tmp

courses/python_oop/abstract/iter_2.py

@@ -98,14 +98,31 @@ class FileReader:
 
 # ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~        
 
+class InfinityIterator:
+    
+    def __init__(self):
+        self.value = 0
+
+    def __iter__(self):
+        return self
+    
+    def __next__(self):
+        foo = self.value
+        self.value += 10
+        return foo
+
+def test_7():
+    # a = iter(InfinityIterator())
+    a = InfinityIterator()
+    print(next(a))
+    print(next(a))
+    print(next(a))
 
 
 def test_6():
     # reader = FileReader("lorem.txt")
     for lite in FileReader('lorem.txt'):
         print(lite)
-    
-
 
 def test_5():
     deck = Deck()
@@ -154,7 +171,8 @@ def main():
     # test_3()
     # test_4()
     # test_5()
-    test_6()
+    # test_6()
+    test_7()
 
 
 

courses/python_oop/abstract/iter_3.py

@@ -0,0 +1,74 @@
+
+class Iterator:
+
+    def __init__(self, text: str):
+        self.text = text.upper()
+        self.index = 0
+
+    def __iter__(self):
+        return self
+    
+    def __next__(self):
+        try:
+            result = self.text[self.index]
+        except IndexError:
+            raise StopIteration
+        self.index += 1
+        return result
+    
+# ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~        
+
+class SequenceIterator:
+
+    def __init__(self, data):
+        self.data = data
+        self.start_index = 0
+
+    def is_even(self, value):
+        return value%2 == 0
+
+    def __iter__(self):
+        return self
+    
+    def __next__(self):
+
+        if self.start_index >= len(self.data):
+            raise StopIteration
+
+        value = self.data[self.start_index]
+        
+        if self.is_even(len(self.data)) and self.start_index == len(self.data) - 2:
+            self.start_index = 1
+        elif self.is_even(len(self.data)) == False and self.start_index == len(self.data) - 1:
+            self.start_index = 1
+        else:
+            self.start_index += 2
+
+        return value
+
+
+def test_2():
+    container = SequenceIterator([1, 5, 4, 6, 43, True, 'hello'])
+    # container = SequenceIterator([1, 5, 4, 6, 43, True])
+    for i in container:
+        print(i)
+
+def test_1():
+    phrase = Iterator('Qwerty')
+    it_1 = iter(phrase)
+    it_2 = iter(phrase)
+    for i in it_1:
+        print(i)
+
+    for i in it_1:
+        print(i)
+
+    for i in it_2:
+        print(i)
+
+def main():
+    # test_1()
+    test_2()
+
+if __name__ == '__main__':
+    main()