day09总结

with 上下文管理

# f = open(r"文件路径", mode="rt", encoding="utf-8")
# data = f.read(内容)  # f.write(内容)
# f.close()
 
# with open('今日内容.txt',mode='rt',encoding='utf-8') as f1:
#     data = f1.read()
#     print(data)
 
#     # 自动调用f1.close()回收操作系统
 
with open('今日内容.txt', mode='rt', encoding='utf-8') as f1, \
        open('a.txt', mode='rt', encoding='utf-8') as f2:
    print('文件1的内容'.center(50, '#'))
    data = f1.read()
    print(data)
 
    print('文件2的内容'.center(50, '#'))
    data = f2.read()
    print(data)
 
    # 自动调用f1.close()、f2.close()回收操作系统
b 模式处理文件

# bytes
# with open('a.txt',mode='rt') as f:
#     data=f.read()
#     print(data)
#     print(type(data))
#
 
# # t模式只能用于读文本文件
# with open('a.jpg',mode='rt',encoding='utf-8') as f:
#     data=f.read()
#     print(data)
#     print(type(data))
#
# # 图片<---------jpg-------二进制数
# # 字符<---------utf-8-------二进制数
 
# b模式可能用于读所有的文件
# with open('a.jpg',mode='rb') as f:
#     data=f.read()
#     print(data)
#     print(type(data))
 
# with open('a.jpg', mode='rb') as f:
#     data = f.read()
#     print(data.decode("utf-8"))
# print(type(data))
 
# b模式
# 二进制数
 
# t模式是帮我们解码了
# 字符<---------utf-8-------二进制数
 
# 补充字符编码解码的知识
'''
# user = input('>>: ')  # user="林海峰"
user = "林海峰"
 
# 编码操作：
# 字符串===utf-8===》bytes
res=user.encode("utf-8")
print(res)
print(type(res))
 
# 基于网络发送数据(res)
 
# 解码操作：
# bytes====》utf-8=====》字符串
print(res.decode("utf-8"))
'''
 
# with open('a.jpg', mode='rb') as src_f, \
#         open('b.jpg', mode='wb') as dst_f:
#     # data = src_f.read()
#     # dst_f.write(data)
#
#     for line in src_f: # line=文件中的2行内容
#         dst_f.write(line)
 
# with open('b.txt', mode='wb') as f:
#     user = "林海峰"
#     res=user.encode('utf-8')
#     f.write(res)
 
with open('b.txt', mode='wt', encoding="utf-8") as f:
    user = "林海峰"
    f.write(user)
+ 模式处理文件

# 可读可写模式,可以省略t，默认就是t模式，读写都是以字符串为单位
# r+t
# w+t
# a+t
 
# 可读可写模式，b模式下读写都是以bytes二进制为单位
# r+b
# w+b
# a+b
 
# with open('b.txt',mode='r+t',encoding='utf-8') as f:
#     print(f.read())
#     f.write("abcdefg")
 
# with open('b.txt',mode='w+t',encoding='utf-8') as f:
#     f.write("我爱你中国")
#     print(f.read())
 
# with open('b.txt',mode='a+t',encoding='utf-8') as f:
#     f.write("我爱你中国")
#     print(f.read())

文件其他操作

# with open('b.txt', mode='rt', encoding='utf-8') as f:
    # line1=f.readline()
    # line2=f.readline()
    # line3=f.readline()
    # line4=f.readline()
    # print(line1,end="")
    # print(line2,end="")
    # print(line3,end="")
    # print(line4,end="")
 
    # for line in f:
    #     print(line)
 
    # l = []
    # for line in f:
    #     l.append(line)
 
    # l = f.readlines()
    # print(l)
 
# with open('b.txt', mode='wt', encoding='utf-8') as f:
    # f.write("1111\n2222\n333\n")
 
    # lines=["1111\n","222\n","333\n"]
 
    # for line in lines:
    #     f.write(line)
 
    # f.writelines(lines)
 
    # f.writelines({'k1':111,'k2':222,"k3":3333})
    # f.writelines({'k1':111,1:44444,'k2':222,"k3":3333}) # 报错
 
    # f.writelines("hello")
    # f.write("hello")
 
with open(r'b.txt', mode='wt', encoding='utf-8') as f:
    # print(f.name) # 获取的是文件的路径
    f.write('哈哈哈\n')
    # f.flush()