Python逐行解析带有特殊字符的文件

Question

When reading in a file line-by-line using the classic for line in filename: approach, how do you concatenate each line into one string (or one string per list) based on a specific character symbol (eg, $ ). For example:

My input:

$asdfasdfasdfasdfasdfasdf
ABCSLKDJFLAJSDJLAJSDLFJALJSDLKJLAJLSKDJFLAJSD
LKAJSDLJFALSJDFLJALSJDFLASDLFJLAJSDLFJALSDFAS
LLASJLKDFJLASDFASKLDFLASDFJALSDJFLAJSDLFJALKS
ALKSDJLFKJASLDJFLAJSDLFJALSJDFLJASLDJJASDLFJF
$aWEOUUEWOEUowuerotueworutowueortuo
ABCSLKDJFLAJSDJLAJSDLFJALJSDLKJLAJLSKDJFLAJSD
LKAJSDLJFALoqiweoituoiwueoruweuroouqweoruuqowuieoFAS
LLASJLKDFJLASDFASKLDFLASDFJALSDJFLAJSDLFJALKS
ALKSDJLFKJASLDJFLAJSDLFJALSJDFLJASLDJJASDLFJFsdfs

My desired output:

'ABCSLKDJFLAJSDJLAJSDLFJALJSDLKJLAJLSKDJFLAJSDLKAJSDLJFALSJDFLJALSJDFLASDLFJLAJSDLFJALSDFASLLASJLKDFJLASDFASKLDFLASDFJALSDJFLAJSDLFJALKSALKSDJLFKJASLDJFLAJSDLFJALSJDFLJASLDJJASDLFJF'
'ABCSLKDJFLAJSDJLAJSDLFJALJSDLKJLAJLSKDJFLAJSDLKAJSDLJFALoqiweoituoiwueoruweuroouqweoruuqowuieoFASLLASJLKDFJLASDFASKLDFLASDFJALSDJFLAJSDLFJALKSALKSDJLFKJSLDJFLAJSDLFJALSJDFLJASLDJJASDLFJFsdfs'

OR

['ABCSLKDJFLAJSDJLAJSDLFJALJSDLKJLAJLSKDJFLAJSDLKAJSDLJFALSJDFLJALSJDFLASDLFJLAJSDLFJALSDFASLLASJLKDFJLASDFASKLDFLASDFJALSDJFLAJSDLFJALKSALKSDJLFKJASLDJFLAJSDLFJALSJDFLJASLDJJASDLFJF']
['ABCSLKDJFLAJSDJLAJSDLFJALJSDLKJLAJLSKDJFLAJSDLKAJSDLJFALoqiweoituoiwueoruweuroouqweoruuqowuieoFASLLASJLKDFJLASDFASKLDFLASDFJALSDJFLAJSDLFJALKSALKSDJLFKJSLDJFLAJSDLFJALSJDFLJASLDJJASDLFJFsdfs']

Notice that any lines beginning with the $ symbol were removed and used as the breaking point of string concatenation line-by-line.

Answer 1

You can use regex. re.finditer returns an iterator containing all the desired lines, then you can use a list comprehension and str.replace method to replace the newlines with empty string:

>>> s="""$asdfasdfasdfasdfasdfasdf
... ABCSLKDJFLAJSDJLAJSDLFJALJSDLKJLAJLSKDJFLAJSD
... LKAJSDLJFALSJDFLJALSJDFLASDLFJLAJSDLFJALSDFAS
... LLASJLKDFJLASDFASKLDFLASDFJALSDJFLAJSDLFJALKS
... ALKSDJLFKJASLDJFLAJSDLFJALSJDFLJASLDJJASDLFJF
... $aWEOUUEWOEUowuerotueworutowueortuo
... ABCSLKDJFLAJSDJLAJSDLFJALJSDLKJLAJLSKDJFLAJSD
... LKAJSDLJFALoqiweoituoiwueoruweuroouqweoruuqowuieoFAS
... LLASJLKDFJLASDFASKLDFLASDFJALSDJFLAJSDLFJALKS
... ALKSDJLFKJASLDJFLAJSDLFJALSJDFLJASLDJJASDLFJFsdfs
... """
>>> 
>>> import re
>>> 
>>> li=re.finditer(r'\$[^\n]*([^$]+)',s)
>>> [i.group(1).replace('\n','') for i in li]
['ABCSLKDJFLAJSDJLAJSDLFJALJSDLKJLAJLSKDJFLAJSDLKAJSDLJFALSJDFLJALSJDFLASDLFJLAJSDLFJALSDFASLLASJLKDFJLASDFASKLDFLASDFJALSDJFLAJSDLFJALKSALKSDJLFKJASLDJFLAJSDLFJALSJDFLJASLDJJASDLFJF',
 'ABCSLKDJFLAJSDJLAJSDLFJALJSDLKJLAJLSKDJFLAJSDLKAJSDLJFALoqiweoituoiwueoruweuroouqweoruuqowuieoFASLLASJLKDFJLASDFASKLDFLASDFJALSDJFLAJSDLFJALKSALKSDJLFKJASLDJFLAJSDLFJALSJDFLJASLDJJASDLFJFsdfs']

Answer 2

import io

data = io.StringIO('''$asdfasdfasdfasdfasdfasdf
ABCSLKDJFLAJSDJLAJSDLFJALJSDLKJLAJLSKDJFLAJSD
LKAJSDLJFALSJDFLJALSJDFLASDLFJLAJSDLFJALSDFAS
LLASJLKDFJLASDFASKLDFLASDFJALSDJFLAJSDLFJALKS
ALKSDJLFKJASLDJFLAJSDLFJALSJDFLJASLDJJASDLFJF
$aWEOUUEWOEUowuerotueworutowueortuo
ABCSLKDJFLAJSDJLAJSDLFJALJSDLKJLAJLSKDJFLAJSD
LKAJSDLJFALoqiweoituoiwueoruweuroouqweoruuqowuieoFAS
LLASJLKDFJLASDFASKLDFLASDFJALSDJFLAJSDLFJALKS
ALKSDJLFKJASLDJFLAJSDLFJALSJDFLJASLDJJASDLFJFsdfs''')


strings = []
strg = ''
for line in data:
    if line.startswith('$'):
        if strg:
            strings.append(strg)
            strg = ''
        continue
    else:
        strg += line.strip()
if strg:
    strings.append(strg)   

print(strings)