Conditional Statements

Conditional Statements use the keywords if, then, and else to perform different logic depending on the statements that are evaluated. Below are a couple examples:

A=5
if A==1:
    print('I see one')
elif A==2:
    print('I see two')
else:
    print("I don't know")

I don't know

if True:
    print('yep')
else:
    print('nope')

yep

You can evaluate objects directly to make conditional decisions based on their contents. Some things typically register as False, for example, such as empty objects.

if False:
    print('yep')
else:
    print('nope')

nope

if []:
    print('yep')
else:
    print('nope')

nope

if None:
    print('yep')
else:
    print('nope')

nope

if ():
    print('yep')
else:
    print('nope')

nope

if {}:
    print('yep')
else:
    print('nope')

nope

While non-empty objects usually register as True.

if [1,2,3]:
    print('yep')
else:
    print('nope')

yep

if [None,None,None]:
    print('yep')
else:
    print('nope')

yep

And so forth…