Dictionary Traversal: Methods to Iterate Over Keys, Values, and Key-Value Pairs in Python Dictionaries

There are three common methods to iterate over Python dictionaries for efficient key-value pair data processing: 1. **Iterating over keys**: Use `for key in dict` by default, which directly retrieves keys. This is suitable for scenarios where only keys are needed (e.g., counting the number of keys). 2. **Iterating over values**: Obtain the value view object via `dict.values()` and iterate over this view to avoid accidentally accessing keys when values alone are required. 3. **Iterating over key-value pairs**: Use `dict.items()`, which returns tuples of key-value pairs, enabling simultaneous access to both keys and values (e.g., generating reports). Key considerations: Python 3.7+ dictionaries maintain insertion order; avoid modifying the dictionary during iteration; use `_` as a placeholder for unwanted elements (e.g., `for _, value in items()`). In summary, select the appropriate method based on requirements: use `for key in dict` for keys, `values()` for values, and `items()` for key-value pairs to flexibly handle dictionary data.