Added functions.py

Author: learnp

21_iterators.py

@@ -0,0 +1,24 @@
+class RemoteControl():
+    def __init__(self):
+        self.channels = ["HBO","cnn","abc","espn"]
+        self.index = -1
+
+    def __iter__(self):
+        return self
+
+    def __next__(self):
+        self.index += 1
+        if self.index == len(self.channels):
+            raise StopIteration
+
+        return self.channels[self.index]
+
+r = RemoteControl()
+itr=iter(r)
+print(next(itr))
+print(next(itr))
+print(next(itr))
+print(next(itr))
+print(next(itr))
+
+

22_Generators.py

@@ -0,0 +1,10 @@
+def fib():
+    a, b = 0, 1
+    while True:
+        yield a
+        a, b = b, a+b
+
+for f in fib():
+    if f > 100:
+        break
+    print(f)

Debugging/conditional_breakpoint.py

@@ -0,0 +1,7 @@
+expense_list = [1230 , 2240 , 1500, 1678, 2020, 1580, 2240, 1500, 1245, 2300, 1246, 3400, 1580, 2240, 1500, 3240, 2240, 1500, 1245, 2300, 1246, 3400, 1580, 2240, 2467, 1245, 2300, 1246, 3400, 1580, 2240, 1500, 3240, 2240, 1500, 1245, 2300, 1246, 3400, 1580, 2240]
+total_expense = 0
+for expense in expense_list:
+    total_expense += expense
+
+print("total expense is: ", total_expense)
+    

argparse_tutorial.py

@@ -0,0 +1,27 @@
+import argparse
+
+if __name__ == "__main__":
+    parser = argparse.ArgumentParser()
+    parser.add_argument("--number1", help="first number")
+    parser.add_argument("--number2", help="second number")
+    parser.add_argument("--operation", help="operation", \
+                        choices=["add","subtract","multiply"])
+
+    args = parser.parse_args()
+
+    print(args.number1)
+    print(args.number2)
+    print(args.operation)
+
+    n1=int(args.number1)
+    n2=int(args.number2)
+    result = None
+    if args.operation == "add":
+        result=n1+n2
+    elif args.operation == "subtract":
+        result=n1-n2
+    elif args.operation == "multiply":
+        result=n1*n2
+
+
+    print("Result:",result)