python中文件内容的读写

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python中文件读写是常见的操作，常用的文件打开方式是下面这种：

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with open(file_path,'r+') as f:
    for line in f:
        # your code here

如果要同时打开2个或多个文件，以同时对里面的内容操作，可以采用：

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with open(file1_path,'r+') as f1:
    with open(file2_path,'r+') as f2:
        with open(file3_path,'r+') as f3:
            for line_f1 in f1:
                line_f2=f2.readline()
                line_f3=f3.readline()
                # your code here

而读取文件内容也有若干种方式，除了上面的for line in f: 之外，还有：

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f.readline()        # 读取文件的第一行
f.readline(index)   # 读取文件的第index行
f.readlines()       # 读取文件的所有行，并返回list
for i, line in enumerate(input):        # loop读取文件的每一行，并返回内容和index

或者

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examples = []
with open(src_path) as src_file, open(trg_path) as trg_file:
    for src_line, trg_line in zip(src_file, trg_file):
        src_line, trg_line = src_line.strip(), trg_line.strip()
        if src_line != '' and trg_line != '':
            examples.append(data.Example.fromlist(
                [src_line, trg_line], fields))

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