Create list_comprehension.md

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Added Syntax
Added Examples
Added Conclusion

contrib/advanced-python/list_comprehension.md

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+# List Comprehension
+
+Creating lists concisely and expressively is what list comprehension in Python does. You can generate lists from already existing iterables like lists, tuples or strings with a short form. 
+This boosts the readability of code and reduces necessity of using explicit looping constructs.
+
+## Syntax :
+
+### Basic syntax
+
+```python
+new_list = [expression for item in iterable]
+```
+- **new_list**: This is the name given to the list that will be created using the list comprehension.
+- **expression**: This is the expression that defines how each element of the new list will be generated or transformed.
+- **item**: This variable represents each individual element from the iterable. It takes on the value of each element in the iterable during each iteration.
+- **iterable**: This is the sequence-like object over which the iteration will take place. It provides the elements that will be processed by the expression.
+
+This list comprehension syntax `[expression for item in iterable]` allows you to generate a new list by applying a specific expression to each element in an iterable.
+
+### Syntax including condition
+
+```python
+new_list = [expression for item in iterable if condition]
+```
+- **new_list**: This is the name given to the list that will be created using the list comprehension.
+- **expression**: This is the expression that defines how each element of the new list will be generated or transformed.
+- **item**: This variable represents each individual element from the iterable. It takes on the value of each element in the iterable during each iteration.
+- **iterable**: This is the sequence-like object over which the iteration will take place. It provides the elements that will be processed by the expression.
+- **if condition**: This is an optional part of the syntax. It allows for conditional filtering of elements from the iterable. Only items that satisfy the condition
+ will be included in the new list.
+
+
+## Examples:
+
+1. Generating a list of squares of numbers from 1 to 5:
+   
+```python
+squares = [x ** 2 for x in range(1, 6)]
+print(squares)
+```
+
+- **Output** :
+```python
+[1, 4, 9, 16, 25]
+```
+
+2. Filtering even numbers from a list:
+   
+```python
+nums = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
+even = [x for x in nums if x % 2 == 0]
+print(even)
+```
+
+- **Output** :
+```python
+[2, 4, 6, 8, 10]
+```
+
+3. Flattening a list of lists:
+```python
+matrix = [[1, 2, 3], [4, 5, 6], [7, 8, 9]]
+flat = [x for sublist in matrix for x in sublist]
+print(flat)
+```
+
+- **Output** :
+```python
+[1, 2, 3, 4, 5, 6, 7, 8, 9]
+```
+
+List comprehension is a powerful feature in Python for creating lists based on existing iterables with a concise syntax. 
+By mastering list comprehension, developers can write cleaner, more expressive code and leverage Python's functional programming capabilities effectively.