If it rains, I stay at home, else I go swimming: alternative execution

An alternative block of code is defined, syntax:

if CONDITION:
  STATEMENT1
  ...
  STATEMENTn
else:
  ALTSTAT1
  ..
  ALTSTATm

with:

CONDITION, a boolean expression

ALTSTAT1..ALTSTATm, statements which are executed if the CONDITION is FALSE