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Using "IN" for a string to find out how many of a certain letter...?

 
Ranch Hand
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I was wondering if there is a way to use the IN command to find out "how many" of a certain letter are in a string.
Here is the code so far:



I know this doesn't work, but just wondering if there is a way of accomplishing this in a similar way.
 
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s.count(letter)
 
Greenhorn
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To expand upon Karthik Shiraly's answer you can also do this to account for case:
s.lower().count(<search ltr>)
 
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