Variables and Data Types
Digital number: int integer, float float
string String: single and double quotation marks, three marks (multiple lines)
bool Boolean: 1 (True) or 0 (False) can be treated as integer
list file: index starts from 0 [1,2,3, "hi", [4,5,6]] Review: list [0] = 100
tuple Ganso: immutable (1,2,3,4,5)
dict dictionary: random index value + value { "a": 100, "b": 150}
Data type conversion
float（）10→10.0
str () operation can not be performed
int () directly to rounding
BOOL () converts a value Boolean: 0,0.0, None, '', [], {} indicates false
Recognized variable
Variable naming rules
1 to alphanumeric underscores beginning with the letter underlined
2, and does not coincide with the name commonly used functions of
3, no spaces
Assignment of variables
1, the single variable assignment: a = 1
2, multi-variable assignment: a = b = 1 c, d, f = 2,3,4
3, dynamic variables: overwrite the previous assignment later
Operators
Arithmetic operators
Modulo: remainder%
power:**
Divisible: //
Comparison operators (judgment statement)
<= >= == !=
Logical operators (and, or, not)
Member operator (in, not in) lists, dictionaries, tuples, strings
Note
Generally appear in scripted programming, code description, the backup role.
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Note Note
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