Python Dynamic Class Creation: Flexible Method Inclusion
Creating Classes with Methods from a Template:
Write a Python function “create_class_with_methods” that takes a class name, a dictionary of attributes, and a dictionary of methods, and returns a dynamically created class with those attributes and methods.
Sample Solution:
Python Code :
# Function to create a class dynamically with specified attributes and methods
def create_class_with_methods(name, attrs, methods):
# Combine attributes and methods into a single dictionary
attrs.update(methods)
# Create a new class with the given name, inheriting from 'object', and using the combined dictionary
return type(name, (object,), attrs)
# Define attributes for the dynamic class
attributes = {
# Add an attribute 'species' with value 'Human'
'species': 'Human',
# Add an attribute 'age' with value 25
'age': 25
}
# Define methods for the dynamic class
methods = {
# Add a method 'greet' that returns a greeting string using the class attributes
'greet': lambda self: f"Hello, I am a {self.species} and I am {self.age} years old."
}
# Create a class dynamically using the defined attributes and methods
DynamicClass = create_class_with_methods('DynamicClass', attributes, methods)
# Test the dynamic class
# Create an instance of the dynamically created class
instance = DynamicClass()
# Call the 'greet' method of the instance
print(instance.greet()) # Output: "Hello, I am a Human and I am 25 years old."
Output:
Hello, I am a Human and I am 25 years old.
Explanation:
- Function Definition:
- "create_class_with_methods" takes 'name' (the name of the class), 'attrs' (a dictionary of attributes), and 'methods' (a dictionary of methods).
- Combine Attributes and Methods:
- 'attrs.update(methods)' combines the attributes and methods into a single dictionary.
- Create Class:
- The 'type' function is used to create a new class with the given 'name', inheriting from 'object', and using the combined dictionary of attributes and methods.
- Attributes Definition:
- attributes is a dictionary containing:
- species: An attribute with the value 'Human'.
- age: An attribute with the value 25.
- Methods Definition:
- methods is a dictionary containing:
- greet: A method that returns a greeting string using the 'species' and 'age' attributes.
- Create Dynamic Class:
- DynamicClass is created dynamically by calling "create_class_with_methods" with the class name, attributes, and methods.
- Testing:
- An instance of 'DynamicClass' is created.
- The "greet" method of the instance is called, returning "Hello, I am a Human and I am 25 years old."
Python Code Editor :
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