Here are 3 ways to convert a Set to Dictionary in Python:
- Using dictionary.fromkeys() method
- Using zip() function
- Using Dictionary Comprehension
Method 1: Using dictionary.fromkeys() method
If you want each key in the dictionary to have the same default value, you can use fromkeys() method.
If no default value is provided, it defaults to None.
Visual Representation
Example
# Define a set of integers
sample_set = {1, 3, 5, 7}
print(sample_set)
print(type(sample_set))
# converting set to dictionary
sample_dict = dict.fromkeys(sample_set, 'Ronaldo')
# Print the resulting dictionary and its type
print(sample_dict)
print(type(sample_dict))
Output
{1, 3, 5, 7}
<class 'set'>
{1: 'Ronaldo', 3: 'Ronaldo', 5: 'Ronaldo', 7: 'Ronaldo'}
<class 'dict'>
Remember, sets are unordered collections, so the order of keys in the resulting dictionary can be different from the order of elements in the set.
Method 2: Using zip() function
First, you need to use the zip() function to pair elements from the two sets, which returns an iterable.
Then, convert this iterable to a dictionary using the dict() method.
Visual Representation
Example
# Define a set of integers
sample_set = {1, 3, 5, 7}
# Define another set with string values
set_values = {"Modric", "Messi", "Pepe", "Ronaldo"}
print(sample_set)
print(type(sample_set))
print(set_values)
print(type(set_values))
# Use zip to pair elements from the two sets and create a dictionary
sample_dict = dict(zip(sample_set, set_values))
print(sample_dict)
print(type(sample_dict))
Output
{1, 3, 5, 7}
<class 'set'>
{'Pepe', 'Modric', 'Messi', 'Ronaldo'}
<class 'set'>
{1: 'Pepe', 3: 'Modric', 5: 'Messi', 7: 'Ronaldo'}
<class 'dict'>
Method 3: Using Dictionary Comprehension
Dictionary comprehension is similar to the fromkeys() method.
It iterates over each element in the set and assigns a default value to each key in the dictionary.
Visual Representation
Example
# Define a set of integers
sample_set = {1, 3, 5, 7}
print(sample_set)
print(type(sample_set))
sample_dict = {element: 'Ronaldo' for element in sample_set}
print(sample_dict)
print(type(sample_dict))
Output
{1, 3, 5, 7}
<class 'set'>
{1: 'Ronaldo', 3: 'Ronaldo', 5: 'Ronaldo', 7: 'Ronaldo'}
<class 'dict'>