manim-gallery

class ChangeShape(Scene):

File transform.py

from manimlib.imports import *


class ChangeShape(Scene):
    def construct(self):
        circle = Circle()
        square = Square()

        self.play(Transform(circle, square))
        new_circle = Circle()
        self.play(Transform(circle, new_circle))

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Render this example

Install cairo, LaTeX and ffmpeg (LaTeX is optional) Install manimlib