11-comparison_operators.md

Commands used in the Egghead.io Series Intro to Python

Lesson Eleven - Comparison Operators in Python

Test for equality in Python:

5 == 5 returns True

5 == 4 returns False

Test for inequality in Python:

5 != 4 returns True

Test for greater than in Python:

5 > 3 returns True

Test for less than in Python:

3 < 5 returns True

Test for greater than or equal to in Python:

5 >= 3 returns True

5 >= 5 returns True

Use chaining to test multiple conditions in Python:

3 < x < 5 returns True

Test to see if an object is a given type:

isinstance("will", str) returns True

isinstance("will", int) returns False

Test to see if an object is the exact same with the is operator:

a = True
b = True
a is b # returns True
x = [1, 2, 3]
y = [1, 2, 3]
x is y # returns Flase

Use the in operator to check if a value is present:

x = [1, 2, 3]
3 in x # returns True
5 in x # returns False

Iterate over a list and test for conditional values:

x = [1, 2, 3]
for value in x:
    if value == 2:
        print('Value is 2!')

car = {'model': 'Chevy', 'year': 1970, 'color': 'red'}
if 'model' in car:
    print('This is a {0}'.format(car['model']))