Detailed explanation of python string, bytes, bytearray types

Python3 makes a distinction between text and binary data. The text is Unicode encoded, str type, used for display. The binary type is bytes type, used for storage and transmission. bytes is a sequence of bytes, and str is a sequence of unicode. This article mainly introduces the python string type bytes type bytearray type. Friends who need it can refer to it. I hope it can help everyone.

1. str type:

 >>> s = u'你好'
 >>> s
 '你好'
 >>> type(s)
 <class></class>

bytes type:

 >>> b = b'abc'
 >>> b
 b'abc'
 >>> type(b)
 <class></class>

2. The conversion relationship between str and bytes: str-->encode()-->bytes-->decode()-->str

Conversion method one: encode( ), decode()

 >>> a = u'你好'
 >>> b = a.encode('utf-8')
 >>> b
 b'\xe4\xbd\xa0\xe5\xa5\xbd'
 >>> type(b)
 <class>
 >>> new_a = b.decode('utf-8')
 >>> new_a
 '你好'
 >>> type(new_a)
 <class></class></class>

Conversion method two: bytes(), str()

 >>> a = u'你好'
 >>> b= bytes(a, encoding='utf-8')
 >>> b 
 b'\xe4\xbd\xa0\xe5\xa5\xbd'
 >>> type(b)
 <class>
 >>> new_a = str(b, encoding='utf-8')
 >>> new_a
 '你好'
 >>> type(new_a)
 <class></class></class>

3. Bytearray type

The bytearray class is a variable sequence in the range 0

The optional source parameter can be used to initialize the array in several different ways:

• If it is a string, then you must also give the encoding (and optionally an error) Parameters; bytearray() then uses str.encode() to convert the string to bytes.
• If it is an integer, then the array will have this size and will be initialized with null bytes.
• If it is an object conforming to the buffer interface, the byte array will be initialized using the object's read-only buffer.
•If it is an iterable, then it must be an iteration of integers in the range 0

When the source parameter is a string:

 >>> b = bytearray(u'你好', encoding='utf-8')
 >>> b
 bytearray(b'\xe4\xbd\xa0\xe5\xa5\xbd')
 >>> type(b)
 <class></class>

When the source parameter is an integer:

 >>> b = bytearray(5)
 >>> b
 bytearray(b'\x00\x00\x00\x00\x00')
 >>> type(b)
 <class></class>

When the source parameter is an iterable object, then the elements of this iterable object must conform to 0

 >>> b = bytearray([1, 2, 3, 4, 255])
 >>> b
 bytearray(b'\x01\x02\x03\x04\xff')
 >>> type(b)
 <class><p></p>4. The difference between bytes and bytearray<p></p>bytes is immutable, the same as str. bytearray is variable, the same as list. <p></p>
<p></p>
<pre class="brush:php;toolbar:false">
 >>> b = bytearray()
 >>> b
 bytearray(b'')
 >>> b.append(10)
 >>> b
 bytearray(b'\n')
 >>> b.append(100)
 >>> b
 bytearray(b'\nd')
 >>> b.remove(100)
 >>> b
 bytearray(b'\n')
 >>> b.insert(0, 150)
 >>> b
 bytearray(b'\x96\n')
 >>> b.extend([1, 3, 5])
 >>> b
 bytearray(b'\x96\n\x01\x03\x05')
 >>> b.pop(2)
 1
 >>> b
 bytearray(b'\x96\n\x03\x05')
 >>> b.reverse()
 >>> b
 bytearray(b'\x05\x03\n\x96')
 >>> b.clear()
 >>> b
 bytearray(b'')

5. Conversion of bytes and bytearray

 >>> b = b'abcdef'
 >>> bay = bytearray(b)
 >>> bay
 bytearray(b'abcdef')
 >>> b = bytes(bay)
 >>> b
 b'abcdef'

6. Conversion of bytearray and str

 >>> a = 'abcdef'
 >>> b = bytearray(a, encoding='utf-8')
 >>> b
 bytearray(b'abcdef')
 >>> a = b.decode(encoding='utf-8')
 >>> a
 'abcdef'

Related recommendations:

A brief discussion on several sorting methods of numpy arrays_python

Describe the maximum continuous subsequence in Python language and

Completely master Python

The above is the detailed content of Detailed explanation of python string, bytes, bytearray types. For more information, please follow other related articles on the PHP Chinese website!