*Last updated: 2023-03-16.*
# tf_quant_finance.utils.iterate_nested
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Creates an iterator over every leaf value in depth first order.
```python
tf_quant_finance.utils.iterate_nested(
nd, previous_keys=None
)
```
Iterates over a nested dictionary in depth first order. The order in which
the peer keys are traversed is not guaranteed (same as for the keys of a
dictionary).
```Example
nested_dict = {'a': 1, 'b': [2, 3, 4], 'c': {'d': 8}}
for k, v in iterate_nested(nested_dict):
print('_'.join(k), v)
# Prints out:
# a: 1
# b: [2, 3, 4]
# c_d: 8
```
#### Args:
* `nd`: The dictionary to be traversed.
* `previous_keys`: If supplied, the computed key list will be a join of the
previous_keys and the current keys.
#### Yields:
A tuple of the key path and the value for each leaf node.