Python读取txt文件

//第一种方法，用readlines，返回一个list
with open(file) as f:
    lines = f.readlines()  //读取txt文件的所有行，每一行为lines[Index]

    for Index in range(1,len(lines)):
        line = lines[Index].strip().split(":")
        print(line[Index])

f.close()


//第二种方法，返回一个list
lines = []
for line in open("data.txt","r"):
    lines.append(line)
    print(line)


//第三种方法，用readline
f = open("data.txt","r")
line = f.readline()

while line:
    line = f.readline()
    line = line[:-1]

f.close()