Question: In python, Write a function countAs ( filename ) which takes one string input. The argument is the filename. In the function, you need to

In python, Write a function countAs(filename) which takes one string input. The argument is the filename. In the function, you need to open the given file in read mode and read the contents of the file. Loop over the contents and count the number of times the letter A or a appears in the file. Return the count.

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