Python List and Dict methods

# # #list类的方法


# # # #append Last add an element in the list
A = [1,2,3,4,5,6, "DSSDSD"]
A.append (5)
Print (a)

# # #clear Empty the elements in the list
Example:
A = [1,2,3,4,5,6, "DSSDSD"]
A.clear ()
Print (a)

# # #copy Copy List
Example:
A = [1,2,3,4,5,6, "DSSDSD"]
V1 = a.copy ()
Print (v1)

# # Number of specified elements in #count list
Example:
A = [1,2,3,4,5,6, "DSSDSD", 2]
V1 = A.count (2)
Print (v1)

# # #extend Add elements to the list last
Example:
A = [1,2,3,4,5,6, "DSSDSD", 2]
V1 = A.extend ("4")
Print (a)

# # #index The index position of the elements within the list
Example:
A = [1,2,3,4,5,6, "DSSDSD", 2]
V1 = A.index (3)
Print (v1)

# # #index Insert index insert element into table
Example:
A = [1,2,3,4,5,6, "DSSDSD", 2]
A.insert (2, "index")
Print (a)

# # #pop Remove elements from a specified list using an index
Example:
A = [1,2,3,4,5,6, "DSSDSD", 2]
A.pop (0)
Print (a)

# # #remove Delete the specified element in the list
Example:
A = [1,2,3,4,5,6, "DSSDSD", 2]
A.remove (1)
Print (a)

# # #reverse Reverse List
Example:
A = [1,2,3,4,5,6, "DSSDSD", 2]
A.reverse ()
Print (a)

# # #sort list from small to large sort note You can only do small to large sorting of numeric lists.
Example:
A = [13,12,23,43,55,6,4545,2]
A.sort ()
Print (a)


######### #dict字典方法

# # #fromkeys to create a dictionary from a sequence and specify a uniform value
Example:
v = Dict.fromkeys (["ASD", 234,3333,2323],555)
Print (v)

# # #get Print out the value of key in the dictionary
Example:
info = {"K1": 3, "K2": 4, "K3": 5, "K4": 6, "K5": 7}
v = info.get ("K1") # # #get ("ASD", 1111) when a key ASD does not exist in the dictionary, the output of the following 1111
Print (v)

# # #pop Delete a key-value pair in the dictionary
Example:
info = {"K1": 3, "K2": 4, "K3": 5, "K4": 6, "K5": 7}
v = info.pop ("K1")
Print (INFO,V)

# # # #popitem Randomly delete a key-value pair in a dictionary
Example:
info = {"K1": 3, "K2": 4, "K3": 5, "K4": 6, "K5": 7}
v = Info.popitem ()
Print (INFO,V)

# # #setdefault Set a value that, when it exists in the dictionary, gets the value of the set key that is added to the dictionary when the setting value does not exist
Example:
info = {"K1": 3, "K2": 4, "K3": 5, "K4": 6, "K5": 7}
v = Info.popitem ()
Print (INFO,V)

# # #update Update the values in the dictionary and add to the dictionary when the key-value pair does not exist
Example:
info = {"K1": 3, "K2": 4, "K3": 5, "K4": 6, "K5": 7}
v = info.update ({"K1": +, "K7": 4000})
Print (info)

# # #keys Get the value of all keys in the dictionary
Example:
info = {"K1": 3, "K2": 4, "K3": 5, "K4": 6, "K5": 7}
v = Info.keys ()
Print (v)

# # #values Get the values of all values in the dictionary
Example:
info = {"K1": 3, "K2": 4, "K3": 5, "K4": 6, "K5": 7}
v = info.values ()
Print (v)

Python List and Dict methods