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Use itertools.zip_longest in Python to combine iterables of different lengths, filling in missing values with a specified fill value.

## How to use python itertools.zip_longest

The `itertools.zip_longest` function in Python is used to iterate over multiple iterable objects, filling in missing values with a specified fill value. This function is useful when you need to combine iterables of different lengths and want to ensure that all iterables are exhausted before the iteration stops.

### Syntax
“`python
itertools.zip_longest(*iterables, fillvalue=None)
“`

### Parameters
– `*iterables`: This is the iterable objects to zip together.
– `fillvalue`: This is the value used to fill in the missing values. If not specified, `None` is used as a default fill value.

### Example
“`python
import itertools

# Zip together two iterables of different lengths
a = [‘A’, ‘B’, ‘C’, ‘D’]
b = [‘x’, ‘y’]
result = itertools.zip_longest(a, b, fillvalue=’-‘)

for item in result:
print(item)
“`

### Output
“`
(‘A’, ‘x’)
(‘B’, ‘y’)
(‘C’, ‘-‘)
(‘D’, ‘-‘)
“`

In the example above, the `zip_longest` function combines the iterables `a` and `b` into tuples, filling in missing values with `’-‘`. This ensures that all elements from both `a` and `b` are included in the zipped result.

Overall, `itertools.zip_longest` is a powerful tool in Python for handling multiple iterables of varying lengths and ensuring that all elements are included in the zipped result. It provides flexibility in dealing with data structures that may not align perfectly in terms of length.