import random
#assii:大写字母：65~90，小写 97~122 数字48-57
tmp = ""
for i in range(6):
    num =random.randrange(1,4)
    if num == 1:
        rad2 = random.randrange(0,10)
        tmp = tmp+str(rad2)
    elif num == 2:
        rad3 = random.randrange(97, 123)
        tmp = tmp + chr(rad3)
    else:
        rad1 = random.randrange(65,91)
        c = chr(rad1)
        tmp = tmp + c
print(tmp)

class TextIOWrapper(_TextIOBase):
    """
    Character and line based layer over a BufferedIOBase object, buffer.
    
    encoding gives the name of the encoding that the stream will be
    decoded or encoded with. It defaults to locale.getpreferredencoding(False).
    
    errors determines the strictness of encoding and decoding (see
    help(codecs.Codec) or the documentation for codecs.register) and
    defaults to "strict".
    
    newline controls how line endings are handled. It can be None, ‘‘,
    ‘\n‘, ‘\r‘, and ‘\r\n‘.  It works as follows:
    
    * On input, if newline is None, universal newlines mode is
      enabled. Lines in the input can end in ‘\n‘, ‘\r‘, or ‘\r\n‘, and
      these are translated into ‘\n‘ before being returned to the
      caller. If it is ‘‘, universal newline mode is enabled, but line
      endings are returned to the caller untranslated. If it has any of
      the other legal values, input lines are only terminated by the given
      string, and the line ending is returned to the caller untranslated.
    
    * On output, if newline is None, any ‘\n‘ characters written are
      translated to the system default line separator, os.linesep. If
      newline is ‘‘ or ‘\n‘, no translation takes place. If newline is any
      of the other legal values, any ‘\n‘ characters written are translated
      to the given string.
    
    If line_buffering is True, a call to flush is implied when a call to
    write contains a newline character.
    """
    def close(self, *args, **kwargs): # real signature unknown
        关闭文件
        pass

    def fileno(self, *args, **kwargs): # real signature unknown
        文件描述符  
        pass

    def flush(self, *args, **kwargs): # real signature unknown
        刷新文件内部缓冲区
        pass

    def isatty(self, *args, **kwargs): # real signature unknown
        判断文件是否是同意tty设备
        pass

    def read(self, *args, **kwargs): # real signature unknown
        读取指定字节数据
        pass

    def readable(self, *args, **kwargs): # real signature unknown
        是否可读
        pass

    def readline(self, *args, **kwargs): # real signature unknown
        仅读取一行数据
        pass

    def seek(self, *args, **kwargs): # real signature unknown
        指定文件中指针位置
        pass

    def seekable(self, *args, **kwargs): # real signature unknown
        指针是否可操作
        pass

    def tell(self, *args, **kwargs): # real signature unknown
        获取指针位置
        pass

    def truncate(self, *args, **kwargs): # real signature unknown
        截断数据，仅保留指定之前数据
        pass

    def writable(self, *args, **kwargs): # real signature unknown
        是否可写
        pass

    def write(self, *args, **kwargs): # real signature unknown
        写内容
        pass

    def __getstate__(self, *args, **kwargs): # real signature unknown
        pass

    def __init__(self, *args, **kwargs): # real signature unknown
        pass

    @staticmethod # known case of __new__
    def __new__(*args, **kwargs): # real signature unknown
        """ Create and return a new object.  See help(type) for accurate signature. """
        pass

    def __next__(self, *args, **kwargs): # real signature unknown
        """ Implement next(self). """
        pass

    def __repr__(self, *args, **kwargs): # real signature unknown
        """ Return repr(self). """
        pass

    buffer = property(lambda self: object(), lambda self, v: None, lambda self: None)  # default

    closed = property(lambda self: object(), lambda self, v: None, lambda self: None)  # default

    encoding = property(lambda self: object(), lambda self, v: None, lambda self: None)  # default

    errors = property(lambda self: object(), lambda self, v: None, lambda self: None)  # default

    line_buffering = property(lambda self: object(), lambda self, v: None, lambda self: None)  # default

    name = property(lambda self: object(), lambda self, v: None, lambda self: None)  # default

    newlines = property(lambda self: object(), lambda self, v: None, lambda self: None)  # default

    _CHUNK_SIZE = property(lambda self: object(), lambda self, v: None, lambda self: None)  # default

    _finalizing = property(lambda self: object(), lambda self, v: None, lambda self: None)  # default

3.x

#!/usr/bin/env python
# -*- coding:utf-8 -*-

####基本操作方法
#默认是只读模式，默认编码方式：utf-8
# f = open(‘ha.log‘)
# data = http://www.mamicode.com/f.read()
# f.close()
# print(data)
#只读，r
# f = open("ha.log","r")
# f.write("asdfs")
# f.close()
#只写，w  ---存在就清空，打开就清空
# f = open("ha1.log","w")
# f.write("Hello world!")
# f.close()
#只写 ，x
# f = open("ha2.log","x")
# f.write("Hello world1!")
# f.close()
#追加  a,不可读
# f = open("ha2.log","a")
# f.write("\nHello world! a mode")
# f.close()

### 字节的方式打开
## 默认读取到的都是字节,不用设置编码方式
## 1、 只读，rb
# f = open("ha.log","rb")
# data =http://www.mamicode.com/f.read()
# f.close()
# print(type(data))
# print(data)
# print(str(data,encoding="utf-8"))

#2 只写，wb
# f = open("ha.log","wb")
# f.write(bytes("中国",encoding="utf-8"))
# f.close()


### r+ ,w+,x+，a+

#r+
# f = open("ha.log",‘r+‘,encoding="utf-8")
# print(f.tell())
# data = http://www.mamicode.com/f.read()
# print(type(data),data)
# f.write("德国人")
# print(f.tell())
# data = http://www.mamicode.com/f.read()
# f.close()

#w+  先清空，之后写入的可读，写后指针到最后
# f = open("ha.log","w+",encoding="utf-8")
# f.write("何莉莉")
# f.seek(0)  # 指针调到最后
# data = http://www.mamicode.com/f.read()
# f.close()
# print(data)

#  x+  功能类似w+，区别：若文件存在即报错


#a +    打开的同时指针到最后
f = open("ha.log","a+",encoding="utf-8")
print(f.tell())
f.write("SB")
print(f.tell())
data = f.read()
print(data)
f.seek(0)  
data = f.read()
print(data)
print(type(data))
print(type(f))
f.close()