[Solved] Python else condition prints several times

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You are always printing something when you are testing, use a temporary variable and print the result after scanning the full list:

success = False
for i in sheet_data:
    if (i[0] == "BN") and (i[1] == "YOU"):      
        found_list.append(i)
        success = True
if success:
    print("Success")
else:
    print("error")

solved Python else condition prints several times