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“Ending Price” and create it again, in order to update it, because python isn’t excel. df[‘Increment ΔS’] = 0.000 for i in range(0,100): df[‘Increment ΔS’][i+1] = μ * Δt + σ * df[‘Random Variable, εt’][i+1] * np.sqrt(Δt) df.drop([‘Ending Price’],axis=1,inplace=True) df 7. Let’s create our new fifth