python怎么读写文件

python怎么读写文件？

读取操作

# 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)

写入操作

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) + '
')

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