I want to add string startswith "AA" to the end of next line like this (that have many lines in text)

input:

AA

1 A B C 

2 D E F 

AA

3 G H I 

output:

1 A B C AA

2 D E F 

3 G H I AA

CodePudding user response：

you need to keep two lists, a temporary one to keep all your string that start with "AA" and other for the output and fill them accordingly

>>> text="""AA

1 A B C

2 D E F

AA

3 G H I"""

>>> output=[]
>>> temp=[]
>>> for line in text.splitlines():
        line = line.strip() #remove trailing while spaces
        if not line:
            continue #ignore empty lines
        if line.startswith("AA"):
            temp.append(line)
        else:
            if temp: #concatenate our temp list if there anything there
                line  = " "   " ".join(temp)
                temp.clear() 
            output.append(line)
    
            
>>> print("\n".join(output))
1 A B C AA
2 D E F
3 G H I AA
>>> 

CodePudding user response：

import sys
checker="AA" 
raw=sys.stdin.readlines() # paste test from clipboard and ctrl   z input
lines=list(map(str.strip,raw))
result=[]
for i in range(0,len(lines)-1):
    if lines[i] == checker:
        result.append(lines[i 1] lines[i])
    else:
        pass
result_str='\n'.join(result)
print(result_str)

I hope it wiil work for you.