texte_retour = []
with open('La_Karavano.txt', 'r') as txt:
    line = txt.readline()
    while (line != ""):
        texte_retour.append(line)
        line = txt.readline()

with open('new_Karavano.txt', 'w') as flow:
    longueur = len(texte_retour)
    num = 0
    while (num != longueur):
        flow.write(str(num + 1) + ";" + texte_retour[num])
        num += 1