you to associate one or more keys to values. If you are familiar with JSON, you might feel right at home.

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    What if there is no key in a Python dictionary?If we specifically try to access a key that is None, and there is no such key in the dictionary, we will get KeyError: None. In this Python dictionary, we have the populations of some major US cities. The keys are the names of the cities and the values are the respective populations.

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    How to check if a dictionary has a non-none value in Python?: False Time complexity: O (1) since dictionary lookups are constant time in python. Auxiliary Space: O (1) since we only use constant additional memory. Method 4: using the “try-except” block to check if the key has a non-None value in the dictionary: Approach: Initialize the dictionary with key-value pairs. Print the original dictionary.

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    What is a dictionary key in Python?Almost any type of value can be used as a dictionary key in Python. You just saw this example, where integer, float, and Boolean objects are used as keys: You can even use built-in objects like types and functions: However, there are a couple restrictions that dictionary keys must abide by.

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