gistfile1.py

# normal macro

# \ is ` and $ is ,
macro assert(e):
    \(if DEBUG:
        if not $e:
            raise AssertionError($(stringify(e)))
            
# control structure macro

macro unless(arms):
    assert(len(arms) in {1, 2})
    if len(arms) == 1:
        [cond], body = arms[0]
        return \(if not $cond:
                     $@body)
    else:
        [cond], body = arms[0]
        [], alt = arms[1]
        return \(if not $cond:
                     $@body
                 else:
                     $@alt)
    
control_structure (unless <test>) (else)

x = 1
unless x == 0:
    print('x is not equal to zero')