Edited to include a specific example
I am learning to use python and work in a windows 10 environment (although on 3 separate computers). I have gotten past the "add python to %PATH% issue" but continue to see odd outcomes when I call simple scripts from powershell compared to running them from the python terminal. For example, I often see that lines of code are duplicated, even simple print statements. A second repeating issue is that some (but not all) modules work fine in the python terminal but can't be found when running a script from powershell, despite using pip install within powershell to install it in the first place.
Rather then seeking help on a specific issue, I'm hoping for some guidance into how powershell and python interact that might help me understand or identify some commonalities in these issues I keep experiencing that are common from within powershell. If thats as simple as redirecting me towards another source even that'd be apprecaited. But my search results always turn up the common issue of powershell not knowing what python is, and needing to add python to the PATH. But as indicated, I have already gotten past this and can get %50 of my python to work from powershell. There must be something else perhaps obvious to others that I'm missing that can help me understand why some things aren't working while others are.
Thanks for taking the time to consider my problem and any advice is greatly apprecaited.
Here is an example from some code I am trying to get working, but in troubleshooting I have taken out a lot of code and am now only running what is shown that defines a dataframe and a print statement. Everything works line by line in python, but when I call the script from powershell, the print statement executes twice.
#!/usr/bin/python3
import pandas as pd
joedata = {'fpr': [0.2,0.4,0.8], 'tpr':[0.9,0.5,0.1]}
joeframe = pd.DataFrame(data=joedata)
print(joeframe)
Concerning modules, you probably have multiple versions of Python installed on your system. Calling pip in the Powershell doesn't mean that it will install for the Python installation which is called by default when you execute Python in the Powershell. So you should try to figure out on which version pip is installing packages and which version is actually used when executing a script.
EDIT: I tested the example that you gave in Powershell and I don't have the problem, it's working fine.
Moreover, for me, without doing any special configuration, in Powershell the commands pip and python refer to the same version of Python. If by default everything is ok, you should consider uninstalling Python and just running the installer again and let it manage the PATH, etc.
Related
I've got a script that requires python3.7 or above.
I've got multiple systems each with different python versions. all of them have either python3.7 or python3.8 but just "python3" can also be python3.6.
Is there a way to make a shebang line take either python3.7 or python3.8? and fail if none exist of course.
I tried a billion of options and nothing works. I was hoping for something like:
#!/usr/bin/python3.7 || /usr/bin/python3.8
or
#!/usr/bin/python3.7
#!/usr/bin/python3.8
but nada.. I also couldn't google it up which kinda makes me sad but who knows maybe the answer is there somewhere and I'm just using a bizarre jargon
these are not systems I can change defaults on and installing python3.7 on each such setup is sadly not an option (would make life awesome).
The shebang simply needs to point to an actual executable.
That executable can be one which finds a suitable version of the Python interpreter; see for example the py tool which was popular on Windows for a long time but which is now also being made available on real computers. other platforms.
Ultimately, something somewhere needs to be on the user's PATH, which obviously you will not always have control over. If you are targeting unsophisticated users, perhaps look into providing your code in a compiled executable, a prepackaged Docker image, or something vaguely like that.
I am trying since many hours, after watching several tutorials and reading many blogs I've setup variables as shown by them. Tried all of their methods to setup python3.9 on my windows cmd, but failed. I'm sharing some screenshots of my system variables and other things, please look into the problem and help me.
When you want to share on your post the errors you are getting, please insert them using the Code Sample function so that we can clearly read your errors and have a clear look at your situation.
Anyways, when you first install Python you have to option to automatically add Python to PATH, try uninstalling and checking that option.
If this doesn't work, paste inside your post the error you are getting.
EDIT: Can you share a screenshot of your Python directory?
I've encountered this issue with two separate modules now, one that I attempted to download myself (Quartz; could probably be the way I installed it, but let's ignore this scenario for now) and another that I installed using pip install (Pandas; let's focus on this one).
I wrote a two-line script that includes just import pandas and print('test'), for testing purposes. When I execute this in the terminal, instead of printing test to confirm the script runs correctly, it prints the docstring for another completely unrelated script:
[hidden]~/Python/$ python3 test.py
Usage: python emailResponse.py [situation] - copy situation response
The second line is a docstring I wrote for a simple fetch script for responding to emails, which is unrelated. What's worse is, if I just envoke Python3 in the terminal, and try import pandas, it'll print that same docstring and take me out of Python3 and back into the terminal shell / bash (sorry if this is not the right verbiage; still learning). The same results happen trying import Quartz as well, but no other modules are impacted (at least, that I'm aware of).
I'm at a complete loss why this might be the case. It was easy enough to avoid using Quartz, but I need Pandas for work purposes and this issue is starting to directly affect my work.
Any idea why this might be the case?
I want to use visual for my project. I've used it many times before and everything was just fine, but I recently changed jobs so am using it on a machine that I've never worked on before
The problem is somewhat peculiar: when I run one of the example scripts from /visual/examples everything is just fine. However when I try to run a very simple script:
import visual
visual.sphere(pos=[0.,0.,0.],radius=1.,color=visual.color.red)
it takes a couple minutes to execute. This is completely unacceptable for the project I want to use it for.
I've tried running this sort of scripts from command line and IPython but the behaviour is the same: a visual window appears, Windows tags the window as "not responding" and then, after some painfully long time, the entire scene appears as expected.
This is clearly not a problem with what IDE I use to call visual and I'm seriously clueless about how to solve this. If that's of any importance I'm using a 64 bit Windows (also downloaded 64b visual) and a Python distribution that comes with Anaconda.
An interesting observation: The Python interpreter from which I run the script is not busy, i.e. I can execute other commands in it while the visual scene is not displaying correctly.
Any help or even ideas on what to do to try and resolve this issue would be very much appreciated.
Do you have either a visual.sleep(pause_time) or visual.rate(frequency) line somewhere in your visualization loop? VPython requires one of these two lines to update the animation window.
I would start from scratch with a base python distribution/implementation.
Try downloading first a stock 64-bit Windows Python-2.7.5 : http://python.org/ftp/python/2.7.5/python-2.7.5.amd64.msi
Then download VPython-Win-64 : http://sourceforge.net/projects/vpythonwx/files/6.05-release/VPython-Win-64-Py2.7-6.05.exe/download
If this doesn't work, then it might be an issue with something other than vpython or anaconda.
If you can get it to work properly, then you can isolate the problem to either Anaconda's python implementation or the VPython module itself.
I write Python programs with eclipse IDE in Linux Backtrack5.
Scapy,Python 2.6 are available in Backtrack.Using auto-completion feature I've seen in all modules,But when i run the program, I see the following error:
from scapy.contrib.ospf import OSPF_Hdr
ImportError : No module named contrib.ospf
I've just started programming with Python, and many of the sources that I've encountered this problem.
The problem for me is very interesting, when coding everything is OK, but it is not running!
In addition to resolving this problem, I want to know why this problem occurs??And in general how to fix?
Maybe my question is a duplicate, but a complete solution and we need it, in which case it does not duplicate any other person who asks the question.
Your search path is wrong.
2 common causes are:
Pythonversions in development and execution are different. Are you sure you use python2.6 both times? Because not all packages are available for all versions of python.
-the search path in your IDE is different from the search path in your shell. I don't have experience with eclipse for python, but it happened to me with other IDEs.
So in bash you can write:
export PYTHONPATH="$PYTHONPATH:/where/module/lives/"
to include the path.
How to include this in your bashprofile:
http://blog.streamitive.com/2011/12/01/export-pythonpathpythonpath/
You can include the path via python itself:
http://www.johnny-lin.com/cdat_tips/tips_pylang/path.html
When to include via bash and when to include via python itself:
include via python for controlled programms, when you know 100% your module will always be in the same location.
Else, you should set the path explicitly. Maybe in a startup shell script, in the crontab command, or wherever you are calling your python program.
The PYTHONPATH the IDE is using isn't the same as the PYTHONPATH you are running the program with