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I have a list to be used as keys for the dictionary and every value corresponding to the keys is to be initialized to 0.
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How do you initialize a dictionary key? If you want to initialize all keys in the dictionary with some default value, you can use the fromkeys() function. If no default value is specified, the dictionary is initialized with all values as None .
Dictionaries in Python However, there are a couple restrictions that dictionary keys must abide by. First, a given key can appear in a dictionary only once. Duplicate keys are not allowed. A dictionary maps each key to a corresponding value, so it doesn't make sense to map a particular key more than once.
You can remove duplicates using a Python set or the dict. fromkeys() method. The dict. fromkeys() method converts a list into a dictionary.
Dictionary. Dictionaries are used to store data values in key:value pairs. A dictionary is a collection which is ordered*, changeable and do not allow duplicates.
You can do with dict.fromkeys
In [34]: dict.fromkeys(range(5),0)
Out[34]: {0: 0, 1: 0, 2: 0, 3: 0, 4: 0}
In [35]: dict.fromkeys(['a','b','c'],0)
Out[35]: {'a': 0, 'b': 0, 'c': 0}
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