1.What was the python function previewed in discussion that is commonly used with simple lambda functions and lists?

2.

Write a function that takes a list of strings, and insert spaces to every string in the list according to the following rules:

• If the string is empty, change the empty string to one space

• Else if the string length is less than or equal to 4, insert a space every character

• Else if the string length is less than or equal to 8, insert a space every two characters

• Else insert a space every three characters

Return the new list of strings after inserting spaces.

Notes:

1. Don't insert a space at the end, except when the string is empty.

2. You may find the built-in function str.join() helpful.

Requirements: assert statements, one-line list comprehension.