def　func（args）：args.appand(123)
li=[11,22,33]
func(li)
print(li)
[11,22,33,123]

a=abs(-2)
print(a)
2

li=[]
a=ascii(li)
print(a)
[]

a=bin(6)
print(a)
0b110

a=oct(6)
print(a)
0o6

a=int(6)
print(a)
6

a=hex(6)
print(a)
0x6

a=hex(6)
print(a)
b=int("0x6",base=16)
print(b)
0x6
6

a=bool("")
print(a)
False

#字符串转字节
a=bytes("中国人",encoding="utf-8")
print(a)
b'\xe4\xb8\xad\xe5\x9b\xbd\xe4\xba\xba'#字节转字符串
b=str(a,encoding="utf-8")
print(b)
中国人

a=chr(66)
print(a)
B

a=ord("a")
print(a)
97

import random
a=random.randrange(65,90)
print(a)

import random
b=""
for i in range(6):c=random.randrange(0,4)if c==1 or c==3:d=random.randrange(0,9)b=b+str(d)else:a=random.randrange(65,80)b=b+chr(a)
print(b)

def  f1()reture 123
a=callable(f1)print(a)
True

a=dic(str())
print(a)
['__add__', '__class__', '__contains__', '__delattr__', '__dir__', '__doc__', '__eq__', '__format__', '__ge__', '__getattribute__', '__getitem__', 

a=divmod(10,3)
print(a)
(3, 1)

a="1+2"
b=eval(a)
print(b)
3

b=eval("a+2",{"a":1})   #eval后可以接收参数（字典），用来申明变量
print(b)
3

exec("for i in range(4):print(i)")
0
1
2
3

def z(a):if a>3:return Trueelse:return False
ret=filter(z,[1,2,3,4,5,])
print(ret)
for i in ret:print(i)
<filter object at 0x0000001EA85B9550>　　　　#此处相当于range()  不直接输出浪费内存
4
5

def z(a):return a+12
ret=filter(z,[1,2,3,4,5,])
print(ret)
for i in ret:print(i)
<filter object at 0x0000000F9EE49550>
1
2
3
4
5

def z(a):return a+12
ret=map(z,[1,2,3,4,5,])
print(ret)
for i in ret:print(i)
<map object at 0x00000082DC909550>
13
14
15
16
17

def z():name="123"print(globals())print(locals())
z()
{'z': <function z at 0x000000751D4EAC80}
{'name': '123'}

dict={"qqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqq":1}
a=hash("qqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqq")
print(a)
936761249792483134

li=list（）
r=isinstance(li,list)
print(r)
True

a=iter([1,2,3])
print(a)
b1=next(a)
print(b1)
b2=next(a)
print(b2)
b3=next(a)
print(b3)
<list_iterator object at 0x0000005D5C239550>
1
2
3

a=pow(2,10)
print(a)
1024

a=[1,2,3,4]
b=[5,6,7,8]
c=(1,2,3,4)
d=zip(a,b,c)
print(d)
for i in d:print(i)
<zip object at 0x000000DB794F0E88>
(1, 5, 1)
(2, 6, 2)
(3, 7, 3)
(4, 8, 4)

a=[1,2,3,4,1212,13,4,56,7]
b=a.sort()　　　　　　#执行sort方法
print(a)
[1, 2, 3, 4, 4, 7, 13, 56, 1212]

a=[1,2,3,4,1212,13,4,56,7]
b=sorted(a)　　　　#执行sort方法得到新值
print(b)
[1, 2, 3, 4, 4, 7, 13, 56, 1212]

char=['赵',"123", "1", "25", "65","679999999999","a","B","alex","c" ,"A", "_", "ᒲ",'a钱','孙','李',"余", '佘',"佗", "㽙", "铱", "钲钲㽙㽙㽙"]new_chat = sorted(char)
print(new_chat)
for i in new_chat:print(bytes(i, encoding='utf-8'))
['1', '123', '25', '65', '679999999999', 'A', 'B', '_', 'a', 'alex', 'a钱', 'c', 'ᒲ', '㽙', '佗', '佘', '余', '孙', '李', '赵', '钲钲㽙㽙㽙', '铱']
b'1'
b'123'
b'25'
b'65'　　　　　　　　　　b'679999999999'　　　　#字符串中是数字的按数字大小排序（从左边第一位开始）
b'A'
b'B'
b'_'
b'a'
b'alex'
b'a\xe9\x92\xb1'
b'c'　　　　　　　　　　#大写的字母排到前面，小写的在后面，再看第一位（左边第一位）
b'\xe1\x92\xb2'
b'\xe3\xbd\x99'
b'\xe4\xbd\x97'
b'\xe4\xbd\x98'
b'\xe4\xbd\x99'
b'\xe5\xad\x99'
b'\xe6\x9d\x8e'
b'\xe8\xb5\xb5'
b'\xe9\x92\xb2\xe9\x92\xb2\xe3\xbd\x99\xe3\xbd\x99\xe3\xbd\x99'
b'\xe9\x93\xb1'　　　#数字按照xe后跟的先排

文件句柄 = open('文件路径', '模式')

a=open("334.txt","r+" ,encoding="utf-8")
b=a.read()
a.write("fgh")
a.close()
print(b)
123

a=open("334.txt","r+",encoding="utf-8")
a.write("fgh")
c=a.read()
a.close()
print(c)

a=open("334.txt","w+")
print(a.tell())
a.write("asd")
a.seek(0)
b=a.read()
a.close()
print(b)

class file(object)def close(self): # real signature unknown; restored from __doc__关闭文件"""close() -> None or (perhaps) an integer.  Close the file.Sets data attribute .closed to True.  A closed file cannot be used forfurther I/O operations.  close() may be called more than once withouterror.  Some kinds of file objects (for example, opened by popen())may return an exit status upon closing."""def fileno(self): # real signature unknown; restored from __doc__文件描述符  """fileno() -> integer "file descriptor".This is needed for lower-level file interfaces, such os.read()."""return 0    def flush(self): # real signature unknown; restored from __doc__刷新文件内部缓冲区""" flush() -> None.  Flush the internal I/O buffer. """passdef isatty(self): # real signature unknown; restored from __doc__判断文件是否是同意tty设备""" isatty() -> true or false.  True if the file is connected to a tty device. """return Falsedef next(self): # real signature unknown; restored from __doc__获取下一行数据，不存在，则报错""" x.next() -> the next value, or raise StopIteration """passdef read(self, size=None): # real signature unknown; restored from __doc__读取指定字节数据"""read([size]) -> read at most size bytes, returned as a string.If the size argument is negative or omitted, read until EOF is reached.Notice that when in non-blocking mode, less data than what was requestedmay be returned, even if no size parameter was given."""passdef readinto(self): # real signature unknown; restored from __doc__读取到缓冲区，不要用，将被遗弃""" readinto() -> Undocumented.  Don't use this; it may go away. """passdef readline(self, size=None): # real signature unknown; restored from __doc__仅读取一行数据"""readline([size]) -> next line from the file, as a string.Retain newline.  A non-negative size argument limits the maximumnumber of bytes to return (an incomplete line may be returned then).Return an empty string at EOF."""passdef readlines(self, size=None): # real signature unknown; restored from __doc__读取所有数据，并根据换行保存值列表"""readlines([size]) -> list of strings, each a line from the file.Call readline() repeatedly and return a list of the lines so read.The optional size argument, if given, is an approximate bound on thetotal number of bytes in the lines returned."""return []def seek(self, offset, whence=None): # real signature unknown; restored from __doc__指定文件中指针位置"""seek(offset[, whence]) -> None.  Move to new file position.Argument offset is a byte count.  Optional argument whence defaults to
(offset from start of file, offset should be >= 0); other values are 1(move relative to current position, positive or negative), and 2 (moverelative to end of file, usually negative, although many platforms allowseeking beyond the end of a file).  If the file is opened in text mode,only offsets returned by tell() are legal.  Use of other offsets causesundefined behavior.Note that not all file objects are seekable."""passdef tell(self): # real signature unknown; restored from __doc__获取当前指针位置""" tell() -> current file position, an integer (may be a long integer). """passdef truncate(self, size=None): # real signature unknown; restored from __doc__截断数据，仅保留指定之前数据"""truncate([size]) -> None.  Truncate the file to at most size bytes.Size defaults to the current file position, as returned by tell()."""passdef write(self, p_str): # real signature unknown; restored from __doc__写内容"""write(str) -> None.  Write string str to file.Note that due to buffering, flush() or close() may be needed beforethe file on disk reflects the data written."""passdef writelines(self, sequence_of_strings): # real signature unknown; restored from __doc__将一个字符串列表写入文件"""writelines(sequence_of_strings) -> None.  Write the strings to the file.Note that newlines are not added.  The sequence can be any iterable objectproducing strings. This is equivalent to calling write() for each string."""passdef xreadlines(self): # real signature unknown; restored from __doc__可用于逐行读取文件，非全部"""xreadlines() -> returns self.For backward compatibility. File objects now include the performanceoptimizations previously implemented in the xreadlines module."""pass

class TextIOWrapper(_TextIOBase):"""Character and line based layer over a BufferedIOBase object, buffer.encoding gives the name of the encoding that the stream will bedecoded or encoded with. It defaults to locale.getpreferredencoding(False).errors determines the strictness of encoding and decoding (seehelp(codecs.Codec) or the documentation for codecs.register) anddefaults 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 isenabled. Lines in the input can end in '\n', '\r', or '\r\n', andthese are translated into '\n' before being returned to thecaller. If it is '', universal newline mode is enabled, but lineendings are returned to the caller untranslated. If it has any ofthe other legal values, input lines are only terminated by the givenstring, and the line ending is returned to the caller untranslated.* On output, if newline is None, any '\n' characters written aretranslated to the system default line separator, os.linesep. Ifnewline is '' or '\n', no translation takes place. If newline is anyof the other legal values, any '\n' characters written are translatedto the given string.If line_buffering is True, a call to flush is implied when a call towrite contains a newline character."""def close(self, *args, **kwargs): # real signature unknown关闭文件passdef fileno(self, *args, **kwargs): # real signature unknown文件描述符  passdef flush(self, *args, **kwargs): # real signature unknown刷新文件内部缓冲区passdef isatty(self, *args, **kwargs): # real signature unknown判断文件是否是同意tty设备passdef read(self, *args, **kwargs): # real signature unknown读取指定字节数据passdef readable(self, *args, **kwargs): # real signature unknown是否可读passdef readline(self, *args, **kwargs): # real signature unknown仅读取一行数据passdef seek(self, *args, **kwargs): # real signature unknown指定文件中指针位置passdef seekable(self, *args, **kwargs): # real signature unknown指针是否可操作passdef tell(self, *args, **kwargs): # real signature unknown获取指针位置passdef truncate(self, *args, **kwargs): # real signature unknown截断数据，仅保留指定之前数据passdef writable(self, *args, **kwargs): # real signature unknown是否可写passdef write(self, *args, **kwargs): # real signature unknown写内容passdef __getstate__(self, *args, **kwargs): # real signature unknownpassdef __init__(self, *args, **kwargs): # real signature unknownpass@staticmethod # known case of __new__def __new__(*args, **kwargs): # real signature unknown""" Create and return a new object.  See help(type) for accurate signature. """passdef __next__(self, *args, **kwargs): # real signature unknown""" Implement next(self). """passdef __repr__(self, *args, **kwargs): # real signature unknown""" Return repr(self). """passbuffer = property(lambda self: object(), lambda self, v: None, lambda self: None)  # defaultclosed = property(lambda self: object(), lambda self, v: None, lambda self: None)  # defaultencoding = property(lambda self: object(), lambda self, v: None, lambda self: None)  # defaulterrors = property(lambda self: object(), lambda self, v: None, lambda self: None)  # defaultline_buffering = property(lambda self: object(), lambda self, v: None, lambda self: None)  # defaultname = property(lambda self: object(), lambda self, v: None, lambda self: None)  # defaultnewlines = 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

truncate(self, *args, **kwargs): 截断数据，仅保留指定之前数据  依赖于指针的位置
a=open("334.txt","r+")
print(a.tell())
print(a.seek(5))
a.truncate()
a.close() 0 5　　　　　　　　#用于截取文件内容中前五个字符串的内容

f=open（"111.py',"r+",encoding="utf-8"）  #f是可以循环的for  line  in  f:print(line)　　　　　　#可以把内容一行一行的读出来，可以看到内容的最后一行

with  open("xxx","xx",encoding="utf-8") as f:pass

with open('log1') as obj1, open('log2') as obj2:pass