List comprehensions are a powerful tool for creating and manipulating lists. They consist of an expression that is followed by a for clause and then followed by zero, or more, if clauses. The syntax for list comprehensions is simply the following:

[expression for item in list]

Then, perform the following:

#list comprehensions using strings
>>> list_comprehension_1 = [ x for x in 'python parallel programming cookbook!' ]
>>> print( list_comprehension_1)

['p', 'y', 't', 'h', 'o', 'n', ' ', 'p', 'a', 'r', 'a', 'l', 'l', 'e', 'l', ' ', 'p', 'r', 'o', 'g', 'r', 'a', 'm', 'm', 'i', 'n', 'g', ' ', 'c', 'o', 'o', 'k', 'b', 'o', 'o', 'k', '!']

#list comprehensions using numbers
>>> l1 = [1,2,3,4,5,6,7,8,9,10]
>>> list_comprehension_2 = [ x*10 for x in l1 ]
>>> print( list_comprehension_2)

[10, 20, 30, 40, 50, 60, 70, 80, 90, 100]