Manim is working in terminal but not in python shell

[Iamformanim]

I have succesfully installed everything as you instructed in your manim tutorial. Code is perfectly working in terminal but the same in code is not working in python shell. I am sharing the code and the error.

from big_ol_pile_of_manim_imports import *

class WriteStuff(Scene):
def construct(self):
example_text = TextMobject(
"This is a some text",
tex_to_color_map={"text": YELLOW}
)
example_tex = TexMobject(
"\sum_{k=1}^\infty {1 \over k^2} = {\pi^2 \over 6}",
)
group = VGroup(example_text, example_tex)
group.arrange_submobjects(DOWN)
group.set_width(FRAME_WIDTH - 2 * LARGE_BUFF)

    self.play(Write(example_text))
    self.play(Write(example_tex))
    self.wait()

Error is

Python 3.7.4 (v3.7.4:e09359112e, Jul 8 2019, 14:54:52)
[Clang 6.0 (clang-600.0.57)] on darwin
Type "help", "copyright", "credits" or "license()" for more information.

RESTART: /Users/richie/Desktop/Work/maniminstall/manim-master/manim_practice.py

Warning (from warnings module):
File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/pydub/utils.py", line 165
warn("Couldn't find ffmpeg or avconv - defaulting to ffmpeg, but may not work", RuntimeWarning)
RuntimeWarning: Couldn't find ffmpeg or avconv - defaulting to ffmpeg, but may not work

[Elteoremadebeethoven]

Manim was not designed to be used in the python shell, if you want to use a development environment you can use PyCharm, here how configure it.