How to find the order of a ordinary/partial differential equation in sympy

[ShrohanMohapatra]

I am looking for an API/strategy to use one/some attributes of the relevant classes to find the order of an ODE/PDE using Sympy. Can anyone help, please?

[oscarbenjamin]

I've converted this to a discussion because issues should not be used for getting help.

[ShrohanMohapatra]

Sounds good .... so any suggestions on how to find the order of a ODE/PDE? Does the result of dsolve or pdsolve return any object which records the order?

[Gerodote]

I am looking for an API/strategy to use one/some attributes of the relevant classes to find the order of an ODE/PDE using Sympy. Can anyone help, please?

https://github.com/sympy/sympy/blob/fcf489588fa3ff1c06836719ece17b71e9839108/sympy/solvers/deutils.py#LL94C26-L94C26
if this doesn't help, check internal fucntions of collect functions:

sympy/sympy/simplify/radsimp.py

Line 235 in fcf4895

def parse_derivative(deriv):

for amazing experience use parse_term too:

sympy/sympy/simplify/radsimp.py

Line 262 in fcf4895

def parse_term(expr):

[oscarbenjamin]

There is a function called ode_order:

In [6]: ode_order(f(x).diff(x, 2) + f(x), f(x))
Out[6]: 2