Dictionary Data Structure:
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1.If we want to represent a group of objects as a key value pairs then we should go for key value pair.
2.Duplicate keys are not allowed but values can be duplicate.
3.insertion order is not preserved.
4.Dictionaries are mutable.
5.Dictionaries are dynamic.
6.indexing and slicing concept are not applicable.
Write a Python program to iterate over dictionaries using for loops.
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