python中循环读入的文件 python 循环读取

1. 普通读取f = open()

# 打开文件，循环读取
def read(filename):
	f = open(filename, 'r')
	for line in f:
	    print(line)

2. with上下文读取

def read(filename):
	with open(filename, 'r') as f:
		for line in f:
	    	print(line)

3. readline()读取，通过 while循环+not 判断是否读完

def read(filename):
	with open(filename, 'r') as f:
	    while True:
	        line = f.readline()
	        if not line:  
	            break
	        else:
	            print(line)

4. readlines()读取

def read(filename):
	with open(filename, 'r') as f:
	    lines:list = f.readlines()  # 得到由每一行内容构成的list
	    print(lines)

5. 使用生成式

def read(filename):
	with open(filename, 'r') as f:
	    items = [item for item in f.readlines()]  # 使用生成式
	    for item in items:
	        print(item)

open函数的读取mode常用参数有：r，rb(以二进制形式读取)，r+等