python - 在python中使用difflib比较两个文件

Question

我正在尝试使用 difflib 比较两个文件。比较后，如果未检测到差异，我想打印“No Changes”。如果差异是他们在某些方面。我想打印那些行。

我试过这样的:

with open("compare.txt") as f, open("test.txt") as g:
            flines = f.readlines()
            glines = g.readlines()
        d = difflib.Differ()
        diff = d.compare(flines, glines)
        print("\n".join(diff))

如果检测到“没有变化”，它将打印文件的内容。但如果没有差异，我想打印“No Changes”。

Answer 1

检查每个元素中的第一个字符是否在开头有 + 或 -(标记该行已更改):

with open("compare.txt") as f, open("test.txt") as g:
        flines = f.readlines()
        glines = g.readlines()
        d = difflib.Differ()
        diffs = [x for x in d.compare(flines, glines) if x[0] in ('+', '-')]
        if diffs:
            # all rows with changes
        else:
            print('No changes')