使用sympy庫中的plot_implicit函式繪制隱函式，隱函式中存在sign符號函式時，總是出現如下錯誤：
String fallback in sympify has been deprecated since SymPy 1.6. Use
sympify(str(obj)) or sympy.core.sympify.converter or obj._sympy_
instead. See https://github.com/sympy/sympy/issues/18066 for more
info.
deprecated_since_version='1.6'
D:\Anaconda3\envs\pytorch\lib\site-packages\sympy\plotting\plot_implicit.py:85: UserWarning: Adaptive meshing could not be applied to the expression. Using uniform meshing.
warnings.warn("Adaptive meshing could not be applied to the"
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