Run Fortran code that prompts reading data in jupyter-notebook with python Restart kernel

Question

Jupyter notebook Restart when running a Fortran code requesting data entry, as follows:

note that the variable a must be provided immediately after the call from f1 .However, an error occurs and the Restart kernel :

Note: The code works fine without the declaration snippet from a and reading of a

Answer 1

Problem happens due to notebook jupyter unable to process standard input (stdin) in sub-processes.

Even if you execute a command shell (run, too, in a sub-process) that uses the standard input, the kernel will "crash" (eventually eminining a message from re-start or not).

Example, if you run the command below on a notebook cell:

in Windows:

!set /p variavel="Digite um valor "

or UNIX / OS X:

!read -p "Digite um valor " variavel

the kernel "hangs", waiting for input.

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A possible solution to this problem: read the input values in the Python code and send these values as parameters to the Fortran routine:

x=input("Valor X ")
y=input("Valor Y ")
a=input("Valor A ")
f1(x, y, a)