#!/usr/bin/env python3

# A Dictionary is a hash table or hash mapping.

# In other languages, they may be referred to as

# Associative Arrays or Associative Memories

# A dict is indexed with keys, which can be any immutable type.

# Dicts are Unordered while returning, but 3.6.1(?) promises

# dicts would be sorted while returning.

# 1. Creating dicts

first_dict = {}

second_dict = dict()

third_dict = {"one": 1, "two": 2, "three": 3}

# Note:

# Printing multiple dicts returns a tuple.

# Printing a single dict returns a dict.

print(first_dict, second_dict, third_dict)

print(third_dict)

# Access values in dicts

# Values are accessed using keys

print(third_dict["one"])

# List all keys in a dict

print(third_dict.keys())