python - 从 txt 文件中捕获链接

Question

我有一个 txt 文件，其中有几行...其中一些是链接。我的问题是:如何捕获所有这些链接并将它们保存在另一个 txt 文件中？我是新手。

我试过这个但它不起作用:

filee = open("myfile.txt").readlines()
out_file = open("out.txt","w")
out_file.write("")
out_file.close()

for x in filee:
    if x.startswith("http"):
        out_file.write(x)
        print (x)

Answer 1

您不能写入已关闭的文件。只需移动代码末尾的 out_file.close() 即可:

filee = open("myfile.txt").readlines()
out_file = open("out.txt","w")
out_file.write("")

for x in filee:
    if x.startswith("http"):
        out_file.write(x)
        print (x)
out_file.close()

这里是一个更简洁的版本:

# open the input file (with auto close)
with open("myfile.txt") as input_file:

    # open the output file (with auto close)
    with open("out.txt", "w") as output_file:

        # for each line of the file
        for line in input_file:

            # append the line to the output file if start with "http"
            if line.startswith("http"):
                output_file.write(line)

您还可以将两者结合起来:

# open the input/output files (with auto close)
with open("myfile.txt") as input_file, open("out.txt", "w") as output_file:

    # for each line of the file
    for line in input_file:

        # append the line to the output file if start with "http"
        if line.startswith("http"):
            output_file.write(line)