python 逐行读取文件处理

1.readline读取整个文件

input = open('File','r')  
while True:  
    line = input.readline()  
    if not line:  
        break  
input.close()  

2.python2 next()

input = open('File','r')  
for line in input:
    line = line1.strip("\n")
input.close()  

3.python3 next()

input = open('File','r')  
for line in input:
    line = line1.strip("\n")
input.close()  

参考文章：
Python逐行读取文件，到最后一行结束