03_python data types

python data types

The data type 1.python

(1) data type classification

python data types can be divided 数字型and 非数字型.

• Numeric
  • Integer ( int)
  • Float float( )
  • Boolean bool( )
  • Complex type ( complex) (mainly used for scientific computing)
• Non-digital type
  • String
  • List
  • Tuple
  • dictionary

Note: In Python 2.x, the integer value stored depending on the length of the further divided into: int(integer) long(long)

(2) variable between different types of operational problems:

• 数字型变量Can be calculated directly between
• 字符串变量Use between +string concatenation
• 字符串变量And you can 整数use the *repetition of the same splicing字符串

• 数字型变量And 字符串between not be another computing

  The definition and use of variables in 2.python

• Defined: python is interpreted programming language, it does not specify a data type definition of variables. Interpreter type automatic recognition data according to the value to the right of the assignment operator.

• Use: In Python, each variable must be assigned before use, variable assignment after the variable will be created

Note: Use the interactive differ on the form and interpretation of the definition and use of variables.

3.python variable named

• case-sensitive identifier python
• python named variables can be used:
  • Underline law
  • Small hump law
  • Large hump law