[Edit] Python: range()

content/python/concepts/built-in-functions/terms/range/range.md

@@ -1,19 +1,20 @@
 ---
 Title: 'range()'
-Description: 'Returns a sequence of numbers based on the given range'
+Description: 'Returns a sequence of numbers based on the given range.'
 Subjects:
-  - 'Data Science'
   - 'Computer Science'
+  - 'Data Science'
 Tags:
   - 'Integers'
-  - 'Range'
   - 'Functions'
+  - 'Range'
+  - 'Values'
 CatalogContent:
   - 'learn-python-3'
   - 'paths/analyze-data-with-python'
 ---
 
-The `range()` function returns a sequence of numbers based on the given range.
+The `range()` [function](https://www.codecademy.com/resources/docs/python/functions) returns a sequence of numbers based on the given range. This function is commonly used for [looping](https://www.codecademy.com/resources/docs/python/loops) a specific number of times in `for` loops. It doesn’t generate all the numbers at once. Instead, it returns a range object that yields numbers individually, making it memory-efficient.
 
 ## Syntax
 
@@ -23,35 +24,70 @@ range(start = 0, stop)
 range(start = 0, stop, step = 1)
 ```
 
-- `stop` (required): specifies where the range will stop, ending at `stop - 1` due to zero-based indexing.
-- `start` (optional): specifies where the range will start, defaulting at 0.
-- `step` (optional): specifies how many steps are taken between indexes, defaulting to 1.
+**Parameters:**
+
+- `stop` (Required): Specifies where the range will stop, ending at `stop - 1` due to zero-based indexing.
+- `start` (Optional): Specifies where the range will start, defaulting to `0`.
+- `step` (Optional): Specifies how many steps are taken between indices, defaulting to `1`.
+
+**Return value:**
+
+The `range()` function returns a range object, yielding numbers one by one.
+
+## Example 1: Using `range()` with `stop`
+
+This example uses the `range()` function with `stop` set to `5`:
+
+```py
+nums = range(5)
+
+print(list(nums))
+```
+
+In the example, `list(num)` converts the returned range object into a [list](https://www.codecademy.com/resources/docs/python/lists).
+
+The output for the example will be:
+
+```shell
+[0, 1, 2, 3, 4]
+```
 
-## Example
+## Example 2: Using `range()` with `start` and `stop`
 
-Here, two variables are created. One with the range set to stop before 5. The other is set to start at 5 and stop before 11. Both are converted to [lists](https://www.codecademy.com/resources/docs/python/lists) before being printed.
+This example uses the `range()` function with `start` set to `6` and `stop` set to `11`:
 
-```python
-x = range(5)
-y = range(5, 11)
+```py
+nums = range(6, 11)
 
-print("x: ", list(x))
-print("y: ", list(y))
+print(list(nums))
 ```
 
-The output from the code above would look like this:
+The output for the example will be:
 
 ```shell
-x: [0,1,2,3,4]
-y: [5,6,7,8,9,10]
+[6, 7, 8, 9, 10]
 ```
 
-## Codebyte Example
+## Codebyte Example: Using `range()` with `start`, `stop`, and `step`
 
-In the example below, the range is set to 10 and increments by 10, stopping before 60:
+This codebyte example uses the `range()` function with `start` set to `10`, `stop` set to `60`, and `step` set to `10`:
 
 ```codebyte/python
-z = range(10, 60, 10)
+nums = range(10, 60, 10)
 
-print("z: ", list(z))
+print(list(nums))
 ```
+
+## Frequently Asked Questions
+
+### 1. What is the difference between range() and list(range())?
+
+The `range()` function returns a range object, yielding numbers one by one. When you wrap it with `list()`, it creates a list containing all the numbers from the range.
+
+### 2. Can `range()` be used with negative numbers?
+
+Yes, you can use `range()` with negative values for `start`, `stop`, or `step`. This is commonly used for counting backwards.
+
+### 3. What happens if the step parameter is `0`?
+
+If you set `step = 0`, Python will raise a [`ValueError`](https://www.codecademy.com/resources/docs/python/errors) because the step must not be zero - this would create an infinite loop.