running mathics in pure python

[Arihant Parsoya]

Hi,

I have been using Mathics for quite some time now on my local server. I wanted to know if its possible to run mathics using pure python. I have seen that tests for Mathics are written in python. However, it will be quite useful if someone can give an example on how to debug this Mathics example in python:

    >> a+b+c /. c->d

    = a + b + d

    >> Replace[1 + x, {x -> 2}]

     = 1 + x

Thanks,

Arihant Parsoya

[Angus Griffith]

Hi Arihant,

I'm a bit confused by your question. Mathics is written is pure python (although you can compile the core with cython).

I think the confusion is coming from the difference between Replace and ReplaceAll (/. notation). Replace only applies to full expressions

In[1]:= Replace[x, {x->2}]
Out[1]= 2

In[2]:= Replace[x^2, {x->2}]
Out[2]= x ^ 2

ReplaceAll however applies at all levels:

In[3]:= ReplaceAll[1 + x, {x->2}]
Out[3]= 3

In[4]:= (1 + x) /. {x->2}
Out[4]= 3

Take a look at the matematica docs

• https://reference.wolfram.com/language/ref/Replace.html
• https://reference.wolfram.com/language/ref/ReplaceAll.html
  

Thanks,

Angus

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