Python- dictionary Dict

Dictionary (Dictionary)

　　Key must be immutable, it may be numbers, strings or tuples to act as, a list of not

Dictionary traversal

　　1, traverse Key

. 1 dict1 = { " red ball " : 5, " basketball " : 3, " yellow ball " :. 4 }
 2  for I in dict1:
 3      Print (I)　　
　　# output as 
red ball 
basketball 
yellow ball

　　　

　　　　　( - if the same number of bits per Key, Key can each character separately.)

. 1 dict1 = { " red ball " : 5, " basketball " : 3, " yellow ball " :. 4 }
 2  for I, B in dict1:
 3      Print (I ":", B) 
　　# output is as follows: 
red: Ball 
Basket: ball 
yellow: ball

　　

　　2, traversing values

. 1 dict1 = { " red ball " : 5, " basketball " : 3, " yellow ball " :. 4 }
 2  for I in dict1.values ():
 3      Print (I) 
　　# output is as follows: 
5 
3 
. 4

　　

　　3, traverse the dictionary entry. [Get] tuple type

 

. 1 dict1 = { " red ball " : 5, " basketball " : 3, " yellow ball " :. 4 }
 2  for I in dict1.items ():
 3      Print (I)
 . 4  Print (type (I)) 
　　output is as follows: 
( 'red ball', 5) 
( 'basketball', 3) 
( 'yellow ball',. 4) 
<class 'tuple'>

 

　　　

　　　　　( - Traverse key dictionary entry.)

= {Dict1. 1 " red ball " : 5, " basketball " : 3, " yellow ball " :. 4 }
 2 for I, B in dict1.items ():
 3      Print (I, B)
 . 4 Print (type (I) ) 
　　# output is as follows: 
red ball 5 
basketball 3 
yellow ball. 4 
<class 'STR'>