Python读取文件内容的三种方式并比较

Posted 2020-08-09

本次实验的文件是一个60M的文件，共计392660行内容。

程序一：

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

运行结果：0.812143868027s

程序二：

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

运行时间：0.74222778078

程序三：

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

运行时间：1.02316120797

由结果可得出，程序二的速度最快。