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The lenght of the dataset shoud be more than my result

Screen Link:

My Code:

unique_apps = []
duplicated_apps = []
for app in file1:
    name = app[0]
    if app in unique_apps : 
    else : 

the number of duplicates is : 0

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What I expected to happen:
first, file1 represents the dataset in which I have the google play apps. I expected that I will get some duplicates in the dataset 
What actually happened: I got 0 duplicates...

You are checking if app is in the list and not the name. That’s why your list of duplicates is empty because the above if condition will never be True.