Python AttributeError: 'module' object has no attribute 'Serial' [duplicate]

I'm trying to access a serial port with Python 2.6 on my Raspberry Pi running Debian. My script named serial.py tries to import pySerial:

import serial
ser = serial.Serial('/dev/ttyAMA0', 9600)
ser.write("hello world!")

For some reason it refuses to establish the serial connection with this error:

AttributeError: 'module' object has no attribute 'Serial'

When I try to type the same code in the interactive Python interpreter it still doesn't work.

Strangely, it used to work about a couple hours ago.

What could be the problem? I've tried to fix this for a while, installing pySerial again, rewriting my code, double-checking the serial port, etc.

10

8 Answers

I'm adding this solution for people who make the same mistake as I did.

In most cases: rename your project file 'serial.py' and delete serial.pyc if exists, then you can do simple 'import serial' without attribute error.

Problem occurs when you import 'something' when your python file name is 'something.py'.

9

I accidentally installed 'serial' (sudo python -m pip install serial) instead of 'pySerial' (sudo python -m pip install pyserial), which lead to the same error.

If the previously mentioned solutions did not work for you, double check if you installed the correct library.

7

You're importing the module, not the class. So, you must write:

from serial import Serial

You need to install serial module correctly: pip install pyserial.

7

You have installed the incorrect package named 'serial'.

• Run pip uninstall serial for python 2.x or pip3 uninstall serialfor python 3.x
• Then install pyserial if not already installed by running pip install pyserial for python 2.x orpip3 install pyserial for python 3.x.

1

This problem is beacouse your proyect is named serial.py and the library imported is name serial too , change the name and thats all.

1

If you are helpless like me, try this:

List all Sub-Modules of "Serial" (or whatever package you are having trouble with) with the method described here: List all the modules that are part of a python package

In my case, the problems solved one after the other.

...looks like a bug to me...

Yes this topic is a bit old but i wanted to share the solution that worked for me for those who might need it anyway

As Ali said, try to locate your program using the following from terminal :

 sudo python3 import serial

print(serial.__file__) --> Copy

CTRL+D #(to get out of python)

sudo python3-->paste/__init__.py

Activating __init__.py will say to your program "ok i'm going to use Serial from python3". My problem was that my python3 program was using Serial from python 2.7

Other solution: remove other python versions

Cao

Sources :

Tryhard

This error can also happen if you have circular dependencies. Check your imports and make sure you do not have any cycles.