Python/Notes/Python_Special.py at master · HopeMashal/Python · GitHub

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
""" _______________________________ """
#!""" Python Special/Dunder Methods """

from ast import For


print("--------")
print(1+1) #* The output is 2
print("--------")
print("Hope"+" Mashal") #* The output is Hope Mashal
print("--------")
print(3*3) #* The output is 9
print("--------")
print("Hope"*3) #* The output is HopeHopeHope
print("--------")

""" _______________________________ """

a="Hope Mashal"
b=['Hope','Amal']

print(len(a)) #* The output is 11
print(b[1]) #* The output is Amal
print(a.__len__()) #* The output is 11
print(b.__getitem__(1)) #* The output is Amal

print(dir(a)) #* The output is --> All the dunder methods I can use it with variable a
""" The dunder/Magic methods:
['__add__', '__class__', '__contains__', '__delattr__', '__dir__', '__doc__', '__eq__', '__format__', '__ge__', '__getattribute__', '__getitem__', '__getnewargs__', '__gt__', '__hash__', '__init__', '__init_subclass__', '__iter__', '__le__', '__len__', '__lt__', '__mod__', '__mul__', '__ne__', '__new__', '__reduce__', '__reduce_ex__', '__repr__', '__rmod__', '__rmul__', '__setattr__', '__sizeof__', '__str__', '__subclasshook__', 'capitalize', 'casefold', 'center', 'count', 'encode', 'endswith', 'expandtabs', 'find', 'format', 'format_map', 'index', 'isalnum', 'isalpha', 'isascii', 'isdecimal', 'isdigit', 'isidentifier', 'islower', 'isnumeric', 'isprintable', 'isspace', 'istitle', 'isupper', 'join', 'ljust', 'lower', 'lstrip', 'maketrans', 'partition', 'removeprefix', 'removesuffix', 'replace', 'rfind', 'rindex', 'rjust', 'rpartition', 'rsplit', 'rstrip', 'split', 'splitlines', 'startswith', 'strip', 'swapcase', 'title', 'translate', 'upper', 'zfill']
"""

""" _______________________________ """

class Order:
  def __init__(self, cart, customer):
    self.__cart = cart
    self.__customer = customer

  def __len__(self):
    return len(self.__cart)

  def __call__(self):
    print(f"{self.__customer}")

  def __str__(self):
    return f"{self.__customer} bought {self.__cart}"

  def __repr__(self):
    return f"Order(list of items, customer name)"

  def __bool__(self):
    return len(self.__cart)>0

  def orderMsg(self):
    if self.__cart:
      print(f"{self.__customer} order is processing!!")
    else:
      print(f"Shopping cart is empty!!!")

  def __add__(self,other):
    new_cart = self.__cart.copy()
    new_cart.append(other)
    return Order(new_cart, self.__customer)

  def __iadd__(self,other):
    self.__cart.append(other)
    return self

  def __radd__(self,other):
    new_cart = self.__cart.copy()
    new_cart.insert(0,other)
    return Order(new_cart, self.__customer)

  def __getitem__(self,key):
    return self.__cart[key]

order = Order(["laptop","monitor"], "Hope Mashal")
print(len(order)) #* The output is 2
order() #* The output is Hope Mashal
print(order) #* The output is Hope Mashal bought ['laptop', 'monitor'] --> If we don't have __str__ method, the output will be Order(list of items, customer name)
print(repr(order)) #* The output is Order(list of items, customer name)
print(bool(order)) #* The output is True --> (len(order.cart)2>0)
order.orderMsg() #* The output is Hope Mashal order is processing!!

order_1=Order([],"Yuki")
order_1.orderMsg() #* The output is Shopping cart is empty!!!

order_1 + "Mouse"+"USB stick"
print(order_1) #* The output is Yuki bought [] --> Because the cart didn't change, you need to save the change in order_1

order_1=order_1 + "Mouse"+"USB stick"
print(order_1) #* The output is Yuki bought ['Mouse', 'USB stick']

order_1 += "Keyboard"
print(order_1) #* The output is Yuki bought ['Mouse', 'USB stick', 'Keyboard']

order_1 = "Monitor" + order_1
print(order_1) #* The output is Yuki bought ['Monitor', 'Mouse', 'USB stick', 'Keyboard']

if order_1: #? It's like order_1.orderMsg()
  print(f"Your order is processing!!")
else:
  print(f"Shopping cart is empty!!!")

""" _______________________________ """

"""

  For Addition :
    __add__(self) => m = m + n
    __radd__(self) => m = n + m
    __iadd__(self) => m += n

  For Multiplication :
    __mul__(self) => m = m * n
    __imul__(self) => m *= n

  For Division :
    __div__(self) => m = m / n
    __idiv__(self) => m /= n

  For Subtraction :
    __sub__(self) => m = m - n
    __isub__(self) => m -= n

"""

print(order_1[0]) #* The output is Monitor
print(order_1[2]) #* The output is USB stick

""" _______________________________ """