Python读取文件内容的三种常用方式及效率比较

def one():
  start = time.clock()
  fo = open(file,'r')
  fc = fo.readlines()
  num = 0
  for l in fc:
    tup = l.rstrip('\n').rstrip().split('\t')
    num = num+1
  fo.close()
  end = time.clock()
  print end-start
  print num

def two():
  start = time.clock()
  num = 0
  with open(file, 'r') as f:
    for l in f:
      tup = l.rstrip('\n').rstrip().split('\t')
      num = num+1
  end = time.clock()
  times = (end-start)
  print times
  print num

def three():
  start = time.clock()
  fo = open(file,'r')
  l = fo.readline()
  num = 0
  while l:
    tup = l.rstrip('\n').rstrip().split('\t')
    l = fo.readline()
    num = num+1
  end = time.clock()
  print end-start
  print num