Python library for construct arithmetic expression (including function calls), which can be serialized to/deserialized from json.
- Console game DUST 514 by CCP, on PlayStation, used for formula updating.
easy_install pyxp
or
pip install pyxp
from pyxp import val, from_json, context
# Expression variables could be assign to python variables to use later,
# or use them inline, see 'val.my_sum'.
double = val.double
add = val.add
a = val.a
b = val.b
exp = double(a + b) + add(a, b) - (val.my_sum(a, b) << 1)
# Serialize to string, so you could send it over network.
json_str = exp.to_json()
# Deserialization
exp_deserialized = from_json(json_str)# Functions and variables sharing the same namespace.
context_ = context(
a=10,
b=2,
double=lambda x: x * 2,
add=lambda x, y: x + y,
my_sum=lambda *args: sum(args),
)
actual = exp.calc(context_)
assert actual == 12
More examples Test Cases