# 1、文件路径:d:xxx.txt
# 绝对路径:从根目录开始
# 想对路径:当前文件下
# 2、编码方式:utf-8/gbk...
# 3、操作方式:只读。只写。追加、读写、写读.....
f=open('d:mod.txt',mode='r',encoding='utf-8') content=f.read() print(content) f.close()
# byte类型:rb
# byte类型:rb f=open('公共',mode='rb') content=f.read() print(content) f.close()
b'xe5x93x88xe5x93x88xe5x93x88xe5x93x88'
#只写:w
f=open('log',mode='w',encoding='utf-8') f.write('骑兵步兵') f.close()
#现将源文件的内容删除,再写
f=open('log',mode='w',encoding='utf-8') f.write('快看看') f.close()
#wb
f=open('log',mode='wb') f.write('快看看'.encode('utf-8')) f.close()
追加
#追加 f=open('log',mode='a',encoding='utf-8') f.write('骑兵步兵') f.close()
ab
#ab f=open('log',mode='ab') f.write('骑兵步兵'.encode('utf-8')) f.close()
#读写
f=open('log',mode='r+',encoding='utf-8') content=f.read() print(content) f.write('big,small') f.close()
#写读
f=open('log',mode='r+',encoding='utf-8') f.write('python9') content=f.read() print(content) f.close()
f=open('log',mode='r+b') content=f.read() print(content) f.write('python9'.encode('utf-8')) f.close()
#写读w+
f=open('log',mode='w+',encoding='utf-8') f.write('python9') print(f.read()) f.close()
#写读a+
f=open('log',mode='a+',encoding='utf-8') f.write('bbbbb') f.seek(0) print(f.read()) f.close()
read
f=open('log',mode='r+',encoding='utf-8') content=f.read(4) print(content) f.close()
f=open('log',mode='r+',encoding='utf-8') # content=f.read(4) #read是按照字符定光标位置 f.seek(6) #seek是按照字节定光标位置的3/6/9. 一个中文是3个字节 content=f.read() print(content) f.close()
光标位置
f=open('log',mode='r+',encoding='utf-8') f.seek(3) print(f.tell()) #告诉你光标位置 # content=f.read() # print(content) f.close()
f=open('log',mode='a+',encoding='utf-8') f.write('啥地方') count = f.tell() f.seek(count-9) content=f.read() print(content) f.close()
f=open('log',mode='r+',encoding='utf-8') print(f.readable()) #是否可读 print(f.writable()) #是否可写 line = f.readline() #一行一行读 line = f.readlines() #每一行当成列表中的一个元素,然后添加到列表中 f.truncate(2) #对原文件进行截取 print(line) f.close()
循环
f=open('log',mode='r+',encoding='utf-8') for i in f: print(i) f.close()
with
with open('log',mode='r+',encoding='utf-8') as f, open('log',mode='r+',encoding='utf-8') as f1: print(f.read(1))
#三次登录验证
# 注册的用户名和密码写入到文件,打印,进入界面登录,
# 三次登录,从文件中读取用户名和密码验证
username = input("Register your username: ") password = input("Register you password: ") with open('register',mode='w',encoding='utf-8') as reg: reg.write('{} {}'.format(username,password)) print('恭喜你,注册成功!!!!') lis = [] i = 0 while i < 3: usn = input("pls your username: ") pwd = input("pls your password: ") with open('register',mode='r+',encoding='utf-8') as reg1: for line in reg1: lis.append(line) if usn == lis[0].strip() and pwd == lis[1].strip(): print('登录成功!!!') break else:print('密码错误!!!!!!') i+=1
str --->byte encode 编码
s = '二哥'
b = s.encode('utf-8')
print(b)
#byte --->str decode 解码
s1 = b.decode('utf-8')
print(s1)
s = 'abf'
b = s.encode('utf-8')
print(b)
#byte --->str decode 解码
s1 = b.decode('gbk')
print(s1)