1、read
将整个文件读取成一个字符串
2、f
for line in f:
每次读取一行
3、readline
line = f.readline()
while line:
print(line.strip())
line = f.readline()
每次读取一行
4、readlines
for line in f.readlines():
print(line.strip())
每次读取一行
原文：https://www.cnblogs.com/liujianing/p/13435218.html