将 xy 转换为 x*y? [英] Convert xy to x*y?

问题描述

我正在开发一个项目，其中用户以 xy 或 2x 或 2ab 的形式输入输入，但 sympy 无法明白了，我想把它们分别转换成 x * y, 2 * x, 2 * a * b

I am working on a project where user enters the input in the form of xy or 2x or 2ab but sympy is not able to understand that, i want to convert them into x * y, 2 * x, 2 * a * b respectively

推荐答案

sympy 实际上能够理解这一点.您需要使用 parsing 来帮助它:

sympy is actually able to understand that. You need to use parsing to help for it:

from sympy.parsing.sympy_parser import parse_expr
from sympy.parsing.sympy_parser import standard_transformations,\
implicit_multiplication_application
transformations = (standard_transformations +
    (implicit_multiplication_application,))
print(parse_expr("xy", transformations=transformations))

输出:xy

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