Python-bytes-bytearray

Bytes, bytearrybytes (immutable byte sequence) bytearray (variable byte genus) bytes initialization

#空bytesprint(bytes())    #输出：b‘‘#指定字节的bytesprint(bytes(2))   #输出：b‘\x00\x00‘#bytes(iterable_of_ints)->bytesprint(bytes([0,255]))   #输出b‘\x00\xff‘#bytes(string,encoding[,errors])->bytes等价于string.encode()print(bytes(‘abc‘,encoding=‘utf8‘)) #输出b‘abc‘#bytes(bytes_or_buffer)->immutable copy of bytes_or_buffer从一个字节序列或者buffer复制出一个新的不可变bytesa=b‘abcss‘b=bytes(a)print(b)                #输出：b‘abcss‘print(id(a))            #输出：4368131856print(id(b))            #输出：4368131856#说明以上复制并不是重新开辟一块内存空间，而是同时指向这块内存空间#使用b前缀定义print(b‘asd‘)           #输出:b‘asd‘print(b‘\x41\x61‘)      #输出:b‘Aa‘

Bytes operation

#bytes和str类型类似，均为不可变，很多方法一样print(b‘abcsda‘.replace(b‘a‘,b‘z‘))    #输出:b‘zbcsdz‘print(b‘abc‘.find(b‘b‘))               #输出:1#类方法（string必须是2个字符的16进制形式，空格被忽略）print(bytes.fromhex(‘6162 09 6a 6b00‘))     #b‘ab\tjk\x00‘#hex（）,返回16进制表示的字符串print(‘abc‘.encode().hex())             #输出:616263        #索引print(b‘abcdef‘[2])                     #输出:99

ByteArray initialization

#空bytearrayprint(bytearray())              #输出:bytearray(b‘‘)#bytearry(int)指定字节的bytearray，被0填充print(bytearray(5))             #输出:bytearray(b‘\x00\x00\x00\x00\x00‘)#bytearray(iterable_of_ints)->bytearrayprint(bytearray([0,255]))       #输出:bytearray(b‘\x00\xff‘)#bytearray(string,encoding[,errors])->bytearray近似string.encode()print(bytearray(‘abc‘,encoding=‘utf8‘)) #输出bytearray(b‘abc‘)#bytearray(bytes_or_buffer)->immutable copy of bytes_or_buffer从一个字节序列或者buffer复制出一个新的可变的bytearray对象a=b‘abcss‘b=bytearray(a)print(b)                #输出：bytearray(b‘abcss‘)print(id(a))            #输出：4368131856print(id(b))            #输出：4362498768

ByteArray operation

#和bytes类型的方法相同print (ByteArray (b ' ABCSDA '). Replace (b ' A ', B ' Z ')) #输出: ByteArray (b ' Zbcsdz ') print (ByteArray (b ' abc '). Find (b ' B ')) #输出: The # class method (string must be 16 binary form of 2 characters, space is ignored) print (Bytearray.fromhex (' 6162 6a 6b00 ')) #bytearray ( B ' ab\tjk\x00 ') #hex (), returns a 16 binary representation of the string print (ByteArray (' abc '. encode ()). Hex ()) #输出: 616263# index Print (ByteArray (b ' abcdef ') ) [2]) #输出: 99#append (int) trailing an element B=bytearray () b.append (b.append) print (b) #输出: b Ytearray (b ' AC ') #insert (index,int) inserts the element at the specified index B.insert (1,98) print (b) #输出: ByteArray (b ' abc ') #extend (iterabl e_of_ints) appends an iterative set of integers to the current bytearraya=[65,66,67]b.extend (a) print (b) #输出: ByteArray (b ' abcabc ') #pop (index=- 1) Removes the element from the specified index, by default B.pop () print (b) #输出: ByteArray (b ' Abcab ') #remove (value) found the first value removed, no throw exception was found B.remove (66) Print (b) #输出: ByteArray (b ' Abcab ') #reverse () Flip B.reverse () print (b) #输出: ByteArray (b ' ACBA ') #clear () empty bytearrayb.clear () prinT (b) #输出: ByteArray (b ') 

Encoding and decoding

#字符串按照不同的字符编码encode返回字节序列bytesprint(‘abc‘.encode(encoding=‘utf8‘,errors=‘strict‘))   #输出:b‘abc‘#字节序列按照不同的字符集解码decode返回字符串print(b‘abc‘.decode(encoding="utf-8",errors=‘strict‘)) #输出:abcprint(bytearray(b‘abc‘).decode(encoding="utf-8",errors=‘strict‘))  #输出:abc

Python-bytes-bytearray