I've recently started programming in python for my job, so I'm quite new to it. My goal is to create a graphic interface so that the user can run a program that I have been developing in R. The interface is done using the Tkinter module from python (version 3.3).
The problem comes when I have to call the R interpreter from python to run an R file that is generated (run.R file). The curious thing is that this only happens when I try to run my script in Windows, not in Linux. In both cases, I am trying to use the os module from python.
This is the code that is not working for Windows:
os.chdir(outRW) #first I change the working directory to the one where the run.R file is
os.system("C:\R-3.6.1\bin\Rscript run.R")
When I execute this, it changes the directory successfully, but when it comes to calling the R interpreter, it shows me this error:
The filename, directory name, or volume label syntax is incorrect.
However, I have tried running the "C:\R-3.6.1\bin\Rscript run.R" command in the Windows Command Prompt and it works perfectly.
I have also tried adding the path to R to the environmental variables, but again I could only make it work in the Command Prompt, not with python.
I guess there is something very obvious that I am missing here, but I cannot see it.
Any help or comments are very much appreciated!
Thank you!
Use double backslashes.
In R you need to use double backslashes \\, otherwise it'll try to interpret it as an Escape Character.
Use this and it will work:
os.system("C:\\R-3.6.1\\bin\\Rscript run.R")
Hope this helps.
Related
I am trying to compile a .tex file in a Python script using pdflatex. The command pdflatex filename.tex works when I run it from the command line on Windows. However, attempting to run os.system("pdflatex filename.tex") just spits out 1 into the Python console and does not compile a pdf. I've also tried putting in the full file path similar to this person solved their problem but the same thing happens. Similarly, subprocess.call(['pdflatex', 'filename.tex']) just outputs a 1 and does not do anything.
It seems someone else has encountered the same problem in this thread, but on Mac instead of Windows. (But regardless of the operating system, they didn't find an answer.)
Why might this be happening?
EDIT: I've just discovered a solution. The script runs successfully (using the os.system approach) when I run the .py file using the command line. Previously I was attempting to run the script from RStudio, both using reticulate::source_python(filename) and also line-by-line via the reticulate REPL. Seems like the problem may actually be coming from R's reticulate package rather than anything to do with Python.
Fortunately RStudio has a terminal window so this doesn't end up being too inconvenient!
So I am relatively new to programming and used to use Python's own "IDLE". After I run a ".py" file with IDLE, I am used to getting a python shell or a command window, I don't really know the terminological name for it, where I could play around with the objects inside the script.
For example, if I had a list A=[1,2,3] inside the program, after I run it I get a command console that says ">>" and I can say ">>A" which gives me "[1,2,3]" and I can add elements to A etc.
Now, I want to start using VS Code but I can't seem to find that particular thing. I have a terminal where I can run python code if I give the command "python" first, but It doesn't seem to effect anything inside the script.
I want to use that to see if some objects are working fine and to check their types etc. I add more lines to code after I try from there first, if that makes sense.
Sorry for really bad terminology, I really don't know the names but I can try even more if it's not clear.
Thanks a lot in advance.
Are you looking for the Integrated Terminal of VS Code?
Here are some ways to open the terminal:
Use the ⌃` keyboard shortcut with the backtick character.
Use the View > Terminal menu command.
From the Command Palette (⇧⌘P), use the View: Toggle Integrated Terminal command.
In the window that shows up, enter python and you'll get the Python shell you're looking for.
Try using the integrated terminal inside vs code and make sure that python and pip are properly configured. Type python in the command line and make sure the terminal points to the same folder where your program file is located.
I have just written a bunch of lines of code on the Python prompt at the terminal. Now, I want to save all those lines of code to a .py file.
I am unable to find out how to do that. The only thing that I could find on StackOverflow was this answer but it shows only how to do it in an iPython notebook. I am not using an iPython notebook. I am running the code at the command line on the terminal.
I tried to follow that answer (because just in case) and ran the %save magic command on the terminal but it gave a SyntaxError.
So, how do save it?
Thanks!
See http://blog.e-shell.org/174 . As wu explains, the python prompt is using readline, and you can import a Python library to access this.
>>> import readline
>>> readline.write_history_file('/path/to/history.txt')
You can trying using another interpreter : bpython , I belive it has what you need,check it out.
Save the code you've entered to a file.
You seem to be affected by the misconception, that the python environment is workspace-centered (similar to what I know from Smalltalk and some LISP variants):
fire up with an initial workspace
modify by your liking
store the result
This is unfortunately not the case. While you can import existing files, the other option is to specify an existing file as initially to be loaded and keep the interpreter open by using the -i option.
It really depends on your terminal for the exact commands.
The general idea is to copy everything (if possible) or one page at a time from the terminal into a text editor and then clean the >>> prompts (and possibly other formatting problems) in the text editor.
But anyway, typing a lot of commands directly in the execution environment if really bad practice. At least you test a handful of lines and immediately save them in a file. IDLE is great at this game...
I am using Atom on Windows 10. While setting up Atom on my computer, I created a folder called "beyond basics". Then I created a python file. I installed platform io on Atom. i got a "+" icon on screen. upon clicking that i got a command line. I am trying to execute on that by writing python filename but I am getting an error. Any help is appreciated.
python3 myfile.py
Try typing myfile.py without the python prefix. It may work, as it works for me on Windows 10. Your bubble is covering up an error message that could help use debug. Can you add an edit and tell us the error message? Until then, just try the command without the python prefix.
You should also save before running, as was commented by Denis Fetinin.
If it still doesn't work, try addding python to the env variables. It's a simple process that you can follow here.
I am a complete noob when it comes to programming. I just downloaded python and I will be using Notepad ++. I have saved a file to my desktop and the file name is test and changed the extension from .txt to .py
So when I go to Notepad ++ and create a program and save it, I go to the cmd prompt making sure I am in my desktop directory and type the following
python test.py
and it tells me that python is not recognized. Any help to fix this problem would be greatly appreciated.
First thing python is indent oriented programing language and it comes with its default editor called IDLE. So if you use notepad++ instead of IDLE it might gives you a syntax error. Second thing for executing python file from command prompt,you need to setup environment variable.Please see below link for setting up environment variable.
https://docs.python.org/2/using/windows.html
You can directly run your program in IDLE without using command prompt. So i would suggest you to use pythons built in editor (IDLE)