You can’t index (__getitem__) a _io.TextIOWrapper object. What you can do is work with a list of lines. Try this in your code:
lst = open(input("Input file name: "), "r").readlines()
Also, you aren’t closing the file object, this would be better:
with open(input("Input file name: ", "r") as lst:
print(medianStrat(lst.readlines()))
with ensures that file get closed, see docs
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