Variables and operators are the foundation of learning of each programming language.
Python talk following common variables and operators
I. Variables
1. Definition of variables: the use of symbols to represent a changing value.
2.Java, c, c ++, c # language data types and the like are strongly, when the definition must determine what type of data storage down, such as: int a = 10; however python language data types is weak, so do not define stressed data types, such as 10 = a;
3. when defining Boolean variables must be capitalized first letter, such as: C = True; False C =
4.Python variable types are not fixed, such as: the beginning of the definition of a = 10, later on, define a = 10.05, is possible (i.e., what variables to values received, then the type of the object becomes type)
naming rules 5. variables:
composition ① variable name must be a valid symbol (uppercase and lowercase letters, numbers, underscores), python is case-sensitive language
② Do not use the keyword or reserved word as a variable name (keyword: more than 20 reserved words: the current version is not used, but later versions may be used)
③ Do not digital beginning
④ names to be meaningful: hump law: userName classRoom
underlined law: user_name class_room (python use)
two common operator.
common operator: has a special meaning, can be Data (value) symbols transport
① arithmetic operators: the mathematical symbol for transportation +, - , /, //,%
(+ has two effects: 1 2. The string concatenation data are added.)
(The modulo remainder of the process, since weak python data type, the result may be a decimal, to display an integer (floor division), or the two %% @)
, such as:
a power of (* *): 
② relationship (Comparative) operators:>, <,> =, <=, ==,! = (The only one)
(result: Boolean value (True, False))
such as:
③ logical operators: and and, or or, non-Not
(the result is Boolean)
as:
④ assignment operator: = , + =, - =, =, / =, = //, ** =,% = (Python is not added from decrementing)
as:
⑤ Bitwise
