Feat: Added deque.insert() term entry under Python deque.

content/python/concepts/deque/terms/insert/insert.md

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+---
+Title: 'insert()'
+Description: 'Inserts a single element at the specified index in the deque.'
+Subjects:
+  - 'Computer Science'
+  - 'Data Science'
+Tags:
+  - 'Collections'
+  - 'Data Structures'
+  - 'Deques'
+  - 'Methods'
+CatalogContent:
+  - 'learn-python-3'
+  - 'paths/computer-science'
+---
+
+The **`insert()`** method of Python’s [`collections.deque`](https://www.codecademy.com/resources/docs/python/collections-module) inserts an element at a specified index within the deque. Unlike `append()` or `appendleft()`, which add elements only to the ends, `insert()` can add an element at any valid position.
+
+While deques are optimized for fast appends and pops at both ends, using `insert()` in the middle may affect performance because it shifts elements internally.
+
+## Syntax
+
+```pseudo
+deque.insert(index, element)
+```
+
+**Parameters:**
+
+- `index` : The position where the new element will be inserted.
+- `element` : The item to insert into the deque.
+
+**Return value:**
+
+- `None`: This method modifies the deque in place.
+
+## Example 1: Inserting an Element at a Specific Position
+
+This example demonstrates inserting elements at specific positions within a deque:
+
+```py
+from collections import deque
+
+# Create a deque
+fruits = deque(["apple", "banana", "cherry"])
+print("Original deque:", fruits)
+
+# Insert 'orange' at index 1
+fruits.insert(1, "orange")
+print("After inserting 'orange' at index 1:", fruits)
+```
+
+The output of this code is:
+
+```shell
+Original deque: deque(['apple', 'banana', 'cherry'])
+After inserting 'orange' at index 1: deque(['apple', 'orange', 'banana', 'cherry'])
+```
+
+## Example 2: Using Negative Indices and Edge Insertions
+
+This example demonstrates inserting elements at the beginning and end using positive and negative indices:
+
+```py
+from collections import deque
+
+colors = deque(["red", "green", "blue"])
+
+# Insert at the beginning
+colors.insert(0, "purple")
+
+# Insert at the end using len(colors)
+colors.insert(len(colors), "yellow")
+
+# Insert before the last item using negative index
+colors.insert(-1, "cyan")
+
+print(colors)
+```
+
+The output of this code is:
+
+```shell
+deque(['purple', 'red', 'green', 'blue', 'cyan', 'yellow'])
+```
+
+Here, the `insert()` method demonstrates its flexibility that it can insert items anywhere in the deque.
+
+## Codebyte Example: How to Use `deque.insert()` for Dynamic Insertions
+
+In this example, `insert()` adds elements at various positions in a deque, demonstrating dynamic insertions at the beginning, middle, and end:
+
+```codebyte/python
+from collections import deque
+
+# Create a deque of numbers
+numbers = deque([10, 20, 30, 40])
+print("Original deque:", numbers)
+
+# Insert elements at various positions
+numbers.insert(2, 25)       # Insert at index 2
+numbers.insert(0, 5)        # Insert at beginning
+numbers.insert(len(numbers), 50)  # Insert at end
+
+print("Updated deque:", numbers)
+
+# Access elements to verify insertion
+print("First element:", numbers[0])
+print("Middle element:", numbers[2])
+print("Last element:", numbers[-1])
+```