我使用sympy绘图后端。函数的图形被颠倒了，我不知道为什么。例如y=x^2是upsidedown，负y轴在上面。

from sympy import *
from sympy.parsing.sympy_parser import *
import spb
import sympy as sympy

def queryMatplotlibEq(qVal,labels, color, xBounds, yBounds):
    toShow = None
    if (labels == "true"):
        toShow = "center"

    qVal = qVal.replace('^', "**")

    x, y = symbols('x y', real=True)

    lhs, rhs = qVal.split('=')

    lhs = eval(lhs)
    rhs = eval(rhs)

    expr = lhs - rhs
    sols = solve(expr, y)

    plot = spb.plot(*sols, (x, xBounds[0], xBounds[1]), {"color": f"{color}", "markersize": "1"}, legend=False, aspect="equal", ylim=(
        yBounds[0], yBounds[1]), xlim=(xBounds[0], xBounds[1]), grid=toShow, show=False, adaptive=False, n=70000, is_point=True, axis_center=(0, 0))

    plot.show()
question = "y=x**2"
x, y = symbols("x y")
# [[-2.0, 2.3], [26.75, 31.0]]

xExtents = [-13, 13]
yExtents = [10, -30]

queryMatplotlibEq(question,"true","blue" ,xExtents,yExtents)

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