如何在Python脚本中使用文件？

Question

我正在编写一个Python脚本，似乎无法理解它的最后一部分。代码如下：

def aggregate(data):
    data.sort()
    i = 0
    while i < len(data) - 1:
        while i < len(data) - 1 and data[i][1] >= data[i+1][0]:
            data[i] = (data[i][0], max(data[i][1], data[i+1][1]))
            data.pop(i+1)
        i += 1

if __name__ == '__main__':
    itervals = [(1,4), (2,2222), (2,3), (4,7), (8,15), (16,31), (32,63), (64,127), (128,255), (256,511), (512,1023), (1024,2047), (2048,4095), (4096,8191), (8192,16383), (16384,32767), (32768,65535), (65536,131071), (131072,262143), (262144,524287), (524288,1048575), (1048576,2097151), (2097152,4194303), (4194304,8388607), (8388608,16777215)]


    formatted = lambda vals: '[{0}]'.format(', '.join('({0}-{1})'.format(
                                                   iterval[0], iterval[1])
                                                   for iterval in sorted(vals)))


    print(formatted(itervals))
    aggregate(itervals)
    print(formatted(itervals))

现在我被迫手动输入数字范围，正如您在这行看到的：

itervals = [(1,4), (2,2222), (2,3), (4,7), (8,15), (16,31), (32,63), (64,127), (128,255), (256,511), (512,1023), (1024,2047), (2048,4095), (4096,8191), (8192,16383), (16384,32767), (32768,65535), (65536,131071), (131072,262143), (262144,524287), (524288,1048575), (1048576,2097151), (2097152,4194303), (4194304,8388607), (8388608,16777215)]

相反，我想打开文件intervals.txt，并使用其中的内容，即：

1,4
2,2222
2,3
4,7
8,15
16,31
32,63
64,127
128,255
256,511
512,1023
1024,2047
2048,4095
4096,8191
8192,16383
16384,32767
32768,65535
65536,131071
131072,262143
262144,524287
524288,1048575
1048576,2097151
2097152,4194303
4194304,8388607
8388608,16777215

如何打开intervals.txt文件并使用其内容？里面没有括号，所以我不确定这是否是个问题。此外，这些范围是用换行符而不是逗号来划分的（如上面所示）。你知道吗

作为对@sideffect的响应，您的代码将输出以下内容：

[(1-4
), (1024-2047
), (1048576-2097151
), (128-255
), (131072-262143
), (16-31
), (16384-32767
), (2-2222
), (2-3
), (2048-4095
), (2097152-4194303
), (256-511
), (262144-524287
), (32-63
), (32768-65535
), (4-7
), (4096-8191
), (4194304-8388607
), (512-1023
), (524288-1048575
), (64-127
), (65536-131071
), (8-15
), (8192-16383
), (8388608-16777215)]
[(8388608-16777215), (1-8388607
)]

这是应该输出的内容：

[(1-4), (2-3), (2-2222), (4-7), (8-15), (16-31), (32-63), (64-127), (128-255), (256-511), (512-1023), (1024-2047), (2048-4095), (4096-8191), (8192-16383), (16384-32767), (32768-65535), (65536-131071), (131072-262143), (262144-524287), (524288-1048575), (1048576-2097151), (2097152-4194303), (4194304-8388607), (8388608-16777215)]
[(1-4095), (4096-8191), (8192-16383), (16384-32767), (32768-65535), (65536-131071), (131072-262143), (262144-524287), (524288-1048575), (1048576-2097151), (2097152-4194303), (4194304-8388607), (8388608-16777215)]

Answer 1

查看here了解如何打开文件

Q1:如何打开间隔.txt文件并使用其内容？

itervals = []
# you can use `open` function to read from file 
with open("intervals.txt") as f:
     for line in f:
         # read line by line & append to make the list
         # NOTE: a space is also read in line, try strip function to remove it
         # to lazy check, uncomment below code, it will print length of line string
         # print len(line)
         itervals.append(line.split(','))

Q2.里面没有括号，这是问题吗？

不，python不会读取文本文件作为它的数据结构，你的意思是元组，它是你的脚本，需要进一步的数据转换进行修改，在上面的代码中我希望你有一个想法，阅读一行一行的文件，从那里你可以使用可用的python函数来处理字符串到你需要的格式