Python: if statement

if

if 'one' < 'two':
    print('one < two')

if … else

if 'one' < 'two':
   print('one < two')
else:
   print('one >= two')

else if

a = 1
b = 1

if   a < b:
     print('a < b' )

elif a > b:
     print('a > b' )

else:
     print('a == b')

Ternary operator

val = 42
result = 'yes' if val == 42 else 'no'
print(result)

val = 99
result = 'yes' if val == 42 else 'no'
print(result)

Assignment in if statement

def half(n):

    r = n/2
    return r if int(r) == r else None


def F(n):

    if h := half(n):
       print('half({}) = {}'.format(n,h))
    else:
       print('{} is odd'.format(n))


F(42)
F(99)

Using if in list comprehensions

result = [ expr(x) for x in someList if criterion(x)]

See also