>>> a,b,c = ([].copy() for i in range(3))
>>> a,b,c
([], [], [])
>>> a is b
False
>>>
def search(nickname, file):
for line in open(file):
if nickname in line:
return line
nickname = input("Введите ник: ")
vime = search(nickname, r"vimeworld.txt")
dex = search(nickname, r"dexcraft.txt")
print("VimeWorld: %s"%vime)
print("DexCraft: %s"%dex)
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