python dictionary of dictionaries

Python basic training Question 2-tuples, dictionaries, and python Basic Training 1. determine the value in the tuples >>> a = ( 1, 2, 3, 4, 10 )>>> 10 in aTrue>>> '10' in a False 2. Modify the values in the tuples. Because the tuples cannot be directly modified, You can first convert them into a list. After the list is modified, assign them to a new tuple object.

, Radiansdict.copy (): Returns a shallow copy of a dictionary3. Radiansdict.fromkeys (): Create a new dictionary with the key of the dictionary in sequence seq, Val is the initial value corresponding to all keys of the dictionary4, Radiansdict.get (Key, Default=none): Returns the value of the specified key. Assumed value does not return the default value in the dictionary5, Radiansdict.has_key (key): Assumi

corresponding to the key name (list also has the pop method n = [' ['] ', ' ""] n.pop (0) is the subscript, the return is the value, the subscript is not passed Default last one)Info.pop (' 333 ', ' ha ') can return a pre-set value if no corresponding key is found5. Member relationship operations in, Has_key () the latter is a dictionary-specific methodInfo.has_key (' AA ') returns TRUE or Falsekeys () Returns a list of all the keys in the dictiona

code is as follows:Car_value = All.get ('Car')#The return value is a dictionary that executes the result: {' name ': ' Beijing ', ' Color ': [' red ', ' yellow ', ' black '], ' money ': 1111}Print(car_value) color_list= Car_value.get ('Color')#The returned result is list, based on key to find the corresponding value, execution result: [' red ', ' yellow ', ' black ']Print(color_list) Color_list_value= Color_list[1]#list based on the subscript value,

)) Popend.timeit ( number=1000)0.0003161430358886719The above code can be seen as pop(0) true pop()效率低 , but no validation pop(0) time complexity is o(n) but pop() o( C16>1). To verify this we need to look at an example and call a list at the same time. Look at the following code:Popzero = Timer ("x.pop (0)", "From __main__ import x") Popend= Timer ("X.pop ()", "From __main__ import x")Print("Pop (0) pop ()") forIinchRange (1000000,100000001,1000000): x=List (ra

1. Merging of dictionaries#The first Python built-in method, Dict and * * Unpacking the way>>> A = {'name': 1,'b': 2}>>> B = {'name': 1,'C': 10}>>> C = Dict (A, * *b)>>>c{'name': 1,'b': 2,'C': 10}#the second update () method with the dictionary#Can be weighted with the elements in B to update the elements of a, the elements of a will change, but the memory addres

A summary of the similarities and differences between sequences and dictionaries in Python. Commonalities:1. They are all core types of python and are part of the python language itself. Core Type and non-core typeMost core types can generate their objects through specific syntax. For example, "dave" is the expression

Several methods for creating dictionaries in Python (recommended) and several python Methods 1. Traditional text expressions: >>> d={'name':'Allen','age':21,'gender':'male'}>>> d{'age': 21, 'name': 'Allen', 'gender': 'male'} This method is very convenient if you can spell out the entire dictionary in advance. 2. dynami

A python dictionary is another mutable container model, and can store any type of object, such as strings, numbers, tuples, and other container models.First, create a dictionaryA dictionary consists of a pair of keys and corresponding values. Dictionaries are also referred to as associative arrays or hash tables. The b

dictionary:1 info = {' name ': ' Dean ', 2 ' job ': ' IT ', 3 ' age ': 23,4 ' company ': ' XDHT ' 5 }6 print (info)The results of the operation are as follows:D:\python35\python.exe D:/python Training/s14/day2/dcit-2.py{' Company ': ' xdht ', ' name ': ' Dean ', ' Age ': ' ' job ': ' IT '}It can be seen from here that the dictionary