I am currently learning Python and I work on a project where I need a launcher to launch a series of the same script.
So, I have the launcher calling my other script, and I need the second script to import modules for it to work. But then I get the infamous ModuleNotFound: no module named "". When I launch the file myself, it works properly as intended and the module is found.
LAUNCHER
i=0
while i<1000:
print('Creating file number '+str(i)+'')
os.system('C:\\Users\\Gauthier\\Desktop\\file.py')
time.sleep(int(frequency))
print('File number '+str(i)+' created')
i+=1
I guess that must be a miscomprehension on my side, but after reading tens of questions on stackeoverflow and other forums, the official documentation and some tutorials, I can't find the proper way to import a module in a script which is itself launched by another file.
As file.py requests data from APIs, I cannot just read the script with
exec(open('file.py').read())
because I need multiple instances of the same script to be launched at the same time.
I am sorry if I missed something obvious, but it's been days -- I've uninstalled Python multiple times, tried a lot of different ways to call a file from another-- but I finally came here to ask for help.
Thanks!
I simple work around could be that you can add the path in
sys.path.append('/usr/lib64/python2.7/')
sys.path.append('<path to your modules>')
and then import your packages.
A similar statement can be used as many times and can be used to import your modules as well.
Related
I want to speed up my python code so i tried to translate it in c thanks to cython. I followed the basics tutorials and other youtube videos and i finally could create a functions_cython.c file. But somehow i just can't import it. I tried to import it in my main file, i also tried in another file named 'testing.py' but I always receive errors saying that the module 'functions_cython' does not exist, while it actually is in the file. Do you have any idea why ? (i linked some images if that can help)
The problem was because I was using PyCharm's "community version" and this version (in opposition of the professional one) does not allow to import .c formats. I switched to VS Code.
So I am trying to write some python code that will do two things, that seem to be mutually exclusive on my machine. My PC's host operating system is windows and I run Kali-Linux in WSL2 when I need to test my code on Linux. My code's main function creates two separate multiprocessing.Process objects, assigning a different thread, starting them both one after the other and then calling for them both to be joined. The plan is to allow each to run a simple server application simultaneously on different ports. This does not work when running python3 in PowerShell, as it seems to require access to os.fork() which doesn't work in said environment. When I found this out I pivoted to running in WSL2 which worked fantastically, for a time. After a while of experimenting with some ideas I decided to take some of my code and spin it off into its own file, which I placed in its own 'Libs' folder. WSL2 however, was unable to import this new file, instead giving me the exception ModuleNotFoundError: No module named 'NetStuff'. I originally had added:
sys.path.append('./Libs')
as has worked for me in the past, however when I found that WSL2 was unable to find my module, I printed out sys.path and it revealed that rather than appending my $current_working_directory/Libs like I intended, I was just appending the literal string, which wasn't useful. I then decided to try:
sys.path.append(str(pathlib.Path().resolve()) + '/Libs')
which at the bare minimum shows up as I would expect in sys.path. This, however still didn't work, python was unable to find my module and would unceremoniously crash every time. This led me to try something else, I ran my code in python3 under PowerShell again, which had no issue importing my module, it did still crash due to lacking os.fork() but the import gave no issues. Confused and annoyed I opened my code in IDLE 3.9 which, for some inexplicable reason, was able to import the file, and seemingly use os.fork(). The only major issue with running in IDLE is that it is seemingly incapable of understanding ascii colour escape characters. Given that the goal is to run my code in bash, and ideally also PowerShell, I am not satisfied with this as a solution. I returned to trying to fix the issue in WSL2 by adding my module to /home/Noah/bin, and appending this directory to sys.path, but this has still not so much as given me a new symptom.
I am utterly at a loss at this point. none of the fixes I know off hand are working, and neither are the new ones I've found online. I can't tell if I'm just missing something fundamental about python or if I'm running into a bug, if it's the latter, i can't seem to find other people with the same issue. As a result of my confusion and frustration I am appealing to you, kind users of stackoverflow.
The following is the snippet that is causing me problems in WSL2:
path0 = ('/home/Noah/bin')
path1 = (str(pathlib.Path().resolve()) + '/Libs')
sys.path.append(path0)
sys.path.append(path1)
print(sys.path)
import NetStuff
The following is output of print(sys.path) in WSL2:
['/mnt/c/Users/Noah/VSCodeRepos/Python/BlackPack', '/usr/lib/python39.zip', '/usr/lib/python3.9', '/usr/lib/python3.9/lib-dynload', '/home/noah/.local/lib/python3.9/site-packages', '/usr/local/lib/python3.9/dist-packages', '/usr/lib/python3/dist-packages', '/home/Noah/bin', '/mnt/c/Users/Noah/VSCodeRepos/Python/BlackPack/Libs']
The following is the error being thrown by WSL2:
Traceback (most recent call last):
File "/mnt/c/Users/Noah/VSCodeRepos/Python/BlackPack/BlackPackServer.py", line 21, in <module>
import NetStuff
ModuleNotFoundError: No module named 'NetStuff'
I am specifically hoping to fix the issue with WSL2 at the moment as I am fairly certain that getting the code to run on PowerShell is merely going to require rewriting my code so that it doesn't rely on os.fork(). Thank you for reading my problem, and if I left out any information that you would like to see just tell me and I'll add it in an edit!
Edit: I instantly realized that I should specify that my host machine is running windows 10.
module path lost in multiprocessing spawn (ModuleNotFoundError)
The so-called solution of inserting sys-path above the importing of the module does not work for me.
Here is my main.py
import multiprocessing
from testing import customfunction
customfunction(1,2,3)
if __name__ == "__main__":
process = multiprocessing.Process(target=customfunction)
process.start()
process.join()
print("DONE")
The main.py works fine up to process.start()
This means customfunction has been imported properly
Here is my testing.py
import random
def customfunction(size, test, hello):
random.seed(size)
print(random.random())
return random.random()
Both main.py and testing.py are in the same folder. A separate folder with an init.py file did not work as well.
I get this error:
from testing import customfunction
ModuleNotFoundError: No module named 'testing'
I can not wrap my head around why does the process created not retain the system pathing in order to import the file. If i place the multiprocessing creation in customfunction it doesn't work either, the same error occurs.
The link I shared at the top does not work for me as well.
Thank you for taking the time to read. If you believe this is a duplicate of another question, please link it and explain, I am new to python.
EDIT:
I am using Windows 10 as my OS
I have installed Spyder 4.1.4 using Anaconda Navigator, Python 3.7.7.
I installed using a executable package.
I have tested this code on VS Code as well.
I am running this via the two IDEs mentioned(E.G VS Code Powershell console and Spyder's Python Console by clicking run)
I generally currently believe it is an issue specific to my computer, and I'll like to know if its replicable in other Windows Systems and whether or not the linked "solution" in the first line works. With that I may be able to pinpoint my errors
This should work if you invoke multiprocessing.Process(target=customfunction, args=(1,2,3)) instead. I can't think of a reason why this would not work on Linux.
Can you update your question and provide the following information?
What OS are you using?
What version of Python are you running, and how was it installed?
How are you running main.py (e.g. from the command line, from an IDE, etc.)?
Any other details about your system configuration that might help others answer your question?
No multiprocessing print outputs (Spyder)
The solution mentioned here seems to solve my problem, I never expected either VS Code or Spyder's Console to have an issue with multiprocessing, but running the code in an external system terminal works.
Thank you to Melih Elibol for helping me think more clearly about the problem, I am new to python.
I'm new to Python and using PyCharm professional as my IDE. I have a small section of code that I want to work with from a longer file, so I created a "scratch file" with Python set as the interpreter. However, even just with importing modules I'm getting errors that the modules can't be found (even with standard modules). The file is set as a "Python" scratch file, so I'm not sure what else I need to do. The code I'm trying to run is:
from zipfile import ZipFile
import urllib
testfile = urllib.request.urlretrieve("https://ihmecovid19storage.blob.core.windows.net/latest/ihme-covid19.zip", "ihme-covid19.zip")
print("File saved at: " + (str(os.getcwd())))
with ZipFile('ihme-covid19.zip', 'r') as zipobj:
print(zipobj.printdir())
zipobj.extractall()
Everything is showing up with an error - no module urllib, no module zipfile, etc.
This may come across like a non-answer, but I do think this is a bug in Pycharm.
I even downloaded an update, restarted pycharm, and rebuilt my indexes. Same thing, here -- core Python modules are not registering as being importable (i.e. import sys or import inspect both failing type-checking).
We should probably move this to Pycharm's bug tracker. For example:
Here is a similar issue around a specific import NamedTuple
Here's an issue around the default interpreter in scratch files
There may be a better existing bug ticket, so please do look and report back here -- I'll update this comment if someone finds or creates a better bug ticket on youtrack.jetbrains.com and shares the link.
I’m having trouble using python’s multiprocessing module. This is the first time I’ve tried using the module. I’ve tried simplifying my processing to the bare bones, but keep getting the same error. I’m using python 2.7.2, and Windows 7.
The script I’m trying to run is called learnmp.py, and the error message says that the problem is that it can't find module learnmp.
import multiprocessing
def doSomething():
"""worker function"""
print 'something'
return
if __name__ == '__main__':
jobs = []
for i in range(2):
p = multiprocessing.Process(target=doSomething)
jobs.append(p)
p.start()
The error is :
File “<string>”, line 1, in <module> File “C:\Python27\ArcGISx6410.1\lib\multiprocessing\forking.py”, line 373,
in main prepare(preparation_data) File “C:\Python27\ArcGISx6410.1\lib\multiprocessing\forking.py”, line 482,
in prepare file, path_name, etc = imp.find_module (main_name, dirs)
ImportError: No module named learnmp
What’s causing the error, and how can I solve it?
EDIT: I still don't know what was causing the error, but changing the file name eliminated it.
I know it's been a while, but I ran into this same error, also using the version of Python distributed with ArcGIS, and I've found a solution which at least worked in my case.
The problem that I had was that I was calling my program name, Test.py, as test.py. Note the difference in case.
c:\python27\arcgisx6410.2\python.exe c:\temp\test.py
c:\python27\arcgisx6410.2\python.exe c:\temp\Test.py
This isn't normally an issue if you're not using the multiprocessing library. However, when you write:
if __name__ == '__main__':
what appears to be happening is that the part of the program in main is being bound to the name of the python file. In my case that was test. However, there is no test, just Test. So although Windows will allow case-incorrect filenames in cmd, PowerShell, and in batch files, Python's multiprocessing library balks at this and throws a nasty series of errors.
Hopefully this helps someone.
Looks like you might be going down a rabbit-hole looking into multiprocessing. As the traceback shows, your python install is trying to look in the ArcGIS version of python before actually looking at your system install.
My guess is that the version of python that ships with ArcGIS is slightly customized for some reason or another and can't find your python script. The question then becomes:
Why is your Windows machine looking in ArcGIS for python?
Without looking at your machine at a slightly lower level I can't quite be sure, but if I had to guess, you probably added the ArcGIS directory to your PATH variable in front of the standard python directory, so it looks in ArcGIS first. If you move the ArcGIS path to the end of your PATH variable it should resolve the problem.
Changing your PATH variable: http://www.computerhope.com/issues/ch000549.htm
Microsoft Visual C++ 9.0 is required for some python modules to work in windows,so download below package it will work.
http://aka.ms/vcpython27
This package contains the compiler and set of system headers necessary for producing binary wheels for Python 2.7 packages.