Aggiunge esercizio 45

lab45.py

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+from os import strerror
+
+
+class StudentsDataException(Exception):
+    pass
+
+
+class BadLine(StudentsDataException):
+    def __init__(self, line_number, line):
+        message = "Riga " + str(line_number) + ": " + line.rstrip()
+        super().__init__(message)
+
+
+class FileEmpty(StudentsDataException):
+    def __init__(self):
+        super().__init__("il file esiste, ma e' vuoto")
+
+
+file_name = input("Inserisci il nome del file del Prof. Jekyll: ")
+students = {}
+
+try:
+    stream = open(file_name, "rt", encoding="utf-8")
+    lines = stream.readlines()
+    stream.close()
+
+    if len(lines) == 0:
+        raise FileEmpty()
+
+    for line_number, line in enumerate(lines, 1):
+        parts = line.split()
+
+        # Ogni riga deve avere esattamente: nome, cognome, punti.
+        if len(parts) != 3:
+            raise BadLine(line_number, line)
+
+        first_name = parts[0]
+        last_name = parts[1]
+
+        try:
+            # Accettiamo sia il punto sia la virgola come separatore decimale.
+            points = float(parts[2].replace(",", "."))
+        except ValueError:
+            raise BadLine(line_number, line)
+
+        student = first_name + " " + last_name
+
+        if student in students:
+            students[student] += points
+        else:
+            students[student] = points
+
+    if len(students) == 0:
+        raise FileEmpty()
+
+    for student in sorted(students.keys()):
+        print(student, students[student])
+
+except FileEmpty as e:
+    print("Errore:", e)
+except BadLine as e:
+    print("Errore nei dati di input:", e)
+except IOError as e:
+    print("Errore di I/O:", strerror(e.errno))

lab45.txt

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+John Smith 5
+Anna Bolena 4,5
+John Smith 2
+Anna Bolena 11
+Andrew Cox 1,5