python learning (data type)

Basic data types

(1) numbers digital

• % D int int

 

• Long integer Long

• Boolean boor
  • 　　True False

• % F float type
  • 　　3.1415926 4.2E-10

• Complex complex
  • 　　6.23 + 1.5j -1.23-987j

(2)% s string str

name1 = 'zhengying'
print type(name1)

(3) the tuple (tuple)

• definition:
  • 　　Variable is connected behind the ()
  • 　　Brackets empty, then an empty tuple
  • 　　When there is only one element in brackets, is not tuple string str
  • 　　To achieve only one element tuple in parentheses, you need to add a comma behind the element ""
• Features:
  • 　　Tuples can not modify / delete / insert elements Operation

 

(4) List (list)

• definition:
  • 　　Variable is connected behind the []
  • 　　Whether in [] is empty or only a single / multiple values, are a listing
• Features:
  • 　　Support for the list to modify / delete / insert elements operating

(5) Dictionary (dict)

• definition:
  • 　　Variable is connected behind {}
  • 　　When the {} is null, null Dictionary
  • 　　The key-value dictionary of the format, such as brackets { "key1": "value1", "key2": "value2"}
• Features:
  • 　　Support for the dictionary to modify / delete / insert elements operating

(6) a collection (set)

• definition:
  • 　　Contact is {} after the variable, but not key parentheses to the format, but the string