Attr function Python

Attr function Python

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The attr() function is a built-in function in Python that allows you to dynamically access and manipulate the attributes of an object (such as a class or instance). This function is commonly used for dynamic attribute access and modification.

Here's a simple example:

Let's define a class called Person with two attributes: name and age:

class Person:
def init(self, name, age):
self.name = name
self.age = age
p = Person('John', 30)
print(p.name)  # Output: John
print(p.age)   # Output: 30

Now, let's use the attr() function to dynamically access and modify these attributes:

import attr
class Person:
def init(self, name, age):
self.name = name
self.age = age
p = Person('John', 30)
Dynamically access the name attribute using attr()
print(attr.getattr(p, 'name'))  # Output: John
Dynamically modify the age attribute using attr()
attr.setattr(p, 'age', 31)
print(p.age)   # Output: 31

In this example, we import the attr() function from the attr module and then use it to dynamically access and modify the attributes of the Person class.

The attr() function can be used with various types of objects, including classes, instances, modules, and dictionaries. It's a powerful tool for working with Python's object-oriented features.

Some other common uses of the attr() function include:

Overall, the attr() function is a useful tool for working with Python's dynamic nature and can help you write more flexible and efficient code.

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Python function attributes list

I'd be happy to provide you with a comprehensive list of Python function attributes.

Function Attributes

In Python, functions are first-class citizens, meaning they can be passed as arguments to other functions, returned from functions, and stored in data structures. When you define a function, you can add attributes to it using the @ symbol followed by the attribute name. Here's a list of some common function attributes:

Example: def my_function(): pass; print(my_function.__name__) # Output: my_function

Example: def my_function(x): pass; print(my_function.__doc__) # Output: None (since no docstring was provided)

Example: import math; def my_function(): pass; print(my_function.__module__) # Output: __main__ (if run in interactive shell), math (if run within a Python file)

Example: def my_function(x=1): pass; print(my_function.__defaults__) # Output: (1,)

Example: def my_function(x: int) -> None: pass; print(my_function.__annotations__) # Output: {'x': <class 'int'>, 'return': None}

These are some common attributes you can add to your Python functions. Keep in mind that not all of these attributes apply to every function, and some may be specific to certain use cases or libraries.