To obtain the class name of an instance, you can employ the __class__.__name__ method in Python.
Obtaining the class name of an instance is a valuable task in Python for purposes such as debugging, logging, and primarily for dynamic coding. This aids in determining the kind of object to be utilized. In this article, we will delve into various methods to retrieve the class name of an instance in Python.
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Output:
Explanation: The __class__ attribute provides a reference to the object’s class, while the __name__ attribute retrieves and returns the class name as Intellipaat.
Technique 2: Utilizing type() and __name__ in Python
The function type(object) yields the class of the object, which points to the class in the attribute, and the __name__ provides you with the class name as a string.
Example:
Python
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Output:
Clarification: The @property decorator transforms the cls method into a property that yields the class name of the object. When you access a.cls, it outputs the class name as ‘Intellipaat_Guide’.
Method 4: Employing Nested Classes to ascertain the class name in Python.
The Nested classes method to retrieve the class name in Python. The Nested class approach utilizes __qualname__ to provide the complete path to the class. It furnishes a more comprehensive reference compared to __name__.
Illustration:
Python
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// Function to copy code to the clipboard
function copyCodeToClipboard48138() {
const code = editor48138.getValue(); // Retrieve code from the editor
navigator.clipboard.writeText(code).then(() => {
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function closeoutput48138() {
var code = editor48138.getSession().getValue();
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}
// Assign event handlers to the buttons
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document.getElementById("runBtn48138").addEventListener("click", runCode48138);
document.getElementById("closeoutputBtn48138").addEventListener("click", closeoutput48138);
Output:
Clarification: A class named ‘Intellipaat’ has been structured with an inner class, ‘Blogs’. __Name__ provides the name of the nested class; __qualname__ supplies it with its fully qualified designation, encompassing the outer class name.
Method 5: Utilizing the __qualname__ Attribute in Python
The __qualname__ attribute presents fully qualified names for classes, relative to their scope concerning nested classes.
Illustration:
Python
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document.getElementById("closeoutputBtn35814").addEventListener("click", closeOutput35814);
Output:
Explanation: The __qualname__ attribute provides the complete class names along with their parent classes, if nested. Here, it yields “Parent.Child” since Child is embedded within Parent.
Performance Assessment for Each Method
Method
Use Case
Approach
Performance
Utilizing __class__.__name__
Accessing the class name directly.
Direct attribute access (no function calls).
fastest
Utilizing type(obj).__name__
Obtaining the type of object.
Utilizes type() function + attribute access.
fastest
Employing a Decorator (@property)
Returning class name as a property.
Encapsulates logic via a property decorator.
moderate
Using Nested Classes with __qualname__
Using the name attribute to obtain the name of the class, sometimes including full paths.
Accesses nested class names via __name__.
Slightly slower
Using __qualname__ Attribute
The __qualname__ attribute also yields the entire class hierarchy.
Provides fully qualified names that include parent classes.
Slightly slower
Real-World Applications
Case 1: Logging and Debugging: In logging events for exceptions or system occurrences, the class plays a role in identifying the source of the issue that arises in that specific case. This becomes especially advantageous in intricate code structures, dealing with multiple classes that may contain similar operations and behaviors. For instance, when managing exceptions, retrieving class names enhances the detail provided in logs.
Case 2: Serialization and Deserialization: During the process of deserializing objects into XML or JSON, if class names are preserved, the accurate class instance would be reconstructed during deserialization. Consequently, APIs like Pickle rely on class names for object identification.
Case 3: Dynamic Method Invocation: In reflective programming, methods can be dynamically invoked at runtime. Therefore, obtaining class names can assist in accessing methods and fields, with common use cases found in dynamic behavior implementation and plugins.
Case 4: Automated Testing and Mocking: When utilizing mock frameworks such as unittest.mock, knowing the specific class name is essential for creating appropriate mocks, allowing the environment to closely mirror reality.
Conclusion
Acquiring an instance’s class name provides several benefits, including debugging, logging, and type verification. The simplest method for retrieving a class name is through __class__.__name__. Other techniques, such as using the @property decorator and __qualname__, are beneficial in nested situations. All these methods are elaborated upon to efficiently retrieve class names in Python.
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