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import sys
from functools import partial
 
print(sum(chunk.count('\n') for chunk in iter(partial(sys.stdin.read, 1 << 15), '')))
 

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• # 2:   hide show   clone   input   477 days 22 hours ago    Success

  result: Success     time: 0.03s    memory: 6376 kB     returned value: 0

  input:

  #!/usr/bin/env python
  import sys
  
  count = 0
  for line in sys.stdin:
      count += 1
  print(count)
  
  $ pv /tmp/out2.txt | python count-lines-one-by-one.py 
  3.09GB 0:00:13 [ 230MB/s] [=========================================>] 100%            
  65769984
  
  $ pv /tmp/out2.txt | perl -ne'} { print qq($.\n)'
  3.09GB 0:00:13 [ 229MB/s] [=========================================>] 100%            
  65769984
  
  $ pv /tmp/out2.txt | python count-lines.py 
  3.09GB 0:00:04 [ 717MB/s] [=========================================>] 100%            
  65769984
  

  output:

  19
  
• # 1:   hide show   clone   input   477 days 22 hours ago    Success

  result: Success     time: 0.03s    memory: 6376 kB     returned value: 0

  input:

  $ pv out.txt | wc -l
    99MB 0:00:00 [ 840MB/s] [=========================================>] 100%            
  2055312
  
  $ pv out.txt | python count-lines.py
    99MB 0:00:00 [ 660MB/s] [=========================================>] 100%            
  2055312
  

  output:

  7