从python 3.x中的文件读取令牌 [英] Reading tokens from a file in python 3.x

问题描述

是否有某种方式可以通过令牌从文件中读取信息，而与格式无关?例如，如果我尝试从输入文件中生成ppm图像，而不是2个像素

Is there some way to read in information from a file by token regardless of the formatting? For example, if I am trying to generate a ppm image from an input file and instead of 2 pixels being

255 0 0
0 0 255

它显示为

255
0 0
0
0 255

在这种情况下，我想通过令牌读取而不是在循环中按行读取，但是我找不到与此相关的任何内置方法.

I'd like to read by token in this situation instead of by line in my loop but I can't find any built in methods regarding this.

推荐答案

您始终可以滚动自己的文件迭代器:

You could always roll your own file iterator:

class file_tokens:
    def __init__(self, file):
        self.file = file
        self.line = []
    def __iter__(self):
        return self
    def next(self):
        while not len(self.line):
            self.line = self.file.readline()
            if not self.line:
                raise StopIteration
            self.line = self.line.split()
        return self.line.pop(0)

然后像普通文件一样使用:

Then use like a normal file:

for token in file_tokens(open(infile)):
    print('Token: ' + token)

这篇关于从python 3.x中的文件读取令牌的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！