can any expert explain the code ‘for i in file: name=I[:-4]’ mean?

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I am trying to understand the code as follow：（the propose is to sort the list by scores）

file=['Leo102\n','Alex383\n','evelyn570\n','John275\n']

for i in file:
    name=i[:-4]
    score=int(I[-4:-1])


from Recent Questions - Stack Overflow https://ift.tt/2NzaOrD
https://ift.tt/eA8V8J

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