Lists, dictionaries, append

List[]

The definition list can be empty or you can directly define the elements in the list, for example: list = ["Hello", "World", "DLRB"]

dict{}

The definition dictionary can be empty or you can directly define multiple keys, items in the dictionary, for example:

Dict = {

"A": 5

"B": []

"C": ["Hello", "World", "DLRB"]

}

The key in the dictionary is unique

Append used to write data into a list or dictionary

1A = [11,22,33,44,55,66,77,88,99,90]2b ={3 "Key1" : [],4 "Key2" : []5 }6  forIinchA:7     ifI > 66:8b["Key1"].append (i)9     elifI < 66:Tenb["Key2"].append (i) One print (b)

We give a list a, we want to write all the numbers greater than 66 and less than 66 to Key1 and Key2 in dictionary b, and output the dictionary

Output Result:

{'key2'key1': [77, 88, 99, 90]}

Lists, dictionaries, append