Python Bytes: List Comprehensions Introduction
Python Bytes
Intermediate Python Topics
List Comprehensions Introduction
#A method of making lists from other values.
#Defining a list and its contents at the same time.
new_list = [ item for item in iterable ]
#An 'iterable' is an object that contains other objects within it.
#Lists, Dictionaries, Tuples, Sets, range(), and more.
#You can work backwards from a loop to create the comprehension and understand the logic.
#This is a good technique when you are still new to list comprehensions.
#Example 1:
new_list = list()
for num in range(0,10):
new_list.append(num)
new_list = [num for num in range(0,10)]
#Example 2:
fqdns = ['abc.dev.com', 'dew.qka.com', 'kwlan.ewa.com']
hostnames = list()
for fqdn in fqdns:
hostnames.append(fqdn.split('.')[0])
hostnames2 = [ fqdn.split('.')[0] for fqdn in fqdns ]
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