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"""Runner system for Pygame Zero.
By importing this module, the __main__ module is populated with the builtins
provided by Pygame Zero.
When pgzrun.go() is called, the __main__ module is run as a Pygame Zero
script (we enter the game loop, calling draw() and update() etc as defined in
__main__).
"""
import sys
import os
from pgzero.runner import prepare_mod, run_mod
mod = sys.modules['__main__']
if not getattr(sys, '_pgzrun', None):
if not getattr(mod, '__file__', None):
raise ImportError(
"You are running from an interactive interpreter.\n"
"'import pgzrun' only works when you are running a Python file."
)
prepare_mod(mod)
def go():
"""Run the __main__ module as a Pygame Zero script."""
if getattr(sys, '_pgzrun', None):
return
run_mod(mod)
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