Python逐行读取文本文件

readline()

with open("readlines.txt") as f:
    line = f.readline()
    while line:
        print(line)
        line = f.readline()

readlines()

with open("readlines.txt","r") as f:
    lines = f.readlines()
    for line in lines:
        print(line)

文件迭代器

with open("readlines.txt") as f:
    for line in f:
        print(line)

fileinput

import fileinput
for line in fileinput.input("readlines.txt"):
    print(line)