Python object, data type summary

Python does not specify data types when defining variables (unlike Java)

Example 1:>>a=10

>>print type (a) # Print types

<type ' int ' > # can automatically recognize data types (for numbers, identify numeric type int)

Example 2:>>b= ' Love '

>>print type (b)

<type ' str ' > # identification data type str

A Python object contains three basic elements: ID (Identity), type (data type), value

Example:>> a=10

>>print ID (a) # Print ID

32145040 # This ID is a random identification of python assigned to a

type- data type:

Number numbers

　　　　number types: int, long, float, complex

String strings

Consists of numbers, letters, underscores

List lists

Example: [' John ', 80,70.2]

Tuple tuples

strings or numbers enclosed in parentheses, read-only, cannot be assigned two times (constants in Java once assigned, cannot be changed while the program is running)

Example: (' Lily ', 2.2,90)

Dictionary Dictionary (Key/value)

Example: {' name ': ' Lucy ', ' Code ': 8080}

Python object, data type summary