asscii : 8 bits (numeric, English, special characters) represent a character.
A：0000 0001
unicode: (Universal Code) Initial: 16 bits, two bytes, representing two characters.
A：0000 0001 0000 0001
Medium: 0000 0001 0001 0000
Upgrade: 32 bits, 4 bytes represent a character. (a waste of resource)
A：0000 0001 0000 0001 0000 0001 0000 0001
Medium: 0000 0001 0001 0000 0000 0001 0001 0001
utf-8: English: 8 bits, one byte represents one character.
A：0000 0001
Europe: 16 bits, two bytes represent one character.
Chinese: 24 bits, 3 bytes represent one character.
GBK (National Standard) (English and Chinese only)
English: 8 bits, one byte represents one character.
A：0000 0001
Medium: 16 bits, two bytes represent one character.
Medium: 0000 0001 0001 1010
8bit = 1bytes
1024 bytes = 1kb
1024kb = 1MB
1024MB = 1GB
1024GB = 1TB
1024TB = 1PB
== is a comparison value.
is compares memory addresses.
View memory address
a = [1, 2, 3, 4] b = [1, 2, 3, 4] print(id(a)) print(id(b)) print(a is b)
Small data late:
Number: -5~256 The role is to save memory space.
String: 1 Small data pool does not exist if it contains special characters.
2 Elements that are not letters. single letter *int (within 20)
Data Type Supplement
tu1 = ( ' laonanhai ' ) The data in the tuple has only one element and no comma, then what data type is in his parentheses, which is the data type tu2 = ( ' laonanhai ' ,) li= ([1,2,3,4,5]) print(type(li))