Python Tutorials - List Comprehension
Info:
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Code - List Comprehension:
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#!/usr/bin/python
Constructing a list of numbers from 1 - 10
numberList = []
for i in range(1, 11):
numberList.append(i)
print ("List of numbers: ")
print (numberList)
numberListComprehension = [i for i in range(1,11)]
print (numberListComprehension)
Constructing a list of even numbers from 2 - 10
evenNumbersList = []
for i in range(1, 11):
if i % 2 == 0:
evenNumbersList.append(i)
print ("Even numbers through regular method: ")
print (evenNumbersList)
evenNumbersListComprehension = [i for i in range(1,11) if i%2 == 0]
print (evenNumbersListComprehension)
Constructing a list of odd numbers from 1 - 9
oddNumbersList = []
for i in range(1,11):
if i % 2 != 0:
oddNumbersList.append(i)
print ("Odd numbers through regular method: ")
print (oddNumbersList)
oddNumbersListComprehension = [i for i in range(1,11) if i%2 != 0]
print (oddNumbersListComprehension)
Constructing a list of tuples
classInfoList = []
studentNames = ['John', 'Mary', 'Nathan', 'Adam', 'Bob']
studentAges = [10, 9, 10, 11, 8]
for i in range(0, 5):
studentInfo = (studentNames[i], studentAges[i])
classInfoList.append(studentInfo)
print ("List of tuples: ")
print (classInfoList)
classInfoListComprehension = [(studentNames[i], studentAges[i]) for i in range(0,5)]
print (classInfoListComprehension)
Slide - List Comprehension:
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Concise way to create lists
Returns a list and can be:
List of singleton elements
List of tuples
List of dictionaries and so on
Syntax:
Square brackets
One or more FOR clause
One or more expressions to evaluate
Variables to be added to the list
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