input Dictionary in python-CodePudding

Im new to python i have problems with understanding Dictionaries in python especially how to get them as input from user Can smn explain it to me as an example on 1 task

1 line is number of records then Actor name and movies they played seperated by comma

output must be movie name:actor name,actor name

I dont undrestand what is key and what is value How should i convert this input lines as dictionary ?

CodePudding user response：


d = {}  # initialize empty dictionary
n = int(input()). # get number of input lines
for _ in range(n):
    actor, *films = input().split(", ")  # get actor and films
    for film in films:  # add actor to each film in dictionary
        d[film] = d.get(film, [])   [actor]

for film, actors in d.items():  # iterate the dictionary
    print(f"{film}: {', '.join(actors)}")  # print the data using join function to add "," character between films

If you need to sort keys and values of them add this code:

for key, value in sorted(d.items(), key=lambda x: x[0]):
    d[key] = sorted(value)

CodePudding user response：

initially, you just create an empty dictionary in python. Then input a number to loop a number of times you want to take input. Then put a for loop and input key and value and store them in the dictionary as dict[key]=value.

Here is the code sample in python

dict={} 
n=int(input())
for i in range(n):
    key=input()
    value=intput()
    dict[key]=value