class methods in python
from datetime import date
# random Person
class Person:
def __init__(self, name, age):
self.name = name
self.age = age
@classmethod
def fromBirthYear(cls, name, birthYear):
return cls(name, date.today().year - birthYear)
def display(self):
print(self.name + "'s age is: " + str(self.age))
person = Person('Adam', 19)
person.display()
person1 = Person.fromBirthYear('John', 1985)
person1.display()python: @classmethod
class Float:
def __init__(self, amount):
self.amount = amount
def __repr__(self):
return f'<Float {self.amount:.3f}>'
@classmethod
def from_sum(cls, value_1, value_2):
return cls(value_1 + value_2)
class Dollar(Float):
def __init__(self, amount):
super().__init__(amount)
self.symbol = '€'
def __repr__(self):
return f'<Euro {self.symbol}{self.amount:.2f}>'
print(Dollar.from_sum(1.34653, 2.49573))python classmethod
# classmethod example
In [20]: class MyClass:
...: @classmethod
...: def set_att(cls, value):
...: cls.att = value
...:
In [21]: MyClass.set_att(1)
In [22]: MyClass.att
Out[22]: 1
In [23]: obj = MyClass()
In [24]: obj.att
Out[24]: 1
In [25]: obj.set_att(3)
In [26]: obj.att
Out[26]: 3
In [27]: MyClass.att
Out[27]: 3python class with function @classmethod
import numpy as np
class Unknown:
def __init__(self, p1, p2, p3, p4):
self.p1 = p1
self.p2 = p2
self.p3 = p3
self.p4 = p4
def random_func(self, p5):
'''Function that return an array from a range,
with specified shape, and name'''
step1 = np.array(np.arange(self.p1)).reshape((self.p2,self.p3))
step2 = self.p4
print(step2)
print('Printing p5 =>', p5)
return step1
@classmethod
def a_class_method(self, p6):
print(f'This is a class method: {p6}')
#PREPARE PARAMS
# cust_arr = random_func(self.p1, self.p2, self.p3, self.p4)
params = {'p1':12, 'p2':3, 'p3':4, 'p4':'Creating customized array with params'}
#INSTANCIATE
here = Unknown(**params)#16, 4, 4, 'This actually work too!')
here.random_func('This is P5')
Unknown.a_class_method('P6 value is now used !')Copyright © 2021 Codeinu
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