Write a Python function which will be called: KeyGen. The important function that must be performed is verifying that the chosen keyword contains no double letters. So HELLO and 111 are invalid keywords, but PIKACHU and ORANGE are valid. It may have the following psuedocode:

INPUT: None

OUTPUT: keyword

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def KeyGen ():

while True:

Ask user for keyword

Check if keyword has any repeated letters

If the keyword has no repeated letters:

return the keyword

Hint: You might want to use Python's count method. For instance, if a = 'foo' then a.count ('f') returns 1, while a.count ('o') returns 2. A keyword where the count of each letter in the keyword is 1.