assert isinstance(dir(), list)

assert "__builtins__" in dir()

class A:

def test():

pass

a = A()

assert "test" in dir(a), "test not in a"

assert "test" in dir(A), "test not in A"

a.x = 3

assert "x" in dir(a), "x not in a"

class B(A):

def __dir__(self):

return ("q", "h")

# Gets sorted and turned into a list

assert ["h", "q"] == dir(B())

# This calls type.__dir__ so isn't changed (but inheritance works)!

assert "test" in dir(A)

# eval() takes any mapping-like type, so dir() must support them

# TODO: eval() should take any mapping as locals, not just dict-derived types

class A(dict):

def __getitem__(self, x):

return dir

def keys(self):

yield 6

yield 5

assert eval("dir()", {}, A()) == [5, 6]

import socket

assert "AF_INET" in dir(socket)