#!/usr/bin/python3
# -*- coding: utf-8 -*-
"""
Membership operators work across multiple types of containers
"""
from typing import List

"""
in
Evaluates to True if it finds a variable in the specified sequence
and False otherwise.
"""
x: List[int] = [3, 2, 1]
print(3 in x)
print(5 in x)

mystring: str = "hey there"
print("hey" in mystring)
print("nothere" in mystring)

"""
not in
Evaluates to True if it does not finds a variable in the specified sequence
and False otherwise.
"""
x = [3, 2, 1]
print(3 not in x)
print(5 not in x)

mystring = "hey there"
print("hey" not in mystring)
print("nothere" not in mystring)


# %% Empty containers evaluate to False when tested or cast into bool

# None, 0, and empty strings/lists/dicts/tuples all evaluate to False.
# All other values are True
print(bool(None))  # => False
print(bool(0))  # => False
print(bool(""))  # empty string
print(bool([]))  # empty list
print(bool(()))  # empty tuple
print(bool(set()))  # empty set
print(bool({}))  # empty dict

print("This will be helpful to remember when using if statements and loops!")