Ah ben en fait, non....
Voila la partie du code qui plante:
"def Plot(matrice_val_param) :
for t in matrice_val_param[0:] :
l = plot(float(t))
show()"

et la matrice en question :
['0.4', '0.41', '0.42', '0.43', '0.44', '0.45', '0.46', '0.47', '0.48', '0.49', '0.5', '0.51', '0.52', '0.53', '0.54', '0.55', '0.56', '0.57', '0.58', '0.59', '0.6', '0.61', '0.62', '0.63', '0.64', '0.65', '0.66', '0.67', '0.68', '0.69', '0.7', '0.71', '0.72', '0.73', '0.74', '0.75', '0.76', '0.77', '0.78', '0.79', '0.8', '0.81', '0.82', '0.83', '0.84', '0.85', '0.86', '0.87', '0.88', '0.89', '0.9', '0.91', '0.92', '0.93', '0.94', '0.95', '0.96', '0.97', '0.98', '0.99', '1', '1.01', '1.02', '1.03', '1.04', '1.05', '1.06', '1.07', '1.08', '1.09', '1.1', '1.11', '1.12', '1.13', '1.14', '1.15', '1.16', '1.17', '1.18', '1.19', '1.2']

Et enfin l'erreur : "AssertionError"
Une idée du problème?