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I was wondering if there is a way to run map on something. The way map works is it takes an iterable and applies a function to each item in that iterable producing a list. Is there a way to have map modify the iterable object itself?
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Dictionaries in Python 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.
Sets cannot contain duplicates. Duplicates are discarded when initializing a set. If adding an element to a set, and that element is already contained in the set, then the set will not change.
Tuple is a collection which is ordered and unchangeable. Allows duplicate members.
The dict. copy() method returns a shallow copy of the dictionary. The dictionary can also be copied using the = operator, which points to the same object as the original. So if any change is made in the copied dictionary will also reflect in the original dictionary.
A slice assignment is often ok if you need to modify a list in place
mylist[:] = map(func, mylist)
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