try

qiwsir · qiwsir · commit ff3092b77bd5 · 2016-08-25T16:25:47.000+08:00
diff --git a/newcodes/account.py b/newcodes/account.py
@@ -0,0 +1,25 @@
+#!/usr/bin/env python
+# coding=utf-8
+
+class Account(object):
+    def __init__(self, number):
+        self.number = number
+        self.balance = 0
+
+    def deposit(self, amount):
+        try:
+            assert amount > 0
+            self.balance += amount
+        except:
+            print("The money should be bigger than zero.")
+
+    def withdraw(self, amount):
+        assert amount > 0
+        if amount <= self.balance:
+            self.balance -= amount
+        else:
+            print("balance is not enough.")
+
+if __name__ == "__main__":
+    a = Account(1000)
+    a.deposit(-10)
diff --git a/newcodes/calculator.py b/newcodes/calculator.py
@@ -0,0 +1,18 @@
+#!/usr/bin/env python
+# coding=utf-8
+
+class Calculator(object):
+    is_raise = False
+    def calc(self, express):
+        try:
+            return eval(express)
+        except ZeroDivisionError:
+            if self.is_raise:
+                return "zero can not be division."
+            else:
+                raise
+
+if __name__ == "__main__":
+    c = Calculator()
+    c.is_raise = True
+    print(c.calc("8/0"))
diff --git a/newcodes/fibs_iter.py b/newcodes/fibs_iter.py
@@ -0,0 +1,22 @@
+#!/usr/bin/env python
+# coding=utf-8
+
+class Fibs:
+    def __init__(self, max):
+        self.max = max
+        self.a = 0
+        self.b = 1
+
+    def __iter__(self):
+        return self
+
+    def __next__(self):
+        fib = self.a
+        if fib > self.max:
+            raise StopIteration
+        self.a, self.b = self.b, self.a + self.b
+        return fib
+
+if __name__ == "__main__":
+    fibs = Fibs(5)
+    print(list(fibs))
diff --git a/newcodes/fibs_yield.py b/newcodes/fibs_yield.py
@@ -0,0 +1,17 @@
+#!/usr/bin/env python
+# coding=utf-8
+
+def fibs(max):
+    """
+    斐波那契数列的生成器
+    """
+    n, a, b = 0, 0, 1
+    while n < max:
+        yield b
+        a, b = b, a + b
+        n = n + 1
+
+if __name__ == "__main__":
+    f = fibs(10)
+    for i in f:
+        print(i, end=',')
diff --git a/newcodes/myrange.py b/newcodes/myrange.py
@@ -0,0 +1,22 @@
+#!/usr/bin/env python
+# coding=utf-8
+
+class MyRange:
+    def __init__(self, n):
+        self.i = 1
+        self.n = n
+
+    def __iter__(self):
+        return self
+
+    def __next__(self):
+        if self.i <= self.n:
+            i = self.i
+            self.i += 1
+            return i
+        else:
+            raise StopIteration()
+
+if __name__ == "__main__":
+    x = MyRange(7)
+    print([i for i in x])
diff --git a/newcodes/normal_rectangle.py b/newcodes/normal_rectangle.py
@@ -0,0 +1,28 @@
+#!/usr/bin/env python
+# coding=utf-8
+
+"""
+study __getattr__ and __setattr__
+"""
+
+class Rectangle:
+    """
+    the width and length of Rectangle
+    """
+    def __init__(self):
+        self.width = 0
+        self.length = 0
+
+    def setSize(self, size):
+        self.width, self.length = size
+    def getSize(self):
+        return self.width, self.length
+
+if __name__ == "__main__":
+    r = Rectangle()
+    r.width = 3
+    r.length = 4
+    print(r.getSize())
+    r.setSize( (30, 40) )
+    print(r.width)
+    print(r.length)
diff --git a/newcodes/special_rectangle.py b/newcodes/special_rectangle.py
@@ -0,0 +1,28 @@
+#!/usr/bin/env python
+# coding=utf-8
+
+class NewRectangle:
+    def __init__(self):
+        self.width = 0
+        self.length = 0
+
+    def __setattr__(self, name, value):
+        if name == "size":
+            self.width, self.length = value
+        else:
+            self.__dict__[name] = value
+
+    def __getattr__(self, name):
+        if name == "size":
+            return self.width, self.length
+        else:
+            raise AttributeError
+
+if __name__ == "__main__":
+    r = NewRectangle()
+    r.width = 3
+    r.length = 4
+    print(r.size)
+    r.size = 30, 40
+    print(r.width)
+    print(r.length)
diff --git a/newcodes/try_else.py b/newcodes/try_else.py
@@ -0,0 +1,14 @@
+#!/usr/bin/env python
+# coding=utf-8
+while 1:
+    try:
+        x = input("the first number:")
+        y = input("the second number:")
+
+        r = float(x)/float(y)
+        print(r)
+    except Exception as e:
+        print(e)
+        print("try again.")
+    else:
+        break
diff --git a/newcodes/try_except.py b/newcodes/try_except.py
@@ -0,0 +1,20 @@
+#!/usr/bin/env python
+# coding=utf-8
+
+while 1:
+    print("this is a division program.")
+    c = input("input 'c' continue, otherwise logout:")
+    if c == 'c':
+        a = input("first number:")
+        b = input("second number:")
+        try:
+            print(float(a)/float(b))
+            print("*************************")
+        except (ZeroDivisionError, ValueError) as e:
+            print(e)
+            print("*************************")
+        #except ValueError:
+        #    print("please input number.")
+        #    print("************************")
+    else:
+        break
