Priority: Arithmetic operators have the highest priority, followed by bitwise operators, member test operators, relational operators, logical operators, etc. To avoid precedence errors, it's best to use parentheses explicitly.

Relationship: == equal to,! = is not equal to, (=)>, (=)<,

Arithmetic: , - ,*multiplication,/division,//finding the quotient, % finding the remainder, **power operation

Logic: and, or, not The operation result is a Boolean value: True, False

Assignment: =, ( , -, /, etc.) =

Membership test: (not) in determines whether it is (not) an element of the sequence. The operation result is a Boolean value: True, False

Object identity, bit: not examined

Number: Integer: Integer without decimal point. |Floating point type: composed of integers and decimals|Complex number type: real numbers and imaginary numbers (floating point type)|Boolean type: True (1), False (0)\/Function: int () converted to integer | float () floating point number |complex(x,y) complex number, real number x, imaginary number y.

String: " "Python's characters default to Unicode encoding. Function: ord() converts characters to Unicode codes | chr() converts Unicode to characters

List, tuple, dictionary, set

1When calling a function, a pair of parentheses "()" must be added after the function name 2 Functions usually have a return value, indicating the result of the call; 3 Different functions have different numbers of parameters, some are required and some are optional; 4. The parameter values ​​of the function must comply with the required data types; 5 Functions can be called nested, that is, one function can be used as a parameter of another function.

input

print

Format string %, format (alignment specifier and symbol specifier)

import import

if elif else

while, for

range(a, b, step) from a to b (excluding b), the step size is step

break,continue,else

Indexable and slicing accessible

1.1 List[]: list

1.2 tuple(): tuple

1.3 String (English name str): str

2.1 Dictionary {}: dict, the keys are immutable and unique

2.2 Set {}: set

Positional parameters

Default value parameters

keyword arguments

Variable length parameters: *arg, **kwargs

Opening and closing files: open, close, with statements

Reading and writing files