难以在python列表中选择元素

Question

I've been trying to clean a txt file, and I'm almost done with it. I have a problem with the list - I cannot select elements of the list I created in process_line() , at the line with ### .

Below is a snippet of the code;

def process_line(line):
    # receiving a line or string as function
    # argument and replacing '-' 'D00-D09' & 'F00-F09' to '' if it exists
    line = re.sub('D0+\d|F0+\d|-', '', line)
    seq = str(line.split())
    line = re.sub('\'|\\[|\\]|,', '', seq)
    ###  line = (seq[0] + '|' seq[3] + '-' seq[5]) # this is for shorter lines
    print line
    return line  + '\n'

Here is a sample set of data after removing some unwanted data

12asA   1  A    4  A  330 
12asB   1  B    4  B  330 
12caA   1  A    5  A  260 
12e8H   1  H    1  H  113   1  H  114  H  212   H  213  H  214  (2)
12e8L   1  L    1  L  107   1  L  108  L  211   L  212  L  214  (3)   

I was hoping to achieve a format like this, however I need to learn how to extract the elements needed - so I can rearrange the data to the required format:

12asA|4-330
12asB|4-330
12caA|5-260
12e8H|1-113,114-212
12e8l|1-107, 108-211 

instead of getting eg. 23reA|1-14,56-65 I get something [2|1-A]

Answer 1

I'm not really sure what you're trying to do here, but this appears to match your desired output:

import re

data = '''
12asA   1  A    4  A  330  
12asB   1  B    4  B  330 
12caA   1  A    5  A  260 
12e8H   1  H    1  H  113   1  H  114  H  212   H  213  H  214  (2)
12e8L   1  L    1  L  107   1  L  108  L  211   L  212  L  214  (3)
'''
lines = filter(None, data.split('\n')) # filter to remove blank lines

def process_line(line):
    line = re.sub(r'D0\d|F0\d|-', '', line)
    for char in "'[],":
        line = line.replace(char, '')
    seq = line.split()
    if len(seq) == 6:
        return '{}|{}-{}'.format(seq[0], seq[3], seq[5])
    elif len(seq) == 16:
        return '{}|{}-{},{}-{}'.format(seq[0], seq[3], seq[5], seq[8], seq[10])

result = [process_line(line) for line in lines]
for r in result:
    print(r)

Output:

12asA|4-330
12asB|4-330
12caA|5-260
12e8H|1-113,114-212
12e8L|1-107,108-211

The following regex in your code:

line = re.sub('\'|\\[|\\]|,', '', seq)

is a real mess. I have replaced it with a sequence of simple str.replace calls instead. In future, when writing regular expressions, please use raw strings (eg r'...' ) for readability and to help you avoid bugs.

If you only added that line to get rid of the brackets, commas, and quotes introduced by calling str(line.split()) (rather than to deal with garbage in your original data), you should go ahead and remove its equivalent in the code I posted, because it does nothing useful.