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def fibonacci(n):
    x = 0
    y = 1
    for i in range(n):
        print x
        tmp = y
        y = x + y
        x = tmp


def fibonacci(n):
    x, y = 0, 1
    for i in range(n):
        print x
        x, y = y, x + y


# one more example
tmp_x = x + dx * t
tmp_y = y + dy * t
tmp_dx = influence(m, x, y, dx, dy, partial='x')
tmp_dy = influnence(m, x, y, dx, dy, partial='y')
x = tmp_x
y = tmp_y
dx = tmp_dx
dy = tmp_dy


x, y, dx, dy = (
    x + dx * t,
    y + dy * t,
    influence(m, x, y, dx, dy, partial='x'),
    influnence(m, x, y, dx, dy, partial='y'),
)