python - 如何打开文件并找到最长的一行然后打印出来

Question

这是我到目前为止所做的，但长度函数不起作用。

import string

def main():
    print " This program reads from a file and then prints out the"
    print " line with the longest length the line ,or with the highest sum"
    print " of ASCII values , or the line with the greatest number of words"
    infile = open("30075165.txt","r")
    for line in infile:
        print line
    infile.close()
def length():
    maxlength = 0
    infile = open("30075165.txt","r")
    for line in infile:
        linelength = lengthofline
        if linelength > maxlength:
            #If linelength is greater than maxlength value the new value is linelength
            maxlength = linelength
            linelength = line
    print ,maxlinetext
    infile.close()

Answer 1

对于 Python 2.5 到 2.7.12

print max(open(your_filename, 'r'), key=len)

对于 Python 3 及更高版本

print(max(open(your_filename, 'r'), key=len))