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I have written a module which re-defines the print function. Is it possible to preimport it in order to redefine print() (with from [module] import print) to demonstrate or test it with a program, without having to modify this program ?

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  • No. Each process is separate. Commented Jul 14, 2020 at 19:49
  • Why should it have to be another process ? I wasn't thinking about making it another process. More about chaining like when to chain shell scripts with . script Commented Jul 14, 2020 at 19:51

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Eureka ! ;-)

One can import a module (here, redefine the print function) and then chain a new program (./PROGRAM) in the current environment by using the command :

from MODULE import print exec(open('./PROGRAM').read())

So (in linux) one can do it from command line (or script it) with :

python3 -c "from MODULE import print; exec(open('./PROGRAM').read())"

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