Sometimes, we want to append multiple values for one key in a dictionary with Python.
In this article, we’ll look at how to append multiple values for one key in a dictionary with Python.
How to append multiple values for one key in a dictionary with Python?
To append multiple values for one key in a dictionary with Python, we can set the value for a key to a list and the append to the list.
For instance, we write
years_dict = dict()
for line in list:
if line[0] in years_dict:
years_dict[line[0]].append(line[1])
else:
years_dict[line[0]] = [line[1]]
to loop through the list list with a for loop.
In it, we check if line[0] is a key in the years_dict dict.
If it is, then we call append to append line[1] into the list.
Otherwise, we assign a list with line[1] in it as the value of the entry with key line[0].
Conclusion
To append multiple values for one key in a dictionary with Python, we can set the value for a key to a list and the append to the list.
