I'm using Python 3 on windows I'm trying to install a package from within a script.
The purpose is that I don't want to explain to the person I'm sending the script how to install the packages he needs, so I'm hoping to do it on the fly from within the script.
Here's my code:
import pip
pip.main(["install", 'pyetrade'])
import pyetrade
Everything installs correctly with pip.main, however it doesn't move on to "import pyetrade" or the rest of the code. It just hangs there.
Any ideas how to get around this? This also seems to happen when I use the command propt -- it seems to just hang after installation.
Related
I have been using python in VS Code for a while, everything was smooth. But yesterday I accidentally pressed "Run CC Cleaner" on my PC. This, among other things must have cleared some VS Code cache and I no longer can run scripts.
In cmd for example it says that "pandas can not be found" while pip says that it definitely is installed.
Running !python - m pip install pandas in VS Code just does not do anything.
Something must have severed the connection between python and VS Code.
The Python and the Python Extension do not have some connections, the Python Extension just needs to find the path of the Python.
It looks like an environment problem. Could you check which pip you are using with the command of pip --version?
But I was confusing of python - m pip install pandas in VS Code just does not do anything, could you explain it clearly?
Apologies if this is a very stupid question but I am new to python and although I have done some googling I cannot think how to phrase my search query.
I am writing a python script that relies on some libraries (pandas, numpy and others). At some point in the future I will be passing this script onto my University so they can mark it etc. I am fairly confident that the lecturer will have python installed on their PC but I cannot be sure they will have the relevant libraries.
I have included a comments section at the top of the script outlining the install instructions for each library but is there a better way of doing this so I can be sure the script will work regardless of what libraries they have?
An example of my script header
############### - Instructions on how to import libraries - ###############
#using pip install openpyxl using the command - pip install openpyxl
#########################################################################
import openpyxl
import random
import datetime
Distributing code is a huge chapter where you can invest enormous amounts of time in order to get things right, according to the current best practices and what not. I think there is different degrees of rightness to solutions to your problem, with more rightness meaning more work. So you have to pick the degree you are comfortable with and are good to go.
The best route
Python supports packaging, and the safest way to distribute code is to package it. This allows you to specify requirements in a way that installing your code will automatically install all dependencies as well.
You can use existing cookiecutters, which are project-templates, to create the base you need to build packages:
pip install cookiecutter
cookiecutter https://github.com/audreyr/cookiecutter-pypackage
Running this, and answering the ensuing questions, will leave you with python code that can be packaged. You can add the packages you need to the setup.py file:
requirements = ['openpyxl']
Then you add your script under the source directory and build the package with:
pip wheel .
Let's say you called your project my_script, you got yourself a fresh my_script-0.1.0-py2.py3-none-any.wheel file that you can send to your lecturer. When they install it with pip, openpyxl will be automatically installed in case it isn't already.
Unfortunately, if they should also be able to execute your code you are not done yet. You need to add a __main__.py file to the my_script folder before packaging it, in which you import and execute the parts of your code that are runnable:
my_script/my_script/__main__.py:
from . import runnable_script
if __name__ == '__main__':
runnable_script.run()
The installed package can then be run as a module with python -m my_script
The next best route
If you really only have a single file and want to communicate to your lecturer which requirements are needed to run the script, send them both your script and a file called requirements.txt, which contains the following lines:
openpyxl
.. and that's it. If there are other requirements, put them on separate lines. If the lecturer has spent any amount of time working with python, they should know that running pip install -r requirements.txt will install the requirements needed to run the code you have submitted.
The if-you-really-have-to route
If all your lecturer knows how to do is entering python and then the name of your script, use DudeCoders approach. But be aware that silently installing requirements without even interactive prompts to the user is a huge no-no in the software-engineering world. If you plan to work in programming you should start with good practices rather sooner than later.
You can firstly make sure that the respective library is installed or not by using try | except, like so:
try:
import numpy
except ImportError:
print('Numpy is not installed, install now to continue')
exit()
Now, if numpy is installed in his computer, then system will just import numpy and will move on, but if Numpy is not installed, then the system will exit python logging the information required, i.e., x is not installed.
And implement the exact same for each and every library you are using.
But if you want to directly install the library which is not installed, you can use this:
Note: Installing libraries silently is not a recommended way.
import os
try:
import numpy
except ImportError:
print('Numpy is not installed, installing now......')
resultCode = os.system('pip install numpy')
if resultCode == 0:
print('Numpy installed!')
import numpy
else:
print('Error occured while installing numpy')
exit()
Here, if numpy is already installed, then the system will simply move on after installing that, but if that is not installed, then the system will firstly install that and then will import that.
I have installed the module pynauty via https://web.cs.dal.ca/~peter/software/pynauty/html/install.html. Everything seemed to work, and I believe that it is fully installed. However, when I try importing it in python shell, it says there is no module named pynauty. I think I am missing a final step in installing. Does anyone know what that final step would be?
I just grappled with this problem myself. As creimers pointed out, the setup script calls pip install --user . which installs pynauty in ~/.local/lib/pythonX.X/site-packages.
What you probably want is to have it installed in /usr/bin/python (or whatever pops up when you type which python). Assuming you already called make user-ins, all you need to do is run
sudo pip install .
from inside where you extracted and built your pynauty.
Okay, so, I'm actually a beginner in programming Python, and I only found out yesterday how you were supposed to encode pip install ModuleName in the Python command line and not in the interactive shell. I'm trying to download a lot of modules, such as the Send2Trash module, Pyperclip, Requests, Beautiful Soup, and Selenium.
Before I checked the forums about installing modules, I found out how we needed to have the pip tool. I'm a Windows user, but for some reason, I didn't have the 'Scripts' folder installed when I downloaded Python. I didn't know we needed it, so I used raw scripts from GitHub, setup.py, and copy pasted the script into the File Editor in Python, ran it in the interactive shell, and tried to import the module I needed. It worked for the Pyperclip and the Requests module; no errors popped up after I imported them using import pyperclip or import requests, but when I tried the same procedure for the rest of the modules I needed, there were some errors.
Also, when I tried to download the modules on pypi.python.org, I tried to open it using the interactive shell, but then something pops up, 'The file's encoding is invalid for Python3.x...', and when I click 'OK', it's going to say 'Failed to Decode', and close everything.
So, after reading forum after forum, I found out how to download pip, and was also able to download setuptools and wheel. I'm not sure if it's really already downloaded, but I was able to get the 'Scripts' folder that wasn't there before, so I guess so. I also already went into my PATH using the edit environment for your account thing, and I edited the Path variable so its value would lead to my 'Scripts' folder. Please do tell me if I did the right thing here.
So, following the advice of the forums, I tried to install the modules I needed by typing pip install ModuleName in the Python command line instead of the interactive shell, but it still gave me a Syntax Error. I also tried it in Command Prompt, typing the same code pip install ModuleName, but when I clicked Enter, nothing happens; no errors or anything. It seemed like my install was accepted, but when I tried importing the module in the interactive shell, it still gave an Import Error.
Please tell me what I did wrong throughout my process, and how to properly install the modules I need. I would include pictures into this, but it seems I can only add two before my reputation becomes 10, and I'm pretty new here, so... If there's anything I need to elaborate on about my problem, don't hesitate to ask, and I'll try my best.
You say you use windows so you need to understand pip.
pip is a program that installs python modules. You can even use easy_install instead of pip.
some pip commands
pip list -- lists out already installed modules.
pip search <module name> -- searches new modules.
pip -h -- more pip commands you want.
pip installs modules from CMD prompt not from python shell.
Even after installing modules some modules doesn't run as import module
they need to be imported as from module import function.
refer the pip help command and install modules.
DO NOT SAVE SCRIPT FILES IN PYTHON ROOT FOLDER YOU MAY FACE SOME PROBLEMS
Happy Programming!!!
After a whole lot of searching and trying out, I found the solution to my problem. For future Python users who encounter the same thing: always install your modules in the root folder.
In my case, my Command Prompt was automatically inside the C:\Users folder, which caused some problems because I couldn't download my module in there. Once I typed in cd C:\Python34, which was my root folder, I could successfully download the modules I needed using pip install ModuleName.
I would like to use scheduler in my python program however I haven't been able to install it.
I tried with Easy_Install and PIP (neither of which I've used before) and I can't find a link for another method. I'm using Python 2.7 on Windows Vista
Since I've never used PIP before I had to install that first. After installing pip I went to command prompt, changed to the directory with pip and typed:
C:\Python27\Scripts>pip install apscheduler
It didn't come up with an error so I assumed it installed, however when I run my python program, which includes the line: from apscheduler.scheduler import Scheduler
it states:
ImportError: No module named apscheduler.scheduler
and when I look at the list of installed modules in Idle it's not there.
It's probably something obvious since I don't have a lot of experience in programming yet.
Help would be much appreciated!
sm
Hi again,
I got it working finally, in the end I didn't use PIP, in case other people need help this is what I did:
Downloaded the apscheduler tar.gz file
Downloaded 7-zip, since this can extract tar.gz files on Windows.
Extracted the tar.gz file using 7-zip, I had to do this twice since the first time I clicked extract it extracted to a .tar file (APScheduler-2.1.2.tar), it was necessary to extract this file as well.
Added C:python27\ to the windows path (this is in control panel->system & maintenance->system->advanced system settings->environment variables)
(I also added C:python27\scripts\ to the path, but not sure whether this makes a difference.
Opened command prompt and moved to the folder containing the extracted APScheduler files including the file named setup.py
In my case this was- C:\Python27\APScheduler\APScheduler-2.1.2\APScheduler-2.1.2\
In command prompt typed> python setup.py install
Hopefully this was everything, perhaps one day I'll delete everything and try again to check, but it took quite sometime to get it going so right now I think I'll leave it as is.