Un exemple de mini applet: le pivot de Gauß

%display plain

import ipywidgets

M = random_matrix(QQ, 5, 7)

M

rowIndices = list(range(M.nrows()))

rowIndices

L1 = ipywidgets.Dropdown(description="L1", options=rowIndices)
L2 = ipywidgets.Dropdown(description="L2", options=rowIndices)

L1

L1.value

Lambda = ipywidgets.Text()
Lambda

Lambda.value

Echange = ipywidgets.Button(description="Echange"); Echange

Matrix = ipywidgets.Output()

Matrix

def update():
    Matrix.clear_output(wait=True)
    with Matrix:
        display(M)

update()

App = ipywidgets.VBox([L1, L2, Lambda, Echange, Matrix])

App

def echange(context):
    l1 = L1.value
    l2 = L2.value
    M[l1], M[l2] = M[l2], M[l1]
    update()
        

Echange.on_click(echange)