List Comprehensions in Python
List comprehensions allow you to generate lists by applying a given expression to each element of the future list. Comprehensions can also be used to filter elements according to specified conditions.
The comprehension specifies the expression
that will be applied to the elements of
the original list. The for...in construct
specifies the element name and the source
list (iterable object) from which the new one will be
created:
pythonlist = [expression for element in iter]
Let's declare a variable lst. For
it, we specify that the list element i
should be generated in the range from 1
to 10. Then we output the resulting
list to the console:
pythonlst = [i for i in range(1, 10)]
print(lst)
After executing the code, a new list will be returned:
python[1, 2, 3, 4, 5, 6, 7, 8, 9]
Using a comprehension, create the following list:
python[1, 2, 3, 4, 5]
Using a comprehension, create the following list:
python[5, 4, 3, 2, 1]