如何在 Python 脚本中使用文件？

Question

我正在编写 Python 脚本，但似乎无法理解它的最后一部分。这是代码：

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，正如您在这一行中看到的那样：

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 文件并改用其内容？其中没有任何括号，所以我不确定这是否会成为问题。此外，范围由换行符而不是逗号分隔（如上所示）。

作为对@sideeffect 的回应，这是您的代码输出的内容：

[(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

检查 here 了解如何打开文件

问题 1：如何打开 intervals.txt 文件并改用其内容？

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.There 里面没有任何括号，这是个问题吗？

不，python 不会读取文本文件作为其数据结构，括号中的意思是元组，它是您的脚本，需要修改以进行进一步的数据转换，在上面的代码中，我希望您得到一个逐行读取文件的想法，从那里您可以使用可用的 python 函数将字符串处理为您需要的格式

Answer 2

我认为这将是满足您要求的更好解决方案

data = [line.strip() for line in open("sample.txt", 'r')]
splits=[line.split(",") for line in data]
x=[int(i[0]) for i in splits]
y=[int(i[1]) for i in splits]
final=[tuple([i,j]) for i,j in zip(x,y)]
print final

你会得到这样的结果：

[(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)]

如何在 Python 脚本中使用文件？

How to use file in Python script?

python

python-2.6