Python program to show use of user defined functions

1.Write a function that takes a character (i.e. a string of length 1) and returns True if it is a vowel, False otherwise.

2.Define a function that computes the length of a given list or string.

3.Define a procedure histogram() that takes a list of integers and prints a histogram to the screen. For example, histogram([4, 9, 7]) should print the following:

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