checking if a letter is present in a string in python

This question already has an answer here:

Does Python have a string 'contains' substring method? 13 answers

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>>> 'N' in 'PYTHON'
True
>>> 'N' in 'STACK OVERFLOW'
False
>>> 'N' in 'python' # uppercase and lowercase are not equal
False
>>> 'N' in 'python'.upper()
True

Also, there is no need for a conditional statement when assigning to your flag . Rather than

flag = False
if 'N' in your_string:
   flag = True

do

flag = 'N' in your_string

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