Day1 Python Primer

1. The first sentence of the Python statement

Print "Hello,world"

Execute file: Python hello.py

2. Variables

Note: variable names can only be any combination of letters, numbers, or underscores when defining variables, the first character of a variable name cannot be a number, and the Python keyword cannot be a variable.

2.1 Assignment of variables:

name1 = "Oldboy"

Print variable values

Print (NAME1)

3.python Interactive Input input

Name = input ("Please input name":)

Pring (name)

4. Number Types

I NT (integral type):

string:

In the definition of the value of the variable is quoted is a string, when the definition of the variable has multiple rows of values then we use the multi-quotes three quotation mark "" "to define

Boolean type:

Two values, a true (true), a false (false), mainly in mind to determine the logic

>>> a=3

>>> b=4

>>> a > 3

False

>>> a < 4

True

>>>

list type:

Definition, list nesting, Value column table values to use curly braces []

Test = [1,2,[4,5]]

Print (test[2][1])

List variable Increase append

Test.append ([5,6])

Dictionary type:

Only basic definition, value dictionary to use curly braces {}

dic={' name ': 2, ' name2 ': ' 3 '}

Print (dic[' name '])

dic[' name ']= ' body '

Print (DIC)

Day1 Python Primer