aggiunge esercizio 48

lab43.py

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+from os import strerror
+
+file_name = "lab43.txt"
+
+# Il dizionario conterra' una coppia chiave/valore per ogni lettera trovata:
+# chiave = lettera, valore = quante volte appare nel file.
+letters = {}
+
+try:
+    stream = open(file_name, "rt", encoding="utf-8")
+
+    ch = stream.read(1)
+    while ch != "":
+
+        ch = ch.lower()
+
+        if "a" <= ch <= "z":
+            if ch in letters:
+                letters[ch] += 1
+            else:
+                letters[ch] = 1
+
+        ch = stream.read(1)
+
+    stream.close()
+
+    for letter in sorted(letters.keys()):
+        print(letter, "->", letters[letter])
+
+except IOError as e:
+    print("Errore di I/O:", strerror(e.errno))

lab43.txt

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+aBc

lab44.py

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+from os import strerror
+
+
+file_name = "lab43.txt"
+
+letters = {}
+
+try:
+
+    source = open(file_name, "rt", encoding="utf-8")
+
+    ch = source.read(1)
+    while ch != "":
+        ch = ch.lower()
+
+        if "a" <= ch <= "z":
+            if ch in letters:
+                letters[ch] += 1
+            else:
+                letters[ch] = 1
+
+        ch = source.read(1)
+
+    source.close()
+
+    target = open(file_name + ".hist", "wt", encoding="utf-8")
+
+    for letter, counter in sorted(letters.items(), key=lambda item: item[1], reverse=True):
+        target.write(letter + " -> " + str(counter) + "\n")
+
+    target.close()
+
+    print("Istogramma salvato in:", file_name + ".hist")
+
+except IOError as e:
+    print("Errore di I/O:", strerror(e.errno))

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

lab46.py

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+import os
+
+
+def find(path, dir):
+    if not os.path.isdir(path):
+        return
+
+    for name in os.listdir(path):
+        full_path = os.path.join(path, name)
+
+        if os.path.isdir(full_path):
+            if name == dir:
+                print(os.path.abspath(full_path))
+
+            find(full_path, dir)
+
+
+if __name__ == "__main__":
+    start_path = input("Percorso di partenza: ")
+    directory_name = input("Directory da cercare: ")
+
+    find(start_path, directory_name)

lab47.py

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+from datetime import datetime
+
+d = datetime(year=2020, month=11, day=4, hour=14, minute=53, second=0)
+
+# Direttive usate con strftime:
+# %Y  anno con 4 cifre       -> 2020
+# %y  anno con 2 cifre       -> 20
+# %m  mese numerico          -> 11
+# %B  nome mese completo     -> November
+# %b  nome mese abbreviato   -> Nov
+# %d  giorno del mese        -> 04
+# %H  ora formato 24h        -> 14
+# %M  minuti                 -> 53
+# %S  secondi                -> 00
+# %p  AM/PM                  -> PM
+# %a  giorno abbreviato      -> Wed
+# %A  giorno completo        -> Wednesday
+# %w  giorno settimana       -> 3
+# %j  giorno dell'anno       -> 309
+# %W  numero settimana       -> 44
+
+print(d.strftime("%Y/%m/%d %H:%M:%S"))
+print(d.strftime("%y/%B/%d %H:%M:%S %p"))
+print(d.strftime("%a, %Y %b %d"))
+print(d.strftime("%A, %Y %B %d"))
+print(d.strftime("Weekday: %w"))
+print(d.strftime("Day of the year: %j"))
+print(d.strftime("Week number of the year: %W"))

lab48.py

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+from calendar import Calendar
+
+class MyCalendar(Calendar):
+
+    def count_weekday_in_year(self, year, weekday):
+
+        count = 0
+
+        for month in range(1, 13):
+
+            month_calendar = self.monthdays2calendar(year, month)
+
+            for week in month_calendar:
+
+                for day_number, day_weekday in week:
+
+                    if day_number != 0 and day_weekday == weekday:
+                        count += 1
+
+        return count
+
+
+my_calendar = MyCalendar()
+
+
+result = my_calendar.count_weekday_in_year(2000, 6)
+
+
+print(result)