From f96496f21b732d79e4adc09e52e830a5f80a37c1 Mon Sep 17 00:00:00 2001 From: Dithi Date: Thu, 16 Oct 2025 23:49:23 +0530 Subject: [PATCH 1/3] Feat: Added deque.insert() term entry under Python deque. --- .../concepts/deque/terms/insert/insert.md | 170 ++++++++++++++++++ 1 file changed, 170 insertions(+) create mode 100644 content/python/concepts/deque/terms/insert/insert.md diff --git a/content/python/concepts/deque/terms/insert/insert.md b/content/python/concepts/deque/terms/insert/insert.md new file mode 100644 index 00000000000..0fb8d7d8c6f --- /dev/null +++ b/content/python/concepts/deque/terms/insert/insert.md @@ -0,0 +1,170 @@ +--- +Title: 'deque.insert()' +Description: 'Insertion of an element at a specified position in a deque.' +Subjects: + - 'Computer Science' + - 'Data Science' +Tags: + - 'Deques' + - 'Collections' + - 'Data Structures' + - '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) allows insertion of an element at a specified index within the deque. +Unlike methods such as `append()` or `appendleft()`, which only add elements to the ends, `insert()` enables insertion at _any_ valid position in the deque. + +> 💡 While deques are optimized for fast appends and pops from both ends, using `insert()` in the middle may affect performance since it requires shifting 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) +``` + +Output: + +```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) +``` + +Output: + +```shell +deque(['purple', 'red', 'green', 'blue', 'cyan', 'yellow']) +``` + +- Here, the insert() method demonstrates its flexibility — it can insert items anywhere in the deque. + +## Codebyte Example: How to Use deque.insert() for Dynamic Insertions + +```py +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]) +``` + +Expected Output: + +```shell +Original deque: deque([10, 20, 30, 40]) +Updated deque: deque([5, 10, 20, 25, 30, 40, 50]) +First element: 5 +Middle element: 20 +Last element: 50 +``` + +## Frequently Asked Questions + +
+ +1. Is `deque.insert()` faster than `list.insert()`? + +

+No. Both operations have similar `O(n)` complexity when inserting in the middle, but deques are still more efficient for append and pop operations at either end `(O(1))`. +

+
+ +
+ +2. Can I insert using negative indices in deque? + +

+Yes, you can use negative indices to count positions from the end, just like lists. For example, `d.insert(-1, value)` inserts before the last element. +

+
+ +
+ +3. Does `deque.insert()` return anything? + +

+No. The method modifies the deque in place and returns None. +

+
+ +
+ +4. When should I use `deque.insert()` ? + +

Use `insert()` when you need to add elements in the middle of a deque or at a specific position dynamically. However, for queue-like structures or high-performance operations, prefer `append()` and `appendleft()`. +

+
+ +
+ +5. How does `deque.insert()` differ from `appendleft()` and `append()` ? + +

+`append()` adds to the right end, `appendleft()` adds to the left end, and `insert()` allows insertion at an arbitrary index. +

+
From dd62ab7db6d5e9484c40276ec6741a8358f2fd2c Mon Sep 17 00:00:00 2001 From: Mamta Wardhani Date: Fri, 17 Oct 2025 16:07:07 +0530 Subject: [PATCH 2/3] updated content --- .../concepts/deque/terms/insert/insert.md | 94 ++++--------------- 1 file changed, 17 insertions(+), 77 deletions(-) diff --git a/content/python/concepts/deque/terms/insert/insert.md b/content/python/concepts/deque/terms/insert/insert.md index 0fb8d7d8c6f..6808e75d917 100644 --- a/content/python/concepts/deque/terms/insert/insert.md +++ b/content/python/concepts/deque/terms/insert/insert.md @@ -1,46 +1,41 @@ --- -Title: 'deque.insert()' -Description: 'Insertion of an element at a specified position in a deque.' +Title: 'insert()' +Description: 'Inserts a single element at the specified index in the deque, shifting elements to the right.' Subjects: - 'Computer Science' - 'Data Science' Tags: - - 'Deques' - '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) allows insertion of an element at a specified index within the deque. -Unlike methods such as `append()` or `appendleft()`, which only add elements to the ends, `insert()` enables insertion at _any_ valid position in the deque. +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 from both ends, using `insert()` in the middle may affect performance since it requires shifting elements internally. - ---- +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:** +**Return value:** -None — this method modifies the deque in place. +- `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. +This example demonstrates inserting elements at specific positions within a deque: ```py from collections import deque @@ -54,22 +49,21 @@ fruits.insert(1, "orange") print("After inserting 'orange' at index 1:", fruits) ``` -Output: +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. +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"]) +colors = deque(["red", "green", "blue"]) # Insert at the beginning colors.insert(0, "purple") @@ -83,17 +77,19 @@ colors.insert(-1, "cyan") print(colors) ``` -Output: +The output of this code is: ```shell deque(['purple', 'red', 'green', 'blue', 'cyan', 'yellow']) ``` -- Here, the insert() method demonstrates its flexibility — it can insert items anywhere in the deque. +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 +## Codebyte Example: How to Use `deque.insert()` for Dynamic Insertions -```py +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 @@ -112,59 +108,3 @@ print("First element:", numbers[0]) print("Middle element:", numbers[2]) print("Last element:", numbers[-1]) ``` - -Expected Output: - -```shell -Original deque: deque([10, 20, 30, 40]) -Updated deque: deque([5, 10, 20, 25, 30, 40, 50]) -First element: 5 -Middle element: 20 -Last element: 50 -``` - -## Frequently Asked Questions - -
- -1. Is `deque.insert()` faster than `list.insert()`? - -

-No. Both operations have similar `O(n)` complexity when inserting in the middle, but deques are still more efficient for append and pop operations at either end `(O(1))`. -

-
- -
- -2. Can I insert using negative indices in deque? - -

-Yes, you can use negative indices to count positions from the end, just like lists. For example, `d.insert(-1, value)` inserts before the last element. -

-
- -
- -3. Does `deque.insert()` return anything? - -

-No. The method modifies the deque in place and returns None. -

-
- -
- -4. When should I use `deque.insert()` ? - -

Use `insert()` when you need to add elements in the middle of a deque or at a specific position dynamically. However, for queue-like structures or high-performance operations, prefer `append()` and `appendleft()`. -

-
- -
- -5. How does `deque.insert()` differ from `appendleft()` and `append()` ? - -

-`append()` adds to the right end, `appendleft()` adds to the left end, and `insert()` allows insertion at an arbitrary index. -

-
From 15075ee44b7b7680817b9d019f8c1a6e37cc9ad2 Mon Sep 17 00:00:00 2001 From: Radhika-okhade Date: Wed, 22 Oct 2025 13:31:15 +0530 Subject: [PATCH 3/3] Update content/python/concepts/deque/terms/insert/insert.md --- content/python/concepts/deque/terms/insert/insert.md | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/content/python/concepts/deque/terms/insert/insert.md b/content/python/concepts/deque/terms/insert/insert.md index 6808e75d917..98d3b54193c 100644 --- a/content/python/concepts/deque/terms/insert/insert.md +++ b/content/python/concepts/deque/terms/insert/insert.md @@ -1,6 +1,6 @@ --- Title: 'insert()' -Description: 'Inserts a single element at the specified index in the deque, shifting elements to the right.' +Description: 'Inserts a single element at the specified index in the deque.' Subjects: - 'Computer Science' - 'Data Science'