'module' object has no attribute 'to_bytes' Python

Question

Please advise how I can cx-freeze my python program which uses serial :

    import serial    
    import serial.tools.list_ports;

    print serial.tools.list_ports()

Here's my setup.py

import sys
from cx_Freeze import setup, Executable

    setup(
        name = "My test program",
        version = "3.1",
        description = "My test",
        executables = [Executable("pystest.py", base = "Win32GUI")])

After I build using cx_freeze, this is my error :

---------------------------
cx_Freeze: Python error in main script
---------------------------
Traceback (most recent call last):
  File "C:\Python27\lib\site-packages\cx_Freeze\initscripts\Console.py", line 27, in <module>
    exec(code, m.__dict__)
  File "pystest.py", line 1, in <module>
  File "C:\Python27\lib\site-packages\serial\tools\list_ports.py", line 27, in <module>
    from serial.tools.list_ports_windows import *
  File "C:\Python27\lib\site-packages\serial\tools\list_ports_windows.py", line 127, in <module>
    Ports = serial.to_bytes([80, 111, 114, 116, 115]) # "Ports"
AttributeError: 'module' object has no attribute 'to_bytes'

---------------------------
OK   
---------------------------

I'm not sure why I see this error. Any advise appreciated.

Here's a screenshot for easy reading :

Thanks.

added import serial. I still get the same error

Josh
– Josh

2015-08-29 08:28:58 +00:00
Commented Aug 29, 2015 at 8:28 — Josh
– Josh, Commented Aug 29, 2015 at 8:28

dsgdfg · Accepted Answer · 2015-08-29 09:22:53Z

1

import sys
from cx_Freeze import setup, Executable
path = ["pystest"]+sys.path

build_exe_options = {"packages": ["os","serial"], "excludes": ["tkinter"],"path":path}
#add more package what are using for your app?

base = None
if sys.platform == "win32":
    base = "Win32GUI"

setup(  name = "My test program",
        version = "3.1",
        description = "My test",
        options = {"build_exe": build_exe_options},
        executables = [Executable("pystest.py", base=base)])

edited Aug 29, 2015 at 9:22

answered Aug 29, 2015 at 8:43

dsgdfg

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3 Comments

Josh Over a year ago

I still get the same error. This makes no difference.

Josh Over a year ago

Added the path variable to my setup.py as you suggested.. Still does not work

Josh Over a year ago

Thank you for trying to help me. Please let me know if you have any thoughts on my solution

halfer · Accepted Answer · 2025-10-05 17:42:08Z

1

I actually ended up doing this:

Modifying the file list_ports_windows.py inside C:\Python27\Lib\site-packages\serial\tools and changed serial to serialutil like this :

Ports = serialutil.to_bytes([80, 111, 114, 116, 115]) # "Ports"
PortName = serialutil.to_bytes([80, 111, 114, 116, 78, 97, 109, 101]) # "PortName"

Then added from serial import serialutil to the imports

Not sure if this is the right way, but it worked.

edited Oct 5 at 17:42

halfer

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answered Aug 29, 2015 at 10:41

Josh

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3 Comments

dsgdfg Over a year ago

PortName = serial.to_bytes([80, 111, 114, 116, 78, 97, 109, 101]) # "PortName" Yes my library include this. Update your libraries on python ! What is verion ? my is 2.6

dsgdfg Over a year ago

Serial version ? inside ` init.py` ?

dsgdfg Over a year ago

On IDLE : import serial; serial.VERSION

hx78 · Accepted Answer · 2017-11-14 07:31:46Z

-1

Ports = serial.to_bytes([80, 111, 114, 116, 115]) # "Ports" no attribute 'to_bytes' two step:

1、pip install pyserial==3.4

2、pip install pyserial==2.7

i don't know the reason, but it worked

edited Nov 14, 2017 at 7:31

answered Nov 13, 2017 at 11:50

hx78

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