update: lambda expression example for python sort (#26044)

Added example that use lambda expression as key during sorting list.

guide/english/python/lists/list-sort-method/index.md

@@ -71,6 +71,17 @@ b.sort(key = compareByAge)
 #Output
 print b # prints [('Adam', 20), ('Rahul', 25), ('Rahman', 30)]
 ```
+You can also use <b>Lambda expression</b> instead of full function to define key. <br>Here is example of sorting strings based on last two characters:
+```py
+# Our strings can contain any characters and we want to sort them based on last two of them
+strings = ["apple_05", "orange_01", "strawberry_03", "pear_04", "banana_02"]
+
+# Take just last two characters as key value
+strings.sort(key = lambda x: x[-2:])
+
+# Output
+print strings    # Prints ['orange_01', 'banana_02', 'strawberry_03', 'pear_04', 'apple_05']
+```
 
 ### Sorting Basics