sympy expression to symbols

Question

I want to take an expression and split it by symbols. For example

rate = symbols('0')  
def add_rate(self, new_rate):  
    self.rate = self.rate + symbols(new_rate)

add_rate('-k\*A\*E')

So the whole thing is 0 + -k\\*A\\*E . After that I want to change k to 0.01 with method subs(symbol('k'), 0.01) to be 0 + -0.01\\*A\\*E and I can't cause whole expression -k\\*A\\*E is the symbol.

Maybe do you know how to change k to 0.01 ?

Answer 1

Solusion is using the sympy.parsing.sympy_parser opportunities.

from sympy.parsing.sympy_parser import *
rate = symbols('0')
def add_rate(self, new_rate):
self.rate = self.rate + parse_expr(new_rate.rate_string)