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) + '
')