python - Python 中的 For 循环结构

Question

Python中的for循环逻辑是否可能如下？:

with  open("file_r", "r") as infile, open("file_1", 'w') as outfile_1, open("file_2", 'w') as outfile_2: 
    for result in re.findall('somestring(.*?)\}', infile.read(), re.S):
       for line in result.split('\n'):
           outfile_1.write(line) 

    for result in re.findall('sime_other_string(.*?)\}', infile.read(), re.S):
       for line in result.split('\n'):
           outfile_2.write(line)

我这么问是因为第一个 foo 循环的结果写入了“outfile_1”文件，但第二个循环的结果在“outfile_2”文件中为空。

Answer 1

将 infile.read() 保存到变量中，否则文件将在第一个循环本身中完成。说:

with  open("file_r", "r") as infile, open("file_1", 'w') as outfile_1, open("file_2", 'w') as outfile_2: 
    contents = infile.read()

    for result in re.findall('somestring(.*?)\}', contents, re.S):
       for line in result.split('\n'):
           outfile_1.write(line) 

    for result in re.findall('sime_other_string(.*?)\}', contents, re.S):
       for line in result.split('\n'):
           outfile_2.write(line)