Python读取实时数据流示例-创新互联

1、#coding:utf-8

chose = [
  ('foo',1,2),
  ('bar','hello'),
  ('foo',3,4)
]

def do_foo(x,y):
  print('foo',x,y)

def do_bar(s):
  print('bar',s)

for tag,*args in chose:
  if tag == 'foo':
    do_foo(*args)

  elif tag == 'bar':
    do_bar(*args)

line = 'nobody:*:-2:-2:Unprivileged User:/var/empty:/usr/bin/false'

uname,*fields,homedir,sh = line.split(':')
print(sh)
from collections import deque
def search(lines, pattern, history=5):
  previous_lines = deque(maxlen=history)
  for li in lines:
    if pattern in li:
      yield li, previous_lines
    previous_lines.append(li)


# Example use on a file
if __name__ == '__main__':
  with open(r'./somefiles.py') as f:
    for line, prevlines in search(f, 'python', 5):
      for pline in prevlines:
        print(pline, end='')
      print(line, end='')
      print('-' * 20)

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