def analyse_frequence_lettre(texte,lettre): nbcar=len(texte) compteur=0.0 for k in range(nbcar): if texte[k]==lettre: compteur+=1 freq=round(compteur/nbcar,3) return(freq) def analyse_frequence_alphabet(texte): alphabet="abcdefghijklmnopqrstuvwxyz" frequences=[] for lettre in alphabet: frequences.append([lettre,analyse_frequence_lettre(texte,lettre)]) return(frequences)