python画图-ValueError: The TextBackend supports only expressions over a 1D range

想用python画一下函数图:

from sympy.parsing.sympy_parser import parse_expr
from sympy import plot_implicit

exc = lambda exper: plot_implicit(parse_expr(exper))
exc('x**2+(y-x**(2/3))**2-1') 

结果报错：ValueError: The TextBackend supports only expressions over a 1D range：

解决：（未安装matplotlib库）

pip install matplotlib