Python Basics-Dictionaries

#########################################################################
# Dict
# Dict
# dic = {
# "K1": ' V1 ',
# "K2": ' V2 '
# }
# 1 Create a dictionary based on the sequence, and specify a uniform value
# v = Dict.fromkeys (["K1", 123, "999"],123)
# print (v)

# 2 You can specify the default value (None) If the key does not exist.
# v = dic[' k11111 ')
# print (v)
# v = dic.get (' K1 ', 111111)
# print (v)

# 3 Delete and get values
# dic = {
# "K1": ' V1 ',
# "K2": ' V2 '
# }
# v = dic.pop (' K1 ', 90)
# Print (DIC,V)
# k,v = Dic.popitem ()
# Print (DIC,K,V)

# 4 Set the value,
# already exists, does not set, gets the value corresponding to the current key
# does not exist, set, gets the value corresponding to the current key
# dic = {
# "K1": ' V1 ',
# "K2": ' V2 '
# }
# v = dic.setdefault (' k1111 ', ' 123 ')
# Print (DIC,V)

# 5 Update
# dic = {
# "K1": ' V1 ',
# "K2": ' V2 '
# }
# dic.update ({' K1 ': ' 111111 ', ' K3 ': 123})
# Print (DIC)
# dic.update (k1=123,k3=345,k5= "ASDF")
# Print (DIC)

# 6 keys ()

7 VALUES ()

8 items ()

9 Get

10update
##########################################################################

#1, basic institutions
# info = {
# "K1": "V1", # Key-value pairs
# "K2": "V2"
# }

The value of the #2 dictionary can be anything
# info = {
# "K1": 18,
# "K2": True,
# "K3": [
# 11,
# [],
# (),
# 22,
# 33,
# {
# ' KK1 ': ' Vv1 ',
# ' KK2 ': ' Vv2 ',
# ' KK3 ': (11,22),
# }
# ],
# "K4": (11,22,33,44)
# }
# Print (info)

# 3 Boolean (1,0), list, dictionary cannot be a key for a dictionary
# info ={
# 1: ' Asdf ',
# "K1": ' Asdf ',
# True: "123",
# # [11,22]: 123
# (11,22): 123,
# # {' K1 ': ' v1 '}: 123
#
# }
# Print (info)

#4 Dictionary unordered

# info = {
# "K1": 18,
# "K2": True,
# "K3": [
# 11,
# [],
# (),
# 22,
# 33,
# {
# ' KK1 ': ' Vv1 ',
# ' KK2 ': ' Vv2 ',
# ' KK3 ': (11,22),
# }
# ],
# "K4": (11,22,33,44)
# }
# Print (info)

# 5, index method to find the specified element
# info = {
# "K1": 18,
# 2:true,
# "K3": [
# 11,
# [],
# (),
# 22,
# 33,
# {
# ' KK1 ': ' Vv1 ',
# ' KK2 ': ' Vv2 ',
# ' KK3 ': (11,22),
# }
# ],
# "K4": (11,22,33,44)
# }
# # v = info[' K1 ')
# # print (v)
# # v = info[2]
# # print (v)
# v = info[' K3 '][5][' KK3 '][0]
# print (v)

# 6 Dictionary Support del Delete
# info = {
# "K1": 18,
# 2:true,
# "K3": [
# 11,
# [],
# (),
# 22,
# 33,
# {
# ' KK1 ': ' Vv1 ',
# ' KK2 ': ' Vv2 ',
# ' KK3 ': (11,22),
# }
# ],
# "K4": (11,22,33,44)
# }
# del info[' K1 ')
#
# del info[' K3 '][5][' kk1 ']
# Print (info)

# 7 For Loop
# Dict
# info = {
# "K1": 18,
# 2:true,
# "K3": [
# 11,
# [],
# (),
# 22,
# 33,
# {
# ' KK1 ': ' Vv1 ',
# ' KK2 ': ' Vv2 ',
# ' KK3 ': (11,22),
# }
# ],
# "K4": (11,22,33,44)
# }
# for item in info:
# Print (item)
#
# for item in Info.keys ():
# Print (item)

# for item in Info.values ():
# Print (item)

# for item in Info.keys ():
# print (Item,info[item])

# for K,v in Info.items ():
# Print (K,V)

# True 1 False 0
# info ={
# "K1": ' Asdf ',
# True: "123",
# # [11,22]: 123
# (11,22): 123,
# # {' K1 ': ' v1 '}: 123
#
# }
# Print (info)

Python Basics-Dictionaries