python software, also known as the python interpreter.
1. path: #! / usr / bin / env python
2. coding: # _ * _ Coding: utf8 _ * _
Note: The coding is not used in the python3; Chinese python2 appear in the document, the head must be added coding.
3. Variables
. A letters, numbers and underscores;
. B can not start with a number;
. c Do not use keywords as variables :
'and'，'as'，'assert'，'break'，'class'，'continue'，'def'，'del'，'elif'，'else'，'except'，'exec'，'finally'，'for'，'from'，
'global'，'if'，'import'，'in'，'is'，'yield'，'lambda'，'not'，'or'，'pass'，'print'，'raise'，'return'，'try'，'while'，'with'；
. D Do not repeat the python built things: such sum.
4.input: always wait until the user enters a value, the value assigned to the variable input
Do: alert the user to enter: User name and password
. 1 N1 = INPUT ( ' Enter Username: ' ) 2 N2 = INPUT ( ' Enter password: ' ) . 3 Print (N1) . 4 Print (N2)
5.pass usage
If a is equal to 1, no operation is performed; otherwise, the output hello
. 1 IF . 1. 1 == : 2 Pass . 3 the else : . 4 Print ( " Hello " )
6. The basic data types
String: quotes
Adder: the equivalent of a few words is combined;
Multiplication: n1 = "alex"
n2 = n1 * 10
Showing results: alex repeated 10 times
Digital: Math /
** 2 4: 2 to the fourth power
39% 8:39 divided by modulo 8 = 7
39 // 8: quotient = 4