parados

    try:
        import matplotlib.pyplot as plt
    except Exception:
        plt = None
    
    class Visualizer:
    
        def animate_combined(
            # Stuff...
        ):
            # Stuff...
            try:
                import numpy as np
            except Exception:
                print("numpy is required for animation")
                return
            if plt is None:
                print("matplotlib not available - cannot animate")
                return