I am making a python CLI that prompts user to enter input at certain times during its running. I want to use the input function for this but get EOFError: EOF when reading a line when it reaches the input() line.
I've done some testing and I think the problem is I am using a shebang on the script that makes it run with a specific condo environment. This is the minimal code needed to reproduce the problem
#!/usr/bin/env conda run -n TEST python
def main(): # testing
chromatogram_result = input()
print(chromatogram_result)
if __name__ == "__main__":
main()
where TEST is my conda environment name.
The issue occurs if I run this from the command line by simply invoking the file name
$ ./my_file.py
It also occurs if I run it from terminal using a command based on the shebang
$ conda run -n TEST python my_file.py
But doesn't occur if I activate the correct conda environment and then run it
$ conda activate TEST
$ python3 my_file.py
My question is why is this occurring and is there a better way to invoke a specific conda environment in a shebang to avoid this? Or do I have to use a normal shebang and remember to activate my environment each time I want to use the script?
This is on macOS 10.14.6, using conda 4.10.3. It doesn't seem specific to one conda environment, I've tried a few different ones on my system and all give the same error with this shebang
By default Conda buffers I/O on conda run. You'll need the --no-capture-output flag to get interactive I/O:
#!/usr/bin/env conda run -n TEST --no-capture-output python
def main(): # testing
chromatogram_result = input()
print(chromatogram_result)
if __name__ == "__main__":
main()
As for whether there is a better way: no, this is the best pattern I've seen for creating executable Python scripts that evaluate in specific Conda environments.