A program transforms stored pairs into named configuration entries.
What You Need to Understand
dict() creates a dictionary from keyword arguments, a mapping, or an iterable of two-item pairs. Calling it without arguments creates an empty dictionary.
When to Use It
A program transforms stored pairs into named configuration entries.
Step-by-Step Python Example
pairs = [("theme", "dark"), ("size", 12)]
settings = dict(pairs)
options = dict(enabled=True, retries=3)
print(settings)
print(options)How the Example Works
Each pair supplies one key and value. Keyword arguments become string keys matching the parameter names.
Example Output
{'theme': 'dark', 'size': 12}
{'enabled': True, 'retries': 3}
{1: 'one', 2: 'two'}A Second Example
Compare this smaller variation with the main example, then experiment with your own values.
pairs = [(1, "one"), (2, "two")]
print(dict(pairs))Important Behavior and Edge Cases
Keyword argument syntax can only represent valid identifier-shaped string keys. To construct other key types, use pairs or a literal.
Try It Yourself
Build a dictionary from a list of two-element tuples with numeric keys.
Common Beginner Mistakes
- Keyword argument syntax can only represent valid identifier-shaped string keys. To construct other key types, use pairs or a literal.
- Treating missing dictionary keys, replacement precedence, and shallow copies as if they had identical behavior in every context.
Key Takeaways
dict()creates a dictionary from keyword arguments, a mapping, or an iterable of two-item pairs.- Each pair supplies one key and value.
- Keyword argument syntax can only represent valid identifier-shaped string keys.