Detailed explanation of three ways to read file content in Python and efficiency comparison

This article mainly introduces the three common methods of reading file content in Python and their efficiency comparison. It also gives three common methods of file reading in the form of specific examples and compares and analyzes the reading speed. Friends who need it can Refer to the following

The examples in this article describe three common ways for Python to read file contents. Share it with everyone for your reference, the details are as follows:

The file for this experiment is a 60M file with a total of 392660 lines of content.

Program 1:

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

Run result: 0.812143868027s

Program two:

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

Running time: 0.74222778078

Program three:

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

Running time: 1.02316120797

It can be concluded from the results that program 2 is the fastest.

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