[Python] How can I compare the contents of two text files in Python?

I need to write a script that compares the contents of two text files. I want to give an example for what I want:

file1.txt's content:

New York
Los Angeles
Miami


file2.txt's content:

New York
Orlando
Miami
Dc


I want to compare the two texts and print the different added or missed elements.

My code attempt is here:

from difflib import Differ

from numpy import diff

myfile1 = input("Enter First File's name for compare : ")
myfile2 = input("Enter Second File's name for compare : ")

ch1 = myfile1.split(".")
ch2 = myfile2.split(".")

if ch1[1] == "txt" and ch2[1] == "txt":
with open(myfile1) as file_1, open(myfile2) as file_2:
differ = Differ()

for line in differ.compare(file_1.readlines(), file_2.readlines()):
print(line)

else:
print("File format Eror !")


I already use difflib, but if some content is missed this thing is adding "-" in front of the name, also if content is added "+" is added in front of the name. I need to print added and missed contents.

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