#!/usr/bin/python3
# -*- coding: utf-8 -*-
"""
Namespaces implementation
"""

# Global namespace implementation
print(__builtins__["globals"]())
print(globals())
print(type(globals()))
print(dir(globals()))
x = "thing"
print(globals())
print(x)
print(globals()["x"])
print(x is globals()["x"])
globals()["y"] = 100
print(y)


# Local namespace
def f(x: float, y: float) -> None:
    s = "foo"
    print(locals())


f(10.0, 0.5)


"""
globals() returns an actual reference to the dictionary that contains the
global namespace. That means if you call globals(), save the return value, and
subsequently define additional variables, then those new variables will show up
in the dictionary that the saved return value points to:
"""
g = globals()
print(g)
x = "foo"
y = 29
print(g is globals())


def f2() -> None:
    """
    locals() behaves in the same way:
    """
    s = "foo"
    loc = locals()
    print(loc)
    x = 20
    print(loc)
    loc["s"] = "bar"
    print(s)
    print(loc is locals())


f2()