aggiunge esercizio 44

lab44.py

@@ -0,0 +1,36 @@
+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))