price in products: unique_price_set.add(price) return len(unique_price_set) products = [ (143121312, 100), (432314553, 30), (32421912367, 150), (937153201, 30) ] print('number of unique price is: {}'.format(find_unique_price_using_set(products))) # 输出 number of unique ...
First, you’ll learn how to use property() as a function through practical examples. These examples will demonstrate how to validate input data, compute attribute values dynamically, log your code, and more. Then you’ll explore the @property decorator, the most common syntax for working with...
# Function to add a method to a class dynamicallydefadd_method(cls,method_name,method):# Use setattr to add the method to the classsetattr(cls,method_name,method)# Define an empty classclassMyClass:pass# Define a method to be added to the classdefgreet(self):return"Hello, dynamically ad...
Let us see how we can add more methods and attributes to this newly created child class. Add the__init__()Function to the Child Class After Extending a Class We can add a newinit()function to the child class even when inheriting a class. Note that whenever an object of a class is...
Let’s see how we can use the random choice function to carry out perhaps the simplest random process – the flip of a single coin. 让我们看看如何使用随机选择函数来执行可能是最简单的随机过程——抛一枚硬币。 I’m first going to import the random library. 我首先要导入随机库。 So I type ...
First add a @cache decorator to your module: Python decorators.py import functools # ... def cache(func): """Keep a cache of previous function calls""" @functools.wraps(func) def wrapper_cache(*args, **kwargs): cache_key = args + tuple(kwargs.items()) if cache_key not in ...
Function to Add Two Numbers This function takes two numbers as input, adds them, and returns the result. Example: Python 1 2 3 4 5 6 7 8 # Function to add two numbers def add_numbers(a, b): return a + b print(add_numbers(5, 3)) Output: Explanation: Here, add_numbers() ...
The dynamically-generated delete() and save() methods on Django model objects get alters_data=True automatically. Example: def sensitive_function(self): self.database_record.delete() sensitive_function.alters_data = True Occasionally you may want to turn off this feature for other reasons, and...
Define Class Method Example 1: Create Class Method Using @classmethod Decorator Example 2: Create Class Method Using classmethod() function Example 3: Access Class Variables in Class Methods Class Method in Inheritance Dynamically Add Class Method to a Class ...
Assigning functions to variables To kick us off we create a function that will add one to a number whenever it is called. We'll then assign the function to a variable and use this variable to call the function. def plus_one(number): return number + 1 add_one = plus_one add_one(5...