Hi,
in Mathematica one can access the expression tree by the [[ ]] operator:
In[1]:= e = x*y + z
Out[1]= x y + z
In[2]:= e[[1]]
Out[2]= x y
In[3]:= e[[1, 1]]
Out[3]= x
Now one could change the *x* for a *q*:
In[4]:= e[[1, 1]] = q
Out[4]= q
In[5]:= e
Out[5]= q y + z
This works by replacing a part in the expression tree (position [[1, 1]]),
there is *no* pattern matching.
I was wondering, is there something like that in SymPy?
Maybe, instead of accessing *e.args[0].args[0]* (Mathematica's arrays are
1-starting), have some
*e.<some method>(0, 0)*and
*new_e = e.<some other method>(<new value>, 0, 0)*
Is there some easy way to avoid writing a traversal function?
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