AttributeError: 'int' object has no attribute 'X' (Python)

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Borislav Hadzhiev

Last updated: Apr 20, 2022

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AttributeError: 'int' object has no attribute 'X' (Python) #

The Python "AttributeError: 'int' object has no attribute" occurs when we try to access an attribute that doesn't exist on an integer. To solve the error, make sure the value is of the expected type before accessing the attribute.

attributeerror int object has no attribute

Here is an example of how the error occurs.

main.py
example = 123 print(type(example)) # 👉️ <class 'int'> # ⛔️ AttributeError: 'int' object has no attribute 'startswith' result = example.startswith('12')

We tried to call the startswith() method on an integer and got the error.

If you print() the value you are accessing the attribute on, it will be an integer.

To solve the error, you need to track down where exactly you are setting the value to an integer in your code and correct the assignment.

To solve the error in the example, we would have to convert the integer to a string to be able to access the string-specific startswith() method.

main.py
example = 123 result = str(example).startswith('12') print(result) # 👉️ True

Most commonly the error is caused by reassigning a variable to an integer somewhere in your code.

main.py
nums = [1, 2, 3] # 👇️ reassignment of nums to an integer nums = 1 # ⛔️ AttributeError: 'int' object has no attribute 'append' nums.append(4) print(nums)

We set the nums variable to a list initially but later assigned an integer to it.

To solve the error in this scenario, we have to remove the reassignment or correct it.

main.py
nums = [1, 2, 3] nums.append(4) print(nums) # 👉️ [1, 2, 3, 4]

If you need to check whether an object contains an attribute, use the hasattr function.

main.py
example = 5 if hasattr(example, 'lower'): print(example.lower()) else: print('Attribute is not present on object') # 👉️ this runs

The hasattr function takes the following 2 parameters:

NameDescription
objectThe object we want to test for the existence of the attribute
nameThe name of the attribute to check for in the object

The hasattr() function returns True if the string is the name of one of the object's attributes, otherwise False is returned.

Using the hasattr function would handle the error if the attribute doesn't exist on the object, however you still have to figure out where the variable gets assigned an integer value in your code.

A good way to start debugging is to print(dir(your_object)) and see what attributes the object has.

Here is an example of what printing the attributes of an integer looks like.

main.py
example = 5 # [..., 'as_integer_ratio', 'bit_count', 'bit_length', 'conjugate', 'denominator', 'from_bytes', 'imag', 'numerator', 'real', 'to_bytes'...] print(dir(example))

If you pass a class to the dir() function, it returns a list of names of the class's attributes, and recursively of the attributes of its bases.

If you try to access any attribute that is not in this list, you would get the "AttributeError: int object has no attribute error".

To solve the error, either convert the value to the correct type before accessing the attribute, or correct the type of the value you are assigning to the variable before accessing any attributes.

Conclusion #

The Python "AttributeError: 'int' object has no attribute" occurs when we try to access an attribute that doesn't exist on an integer. To solve the error, make sure the value is of the expected type before accessing the attribute.

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