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  1. import sys
  2.  
  3. lines_to_repeat = [5, 6, 7]
  4.  
  5. memory = []
  6. for i, line in enumerate(sys.stdin, 1):
  7.     if i in lines_to_repeat:
  8.         memory.append(line)
  9.     elif memory:
  10.         sys.stdout.write(''.join(memory))
  11.         memory = []
  12.     sys.stdout.write(line)
Success #stdin #stdout 0.01s 7200KB
comments (?)
stdin 
 Heading 
 Heading2 
    
 Heading3 
    
 Line1
 Line2
    
 Line3
 Line4
stdout 
 Heading 
 Heading2 
    
 Heading3 
    
 Line1
 Line2
    
 Line1
 Line2
    
 Line3
 Line4
https://ideone.com/LGOBHX
language:
Python (cpython 2.7.16)
created:
4 years ago
visibility:
secret

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