Python Convert a list of tuples to dictionary.
Description:
We will use setdefault() method and dict() method to solve this problem,Firstly let's know what is setdefault() methods and what does it do .
setdefault() methods returns the value of the key(if the key is in dictionary).If not, it inserts the key with a value to dictionary.
Syntax :
dict.setdefault(key[,default_value])
key - key to be searched in the dictionary
default_value (optional) - key with a value default_value is inserted to the dictionary if key is not in the dictionary.
If not provided, the default_value will be None.dict() method creates a dictionary.
Syntax- dict(keyword arguments )
Example: dict(name="Khushi",age=19,country="India")
Now we will use these two methods to solve the problem.
1st method by using setdefault():
So the idea to use setdefault is to convert the first parameter to key and second to the value of the dictionary and will add into the dictionary if key is not there.
Program:
#define a list of tuples to convert into a dictionary
tup=(['harry',20],['johny',35],['peter',20],['khushi',19])
#define an empty dictionary
dic={}
#iterate the tuple element and append into dictionary using setdefault() method
for a,b in tup:
dic.setdefault(a,[]).append(b)
print("Dictionary is :",dic)
Output:
Dictionary is : {'harry': [20], 'johny': [35], 'peter': [20], 'khushi': [19]}
2nd method using dict()
Its very simple to convert list of tuples into dictionary using dict() method.
Program:
#define a list of tuples to convert into a dictionary
tup=(['harry',20],['johny',35],['peter',20],['khushi',19])
#pass the tuple as parameter to dict() method to create a dictionary
dic=dict(tup)
print("Dictionary is :",dic)
Output:
Dictionary is : {'harry': [20], 'johny': [35], 'peter': [20], 'khushi': [19]}
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