python - Save/load sympy lambdifed expressions -

Imagine the process of the following three steps:

• I'm a big and somewhat Complex expression (this process takes a lot of time) using sympy to create
• Use that expression in the lambda function by using sympy.lambdify (also slow) Is transformed.
• The function has been evaluated (fast)

Ideally, steps 1 and 2 are done only once, while step 3 evaluated multiple times Will go Unfortunately, the evaluation of step 3 spread over time (and different dragon sessions!)

I am looking for a way to save the "lambedefide" expression in the disk so that I can load them and I Unfortunately, pickle does not support lambda functions at one point after using it. In addition my lambda function is used.

I can definitely make and use it with a matching function, but it is fast disabling and error prone.

You can use "del", as told here

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and

Import the dill and set the variable 'recursive' to "true" value.

  import dill dill.settings ['recurse'] = True  

Let's say that f is your longitude function. You can dump it to disk using the following disk.

  dill.dump (f, open ("myfile", "w"))  

After this you can load the function from the following line . It can also be done with another dragon script.

  f_new = dill.load (open ("myfile"))