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Here is the source for an implementation of Steffensen's method in [[Python (programming language)|Python]].
:<syntaxhighlight lang="python">
from typing import Callable, Iterator
Func = Callable[[float], float, float]
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while True:
fx = f(x)
gx = g(f, x, fx)(x)▼
if abs(fx) <= tol:
break
else:
▲ gx = g(f, x, fx)(x)
x = x - fx / gx # Update to x_{n+1}
yield x # Yield value
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