Python `wat`s

wat.py

#########

# What happens when you run this?

print(1 + 0001)

# Does this code run? If not- why? If so- what is the value of `result`?

class Foo:
    foo = 0

myFoo = Foo()

result = [myFoo for myFoo.foo in [1,2,3]]

# What about this?
class Foo:
    foo = 0

myFoo = Foo()

result = [myFoo for (myFoo.foo if True else myFoo.foo) in [1,2,3]]

########

def f(x):
    return f(x[0])

# What does f(1) do?
# What does f([1,2,3]) do?
# What does f("abc") do?

########

# 1. What does this code do?

def b():
    a = 2
    del a
    return a
print(b())


# 2. What does this code do?

def b():
    def c():
        nonlocal a
        a = 3
    c()
    return a
print(b())

# 3. Now, what does this code do?

def b():
    a = 2
    del a
    def c():
        nonlocal a
        a = 3
    c()
    return a
print(b())


########

# FLEXIBILE(TM)
# DYNAMIC(TM)
# AGILE(TM)
def log_this_class(cls):
    def also_kill_kitten(f):
        def inner(*args, **kwargs):
            print("killed a kitten")
            return f(*args, **kwargs)
        return inner


    setattr(cls, "__getattribute__", also_kill_kitten(cls.__getattribute__))
    return cls

@log_this_class
class Foo:
    foo = 2

print(Foo().foo)

########

def test():
    return lambda a=(yield 2): a

x = test()
print(x(1))

########

x = 1
for x  in [2]:
  pass
print(x)

How about

l = map(lambda c: c, ['a'])
print('a' in l)
print('a' in l)

What does this print?

wat!