Класна робота №11 (№16.1, 16.2, 16.3, 16.4)

classwork11.py

@@ -0,0 +1,122 @@
+# Завдання 16.1
+class Iterator_1:
+
+    def __init__(self, n, multiplicity):
+        self.n = n 
+        self.k = 0
+        self.multiplicity = multiplicity
+
+    def __iter__(self):
+        return self
+
+    def __next__(self):
+        if self.k + 2 > self.n:
+            raise StopIteration
+        if self.multiplicity == 'even':
+            self.k += 2
+            return self.k
+        elif self.multiplicity == 'odd':
+            self.k += 1
+            if self.k % 2 != 0:
+                return self.k 
+            else:
+                self.k += 1
+                return self.k
+
+# Завдання 16.2            
+class Iterator_2:
+
+    def __init__(self, n, multiplicity):
+        self.n = n + 1
+        self.multiplicity = multiplicity
+
+    def __iter__(self):
+        return self
+
+    def __next__(self):
+        if self.n <= 2:
+            raise StopIteration
+        if self.multiplicity == 'even':
+            if self.n % 2 == 0:
+                self.n -= 2
+                return self.n 
+            else:
+                self.n -= 1
+                return self.n
+        elif self.multiplicity == 'odd':
+            if self.n % 2 != 0:
+                self.n -= 2
+                return self.n 
+            else:
+                self.n -= 1
+                return self.n
+
+# Завдання 16.3
+class Iterator_3:
+
+    def __init__(self, sequence, multiplicity):
+        self.sequence = sequence
+        self.multiplicity = multiplicity
+        self.index = 0
+
+    def __iter__(self):
+        return self
+
+    def __next__(self):
+        if self.index >= len(self.sequence):
+            raise StopIteration
+        if self.multiplicity == 'even':
+            element = self.sequence[self.index]
+            self.index += 2
+            return element
+        elif self.multiplicity == 'odd':
+            if self.index == 0:
+                self.index += 1
+            element = self.sequence[self.index]
+            self.index += 2
+            return element
+
+# Завдання 16.4
+class Iterator_4:
+
+    def __init__(self, sequence, multiplicity):
+        self.sequence = sequence
+        self.multiplicity = multiplicity
+        self.index = len(self.sequence) - 1
+
+    def __iter__(self):
+        return self
+
+    def __next__(self):
+        if self.index < 0:
+            raise StopIteration
+        if self.multiplicity == 'even':
+            if self.index % 2 != 0:
+                self.index -= 1
+            element = self.sequence[self.index]
+            self.index -= 2
+            return element
+        elif self.multiplicity == 'odd':
+            if self.index % 2 == 0:
+                self.index -= 1
+            element = self.sequence[self.index]
+            self.index -= 2
+            return element
+
+
+if __name__ == '__main__':
+    i_1 = Iterator_1(11, 'odd')
+    for x in i_1:
+        print(x)
+
+    i_2 = Iterator_2(11, 'even')
+    for x in i_2:
+        print(x)
+
+    i_3 = Iterator_3('abcdefgh', 'odd')
+    for x in i_3:
+        print(x)
+
+    i_4 = Iterator_4('abcdefgh', 'even')
+    for x in i_4:
+        print(x)