Python - 反转整个文件

Question

我需要能够反转整个文件，或者至少是它的内容。到目前为止我的代码是:

def reverse_file(of, rf):
     oldfile = open(of, 'r')
     reversefile = open(rf, 'w')
     filedata = oldfile.read()
     rdata = str_reverse(filedata)
     reversefile.write(rdata)
     oldfile.close()
     reversefile.close()

问题是我需要定义 str_reverse 并且我不确定如何创建一个反转所有内容的函数。有帮助吗？

Answer 1

如果你想反转整个文件，你可以用data[::-1]调用write

def reverse_file(of, rf):
    with open(of) as oldfile:
        with open(rf, "w") as reversefile:
            reversefile.write(oldfile.read()[::-1])

例子:

% cat testdata
line1
line2
line3
% cat reverse_file.py
def reverse_file(of, rf):
    with open(of) as oldfile:
        with open(rf, "w") as reversefile:
            reversefile.write(oldfile.read()[::-1])

if __name__ == "__main__":
    reverse_file("testdata", "newdata")
% python reverse_file.py
% cat newdata

3enil
2enil
1enil