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Encoding and decoding

Encoding and decoding

Encode (Encoding)-get the byte corresponding to the plaintext encoding (binary)

Decode (Decoding)-decodes the encoded byte (binary) into the corresponding plaintext

#-*-encoding:utf-8-*-indicates that utf-8 coding is used when Chinese is available.

ASCII code does not support Chinese

Support for English, numbers and symbols

8 bits and 1 byte

Gbk International supports Chinese, English, numbers and symbols, and must be compatible with ASCII codes.

English 16 bits and 2 bytes

16 bits and 2 bytes in Chinese

Unicode universal code must be compatible with ASCII code

Support for Chinese and English, numbers and symbols

32 bits and 4 bytes in English

32 bits and 4 bytes in Chinese

The universal code with variable utf-8 length uses at least 8 bits.

English 8 bits 1 byte

European 16 bits 2 bytes

24 bits and 3 bytes in Chinese

ASCII code for python2 version

When the python3 program runs, it uses unicode to display everything.

Bytes type: bytes type is used for both transport and storage

Utf-8 encoding is used by default when pycharm storage

S = 'are you hungry'

S1 = s.encode ('gbk') # code, Gbk code, one Chinese character 2 two bytes

Print (S1) # b'\ xb6\ xf6\ xc1\ xcb\ xc2\ xf0',\ xb6 counts as one byte

S2 = s1.decode ('gbk') # Decoding

Print (S2)

Print (s.encode ('utf-8'))

A = 'boss'

Print (a.encode ('utf-8')) # b'\ xe5\ xa4\ xa7\ xe4\ xbd\ xac', two Chinese characters, six bytes, gbk decoding, two bytes one Chinese character, then gbk decoding should be three Chinese characters

Print (a.encode ('utf-8'). Decode (' gbk')) # Pulp, utf-8 coding, gbk decoding

# be careful to decode whatever code is used

B = 'China'

Print (b.encode ('gbk')) # Encoding-b'\ xd6\ xd0\ xb9\ xfa'

Print (b.encode ('gbk'). Decode (' gbk')) # encode and then decode-China

A = 'modesty'

B = 'modesty'

Print (id (a), id (b))

Ls = [1, 3, 4, 4, ""]

Ls2 = [1, 3, 4, 4, ""]

Print (id (ls), id (ls2)) # list memory address is different

Print (not ls is ls2) # True

Print (id (ls [- 1]), id (ls2 [- 1]) # extract elements, but the memory address of the same element is the same 47059648 47059648

Ls = [1, 3, 4, 4, ""]

Ls2 = [1, 3, 4, 4, 'Hapi']

Print (id (ls [- 1]), id (ls2 [- 1])) # 47059648 47061664

# the string above occupies a certain position in memory. For the second time, you only need to call the string under the memory address and no longer create it. Provincial memory

# when a string contains special characters, the memory address is different

A = [1pm 2pm 3]

B = a

C = b

Print (a = = c) # compare values, because the list is created only once, remember the question: has a new cache been created, the answer is no

Print (an is c) # compares the memory address. All three variables point to a list, so the memory address is the same.

# when comparing memory addresses, you need to see how many lists have been created. In this way, create a list once, with the same memory address, and create multiple lists with different addresses, but the string is not applicable.

A = [1, 3, 4]

B = [1pr 3pr 4]

C = b

Print (a = = c) # True

Print (an is b) # fasle

Print (an is c) # false

S = 'Hello'

Print (s.encode ('gbk')) # b'\ xc4\ xe3\ xba\ xc3\ xc2\ xf0'

C = b'\ xc4\ xe3\ xba\ xc3\ xc2\ xf0'

Print (c.decode ('gbk')) # Decoding

Print (s.encode ('utf-8')) # b'\ xe4\ xbd\ xa0\ xe5\ xa5\ xbd\ xe5\ x90\ x97'

Print (s.encode ('utf-8'). Decode (' gbk')) # raccoon decoder, decode whatever you use, this decoding is meaningless, that is all the content of this article "what is python encoding and decoding?" Thank you for reading! I believe you will gain a lot after reading this article. The editor will update different knowledge for you every day. If you want to learn more knowledge, please pay attention to the industry information channel.

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