In Python, True and False are used to set a boolean. In this example, the if statement will only be invoked when foo = True.

#!/usr/bin/python
foo = True

if foo == True:
  print("The foo boolean is True")
else:
  print("The foo boolean is not True")

Or like this, using False.

#!/usr/bin/python
foo = False

if foo == False:
  print("The foo boolean is False")
else:
  print("The foo boolean is not False")