Python: executing a terminal command from jupyter notebook

Question

I want to run C++ simulations from a jupyter notebook. The program needs three values in input, i.e. 10, 0.2 and 0.6.

This what I am doing now and it works fine:

## Compile
! mpicxx -o main main.cpp Node.cpp Agent.cpp -std=gnu++11
## Run
! mpirun -np 1 ./main 10 0.2 0.6

But if try to declare those values before, it does not recognizes them.

a = 10
b = 0.2
c = 0.6
! mpirun -np 1 ./main a b c

Possible duplicate of Passing IPython variables as arguments to bash commands — paradox
– paradox, Commented Mar 29, 2019 at 12:43

user10417531 · Accepted Answer · 2019-03-29 11:56:08Z

2

you need to type it like this

a = 10
b = 0.2
c = 0.6
! mpirun -np 1 ./main {a} {b} {c}

answered Mar 29, 2019 at 11:56

user10417531

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Comments

Wolf · Accepted Answer · 2019-03-29 11:57:23Z

2

It looks like (from this document) you can wrap your Python variables in curly braces or else prefix them with the $ to get the to expand for the shell. E.g., ! mpirun -np 1 ./main {a} {b} {c}

answered Mar 29, 2019 at 11:57

Wolf

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Comments

paradox · Accepted Answer · 2019-03-29 12:39:22Z

1

! mpirun -np 1 ./main {a} {b} {c}

! mpirun -np 1 ./main $a $b $c

answered Mar 29, 2019 at 12:39

paradox

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