我曾嘗試使用此代碼比較 .py 代碼的 2 個檔案，但它只限于給我最后幾行代碼，例如，如果 file1 有 2014 行，file2 有 2004 行，那么它回傳 file1 的最后 10 行，但這不是我需要提取那些在file1中但不在file2中的行。
import shutil
file1 = 'bot-proto7test.py'
file2 = 'bot-proto7.py'
with open(file1, 'r') as file1:
with open(file2) as file2:
with open ("output.txt", "w") as out_file:
file2.seek(0, 2)
file1.seek(file2.tell())
shutil.copyfileobj(file1, out_file)
uj5u.com熱心網友回復：
您可以使用集合來做到這一點：
with open(file1, 'r') as f:
set1 = {*f.readlines()}
with open(file2, 'r') as f:
set2 = {*f.readlines()}
print(set1 - set2) # it contains only line that are in first file
順便提一句。您可以使用單個with陳述句打開多個檔案！
with open("f1.txt", "r") as f1, open("f2.txt", "r") as f2:
set1, set2 = {*f1.readlines()}, {*f2.readlines()}
如果我們想保留多行，我們可以使用Counter
from collections import Counter
with open(file1, 'r') as f:
c = Counter(f.readlines())
# simple substraction won't work here if first file contains more occurences than secod
res = Counter({k: v for k, v in c.items() if k not in set2})
print(list(res.elements()))
最后，如果您還想保留順序，則需要使用原始內容：
with open(file1, 'r') as f:
original = f.readlines()
res = {*original} - set2
res = [el for el in original if el not in res]
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