Even if you're a seasoned Python developer, you'll occasionally encounter errors that can be pretty confusing. One such error is the
AttributeError: module object has no attribute 'Serial'. This Byte will help you understand and resolve this issue.
Understanding the AttributeError
AttributeError in Python is raised when you try to access or call an attribute that a module, class, or instance does not have. Specifically, the error
AttributeError: module object has no attribute 'Serial' suggests that you're trying to access the
Serial attribute from a module that doesn't possess it.
For instance, if you have a module named
serial and you're trying to use the
Serial attribute from it, you might encounter this error. Here's an example:
import serial ser = serial.Serial('/dev/ttyUSB0') # This line causes the error
In this case, the
serial module you're importing doesn't have the
Serial attribute, hence the
Note: It's important to understand that Python is case-sensitive.
serial are not the same. If the attribute exists but you're using the wrong case, you'll also encounter an
Fixes for the Error
The good news is that this error is usually a pretty easy fix, even if it seems very confusing at first. Let's explore some of the solutions.
Install the Correct pyserial Module
One of the most common reasons for this error is the incorrect installation of the
pyserial module. The
Serial attribute is a part of the
pyserial module, which is used for serial communication in Python.
You might have installed a module named
serial instead of
pyserial (this is more common than you think!). To fix this, you need to uninstall the incorrect module and install the correct one.
pip uninstall serial pip install pyserial
After running these commands, your issue may be resolved. Now you can import
pyserial and use it in your code:
from pyserial import Serial ser = Serial('/dev/ttyUSB0') # This line no longer causes an error
If this didn't fix the error, keep reading.
Rename your serial.py File
For how much Python I've written in my career, you'd think that I wouldn't make this simple mistake as much as I do...
Another possibility is that the Python interpreter gets confused when there's a file in your project directory with the same name as a module you're trying to import. This is another common source of the
Let's say, for instance, you have a file named
serial.py in your project directory (or maybe your script itself is named
serial.py). When you try to
import serial, Python might import your
serial.py file instead of the
pyserial module, leading to the
The solution here is simple - rename your
serial.py file to something else.
mv serial.py my_serial.py
In this Byte, we've explored two common causes of the
AttributeError: module object has no attribute 'Serial' error in Python: installing the wrong
pyserial module, and having a file in your project directory that shares a name with a module you're trying to import. By installing the correct module or renaming conflicting files, you should be able to eliminate this error.
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