Develop Reference

How to specify the path of Python Script located locally OR within Karate project in karate.exec() command?

I want to execute a python script which is located either:
On my Local System or,
Within the Karate project itself
My question is how to specify the paths of the above scripts location into karate.exec() command. I Tried giving the path but while executing it says working directory: null and python: can't open file + No such file or directory

The karate.exec() also takes a JSON argument where you can provide a workingDir. For example, I just tried this and it worked:
* def result = karate.exec({ args:['./netbeans'], workingDir: '/Users/peter/dev/netbeans/bin' })
Note that I am on a Mac, so you can adjust directory and executable paths accordingly.
You can refer this other answer for more details and tips: https://stackoverflow.com/a/62911366/143475

Calling other scripts in PyPI package

I have a Python package that I have uploaded to PyPP. The script calls two additional R scripts to run. I have verified that the required R scripts are also uploaded to PyPI (by physically downloading the latest version and seeing them present in the directory). I also can successfully install and run the main python script.
However, I am having trouble figuring out how to call the R scripts from within the Python script. That is, what directory structure do I use? Here is the command I use to run:
$ python_script -f file1.txt -g file2.txt
and I get this error:
Fatal error: cannot open file 'script.r': No such file or directory
In the Python script, here is how I am calling the R script:
cmd = [ 'Rscript', 'python_script/Rscript.r' ]
output = subprocess.Popen(cmd, stderr=subprocess.PIPE).communicate()
result = output[1].decode('utf-8')
But nothing I try works: I've tried just 'Rscript.r' and './Rscript.r'
I'm at a loss as to how to correctly call this script. It is in the same directory as the main python_script I am running.

The path here would be relative to where you're invoking python_script from, but your R scripts exist in a directory relative to where your package has been installed.
You can use __file__ to determine the full path to the file which is being executed. By splitting this, you can get a path to the directory where the package was installed, and then add any additional directories/filenames to get a full path to your R script:
import os
this_dir, this_filename = os.path.split(__file__)
RSCRIPT_PATH = os.path.join(this_dir, "Rscript.r")
cmd = ['Rscript', RSCRIPT_PATH]
output = subprocess.Popen(cmd, stderr=subprocess.PIPE).communicate()
result = output[1].decode('utf-8')
Note: Best practice to ensure cross-platform compatibility here is to use os.path.join('path', 'to', 'file.txt') to generate a path instead of path/to/file.txt, since not all platforms use / as a path separator.

Why does Numpy.loadtxt work when called from IDLE and gives an IOError when called from shell?

I try to do the following:
1 VBA script calls shell using
RetVal = Shell(fullpythonexepath & fullscriptpath)
2 Shell get follwing command
fullpythonexepath & fullscriptpath
3 Python Script
import numpy as np
thefilepath = "input.txt" # is in the same folder as the script
theoutputpath = "output.txt" # is in the same folder as the script
ssc=np.loadtxt(thefilepath, delimiter='\t', skiprows=0, usecols=range(2)) #error line
#some other code to fit input data
np.savetxt(theoutputpath, sscnew, header=top, fmt='%1.2f\t%1.2f')
When I run this the output file doesn't get printed, which means the script doesn't run properly.
Now to the funny thing: When I run the python script from IDLE it runs fine. When I run it from the shell using the command:
fullpythonexepath & fullscriptpath
it says :
I tried inputting the fullpath to the input.txt and output.txt. When I do this and run it in the IDLE it does not find the file anymore. When called from the shell it doesn't work either.
Python obviousely does not find the path to the input.txt
the issue is, to my understanding, not related to VBA. The error occures also when using shell commands
Solution was to put :
import os
os.chdir(r"fullpath")
into my script this changes the current working directory to my path and then input.txt gets found.

When you start the script from shell the working directory for the script will be the directory from which it is called upon.
Most IDLE define their own working directory.
To check I suggest doing:
os.getcwd()
in both cases and look what directory is used in both cases

Python can't run absolute script?

I encountered such a weird situation:
naivechou#naivechou/~>python test.py
test
naivechou#naivechou/~>pwd
/home/naivechou
naivechou#naivechou/~>python /home/naivechou/test.py
C:\toolchain\python\python.exe: can't open file '/home/naivechou/test.py': [Errno 2] No such file or directory
My working directory is /home/naivechou/, test.py is in there.
If I run test.py with absolute path, I'll get an error message of No such file or directory.But everything will be fine if I enter that directory and then run it. What's wrong with python?

Try moving into the folder where the python script is located and do a "ls" command there in Linux. if windows then do 'dir'. if you see the required file there then execute the following command
C:\location_where_the_script_is> python yourfile.py

For commands entered on the command line, Windows doesn't recognize forward-slashes as directory separators.
Your second example is looking in the current directory for the literal filename /home/naivechou/test.py, and of course such a filename does not exist.
Use backslashes instead, as is the Windows way:
python \home\naivechou\test.py

Python not opening text files when they are in the same directory as script

I'm trying to open a file in python. Simple enough. The script that I am using is the same directory as my code, so I just use
myfile = open('file.txt', 'r')
This worked fine before, but now I am getting the error 'No such file or directory' (Errno2)
Why is this happening? I've used OS to check if I am in the right directory, and it is fine. What is python doing differently now than it did 20 minutes ago, when it found the file perfectly??

Assuming the file you are trying to open/read has appropriate permissions, the behavior is defined based on how you are invoking your python program. Let's assume your code and the file.txt are in ~/Desktop
If you are in ~/Desktop and do a python code.py your code will work fine. But if you are in say your home folder - ~ and do a python ~/Desktop/code.py then the python interpreter assumes your current working directory to be ~ and will return the error:
IOError: [Errno 2] No such file or directory: 'file.txt'
since it will not find file.txt in ~
Further, in the context of the given example:
os.getcwd()
returns the absolute path of your home directory and
os.path.realpath(__file__)
returns the absolute path of your python source file

Is it possible you are typing the name wrong, eg "test.fna" versus "test.fna.txt"?