PythonExpression

Import and Export support PythonExpression.
There is no associated file extension for PythonExpression. To execute ".py" files, use ExternalEvaluate .
Python must be installed and configured on your system as described in Configure Python for ExternalEvaluate.

Background & Context

- Code representation format for the Python programming language.
- PythonExpression supports Python numbers, strings, lists, Booleans and dictionaries.
- Plain text format.
- Python was first released as a programming language in 1991.

General Import elements:
"Elements" list of elements and options available in this file

"Summary" summary of the file

"Rules" list of rules for all available elements
Details of elements...
"Data" the literal Python expression
ImportString uses the "Data" element by default.
The symbol Null is represented as the Python value "None".
Not all Python built-in types are supported. The supported Python types are:
tuple List an ordered sequence of values

dictionary Association an association of keys and values

int Integer arbitrary-sized integer

long Integer arbitrary-sized integer

float Real real-valued number

complex Complex a complex number

list List a sequence of values

boolean True |False Boolean values

string String a sequence of character values

None Null null value

open allclose all

Import a simple string:

Import a list:

Export to a string:

Import a dictionary as a Wolfram Language list:

Export an Association as a Python dictionary:

Import the result of evaluating external code in Python:

Confirm it is the same as using the "ReturnType" of "Expression" :

"PythonExpression" internally starts and stops a Python session every time ImportString is called, which takes a substantial amount of time:

When performance is a concern, manually manage a Python session using ExternalEvaluate :

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