for循环不会循环到下一个元素python

Question

I am trying to loop through a list. But it is getting the first element. It doesn't gets the second element. I can't figure out what i am doing wrong.

filte = ['fingerprint','cipher']
dupe = ['cipher','extract']

for val in filte:
    print(val)
    if val in dupe:
        dupe.remove(val)
    else:
        filte.remove(val)

print("filter",filte)
print("dupe",dupe)

output i got:

fingerprint
filter ['cipher']
dupe ['cipher', 'extract']

required output:

fingerprint
cipher
filter ['cipher']
dupe [ 'extract']

Answer 1

Use set

Ex:

filte = ['fingerprint','cipher']
dupe = ['cipher','extract']

print(list(set(filte) - set(dupe)))  #OR list(set(filte).difference(set(dupe)))
print(list(set(dupe) - set(filte)))

Output:

['fingerprint']
['extract']

Note: Not a good practice to remove elements while iterating the object.

Answer 2

just remove the else

filte = ['fingerprint','cipher']
dupe = ['cipher','extract']

for val in filte:
    print(val)
    if val in dupe:
        dupe.remove(val)
        filte.remove(val)

print("filter",filte)
print("dupe",dupe)

output:

fingerprint
cipher
filter ['fingerprint']
dupe ['extract']