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Quick question, can anyone advise on an efficient way to convert complex arrays with complex part denoted '${I}$' in Mathematica to '$j$' (as used in Python) and curly brackets '{}' replaced with '[]' (as used in Python). I intend to then export the array as a csv. file and subsequently import it from Python.

Thanks for any assistance.

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    $\begingroup$ Convert the data to "String" and then use StringReplace. $\endgroup$
    – Daniel Huber
    Commented Jun 2, 2021 at 11:48

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Probably better than going through CSV is to use "PythonExpression" as an exporting format, e.g.

ExportString[{1+2I,3+4I},"PythonExpression"]
(*"[Complex(1,2), Complex(3,4)]"*)

EDIT: Python seems to expect complex numbers defined through complex(real,imag) and not Complex(real,imag), so the full workflow would be:

  • In Mathematica
Export["data.txt",{1+2I,3+4I},"PythonExpression"]
  • In Python
with open("data.txt","r") as datafile:
    data = eval(datafile.read().lower())

I haven't really tested the efficiency of this approach, but unless that's a concern this technique seems rather convenient.

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  • $\begingroup$ Thanks for your response. If you aren't using CSV, how do you access the array through Python? Is a special Python configuration required? $\endgroup$
    – John Doe
    Commented Jun 2, 2021 at 13:48
  • $\begingroup$ I'd expect eval to work on the python side, so no special configuration required... but somehow Mathematica is exporting "Complex(real,imag)" when Python expects "complex(real,imag)"... so I've edited my answer accordingly $\endgroup$
    – Fidel I. Schaposnik
    Commented Jun 2, 2021 at 14:07
  • $\begingroup$ Seems to work well on my side. Thanks, much appreciated. $\endgroup$
    – John Doe
    Commented Jun 2, 2021 at 14:24

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