class School:
def \_\_init\_\_(self):
self.student ={}
self.history = []
def student\_exists(self, name):
for grade in self.student:
return name in self.student[grade]
return False # dopo aver controllato tutte le liste, se non l´ho trovato non esite
def add\_student(self, name, grade):
if self.student\_exists(name):
self.history.append(False)
return # alternativa di break, ma salta fuori dalla funzione
if grade not in self.student:
self.student[grade] = []
self.student[grade].append(name)
self.history.append(True)
def roster(self):
ls\_st=[]
for grade in sorted(self.student.keys()):
ls\_st += sorted(self.student[grade])
return ls\_st
def grade(self, grade\_number):
if grade\_number in self.student:
return sorted(self.student[grade\_number])
else:
return []
def added(self):
return self.history
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