python怎么读写文件

# 一次性读取整个文件内容

with open('致橡树.txt', 'r', encoding='utf-8') as f:

    print(f.read())

# 通过for-in循环逐行读取

with open('致橡树.txt', mode='r') as f:

    for line in f:

        print(line, end='')

        time.sleep(0.5)

print()

# 读取文件按行读取到列表中

with open('致橡树.txt') as f:

    lines = f.readlines()

print(lines)

import csv

class Teacher(object):

    def __init__(self, name, age, title):

        self.__name = name

        self.__age = age

        self.__title = title

        self.__index = -1

    @property

    def name(self):

        return self.__name

    @property

    def age(self):

        return self.__age

    @property

    def title(self):

        return self.__title

filename = 'teacher.csv'

teachers = [Teacher('骆昊', 38, '叫兽'), Teacher('狄仁杰', 25, '砖家')]

try:

    with open(filename, 'w') as f:

        writer = csv.writer(f)

        for teacher in teachers:

            writer.writerow([teacher.name, teacher.age, teacher.title])

except BaseException as e:

    print('无法写入文件:', filename)

else:

    print('保存数据完成!')

with open('prime.txt', 'w') as f:

    for num in range(2, 100):

        f.write(str(num) + '\n')