Loop Dictionaries
3 min read ·
Looping through dictionaries is a fundamental Python skill, because dictionaries store data as key–value pairs.
Python provides multiple clean and efficient ways to loop through keys, values, or both together.
This topic explains all correct ways to loop through dictionaries, from basics to advanced usage.
Loop Through Dictionary Keys (Default)
By default, looping through a dictionary iterates over keys.
Loop Through Keys Using keys()
Explicitly looping through keys.
Loop Through Dictionary Values
Use
values() to access only values.Loop Through Key–Value Pairs Using items()
The most common and recommended approach.
Loop Using Index (Indirect Way)
Dictionaries do not support direct indexing, but you can convert keys to a list.
Loop Through Nested Dictionaries
Loop with Condition
Loop and Modify Dictionary Values
Use keys while looping to update values.
Loop Using Dictionary Comprehension
Loop Through Dictionary in Sorted Order
Loop Using enumerate() (Advanced)
Common Mistakes
Modifying Dictionary Structure While Looping
Expecting Index-Based Access
Best Practices
- Use
items()for key–value loops - Use
keys()orvalues()when only one is needed - Avoid modifying dictionary size during iteration
- Use comprehensions for transformations
- Sort keys if order matters