如何打开文件并找到最长的一行，然后打印出来

如何解决如何打开文件并找到最长的一行，然后打印出来

对于Python 2.5至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))

解决方法

到目前为止，这是我所做的，但是length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()