#
#	Python dict basic
#
person_1 = {
    "name": "Jane", 
    "dob": "12/08/1997", 
    "city": "Houston"
}

print(f"person_1: {person_1}")

print(f"id(person_1): {id(person_1)}") 
person_1['school'] = 'uhcl'
print(f"person_1 after 'person_1['school'] = 'uhcl'': {person_1}")
print("dicts are mutable.")
print(f"id(person_1): {id(person_1)}") 

print("""
#   keys are unique.
person_2 = {
    "name": "Jane", 
    "name": "Johnson",
    "dob": "12/08/1997", 
    "city": "Houston"
}
""")
#   keys are unique.
person_2 = {
    "name": "Jane", 
    "name": "Johnson",
    "dob": "12/08/1997", 
    "city": "Houston"
}
print(f"person_2: {person_2}")

def hello():
    print("hello")
def bye():
    print("bye")   

print("""
#  keys can be any mutable.
dict_1 = {
    hello: 1,
    bye: 2,
    "hello": 3,
    4: 4
}
""")
#  keys can be any immutable.
dict_1 = {
    hello: 1,
    bye: 2,
    "hello": 3,
    4: 4
}
print(f"dict_1: {dict_1}")
print(f"dict_1[hello]: {dict_1[hello]}")
print(f"dict_1['hello']: {dict_1['hello']}")
print(f"dict_1[4]: {dict_1[4]}")

#   Keys cannot be mutable.
print("""
#   Keys cannot be mutable.
list_1 = [1,2,3]
dict_2 = {
    "hey": 1,
    list_1: 2
}
Traceback (most recent call last):
  File "...", line 63, in <module>
    dict_2 = {
TypeError: unhashable type: 'list'
""")

print("""
#   values can be mutable.
list_1 = [1,2,3]
dict_2 = {
    "hey": 1,
    "ho": list_1
}
""")

#   values can be mutable.
list_1 = [1,2,3]
dict_2 = {
    "hey": 1,
    "ho": list_1
}
print(f"list_1: {list_1}")
print(f"dict_2: {dict_2}")

#  
list_1.append(4) 
print("After 'list.append(4)':")
print(f"   list_1: {list_1}")
print(f"   dict_2: {dict_2}")

dict_2['ho'].append(7)
print("After 'dict_2['ho'].append(7):")
print(f"   list_1: {list_1}")
print(f"   dict_2: {dict_2}")