Why am I getting AttributeError: Object has no attribute
I have a class MyThread. In that, I have a method sample. I am trying to run it from within the same object context. Please have a look at the code:
class myThread (threading.Thread):
def __init__(self, threadID, name, counter,
redisOpsObj):
threading.Thread.__init__(self)
self.threadID = threadID
self.name = name
self.counter = counter
self.redisOpsObj = redisOpsObj
def stop(self):
self.kill_received = True
def sample(self):
print "Hello"
def run(self):
time.sleep(0.1)
print "n Starting " + self.name
self.sample()
Looks very simple ain't it. But when I run it I get this error
AttributeError: 'myThread' object has no attribute 'sample'
Now I have that method, right there. So what's wrong? Please help
If you are getting an object that has no attribute error then the reason behind it is because your indentation is goofed, and you've mixed tabs and spaces. Run the script with python -tt to verify.
Answer (1)
The "AttributeError: Object has no attribute" error occurs in Python when you try to access or call an attribute or method that does not exist on an object. Here’s how you can troubleshoot and resolve this issue:
1. Check Attribute Name
Ensure that the attribute or method name is spelled correctly. Python is case-sensitive, so a mismatch in case can cause this error.
Example:
class MyClass:
def __init__(self):
self.my_attribute = 42
obj = MyClass()
print(obj.my_atribute) # Typo: should be obj.my_attribute2. Verify Object Initialization
Make sure the object is properly initialized before you try to access its attributes or methods.
Example:
class MyClass:
def __init__(self):
self.my_attribute = 42obj = MyClass()
print(obj.my_attribute) # Correctly initialized3. Check Attribute Assignment
Ensure the attribute is being set correctly in the class or object.
Example:
class MyClass:
def set_attribute(self, value):
self.my_attribute = value
obj = MyClass()
obj.set_attribute(42)print(obj.my_attribute) # Ensure set_attribute is called before access4. Debug with dir()
Use the dir() function to list all the attributes and methods of the object to verify the presence of the attribute.
Example:
class MyClass:
def __init__(self):
self.my_attribute = 42
obj = MyClass()
print(dir(obj)) # Lists all attributes and methods5. Check for Inheritance Issues
If the attribute should be inherited from a parent class, make sure the parent class is correctly defined and the object is instantiated properly.
Example:
class ParentClass:
def __init__(self):
self.inherited_attribute = 42
class ChildClass(ParentClass):
pass
obj = ChildClass()print(obj.inherited_attribute) # Ensure correct inheritance
6. Verify Dynamic Attribute Assignment
If attributes are added dynamically, ensure they are added before accessing them.
Example:
class MyClass:
pass
obj = MyClass()
obj.dynamic_attribute = 42print(obj.dynamic_attribute) # Ensure dynamic attribute is set before access
Summary
To resolve the "AttributeError: Object has no attribute" error:
- Check the spelling of the attribute or method.
- Ensure proper initialization of the object.
- Verify attribute assignment.
- Use dir() to list attributes and methods.
- Check inheritance and object instantiation.
- Ensure dynamic attributes are set before access.
By following these steps, you can identify and fix the cause of the AttributeError in your Python code.