add function examples

michaelliao · michaelliao · commit 1aac93f32cdd · 2015-03-30T22:21:36.000+08:00
diff --git a/py3/function/call_func.py b/py3/function/call_func.py
@@ -0,0 +1,9 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+
+x = abs(100)
+y = abs(-20)
+print(x, y)
+print('max(1, 2, 3) =', max(1, 2, 3))
+print('min(1, 2, 3) =', min(1, 2, 3))
+print('sum([1, 2, 3]) =', sum([1, 2, 3]))
diff --git a/py3/function/def_func.py b/py3/function/def_func.py
@@ -0,0 +1,26 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+
+import math
+
+def my_abs(x):
+    if not isinstance(x, (int, float)):
+        raise TypeError('bad operand type')
+    if x >= 0:
+        return x
+    else:
+        return -x
+
+def move(x, y, step, angle=0):
+    nx = x + step * math.cos(angle)
+    ny = y - step * math.sin(angle)
+    return nx, ny
+
+n = my_abs(-20)
+print(n)
+
+x, y = move(100, 100, 60, math.pi / 6)
+print(x, y)
+
+# TypeError: bad operand type:
+my_abs('123')
diff --git a/py3/function/params.py b/py3/function/params.py
@@ -0,0 +1,9 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+
+def power(x, n=2):
+    return x ** n
+
+print('power(5) =', power(5))
+print('power(5, 2) =', power(5, 2))
+print('power(5, 4) =', power(5, 4))
diff --git a/py3/function/recur.py b/py3/function/recur.py
@@ -0,0 +1,24 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+
+# &#21033;&#29992;&#36882;&#24402;&#20989;&#25968;&#35745;&#31639;&#38454;&#20056;
+# N! = 1 * 2 * 3 * ... * N
+def fact(n):
+    if n == 1:
+        return 1
+    return n * fact(n-1)
+
+print('fact(1) =', fact(1))
+print('fact(5) =', fact(5))
+print('fact(10) =', fact(10))
+
+# &#21033;&#29992;&#36882;&#24402;&#20989;&#25968;&#31227;&#21160;&#27721;&#35834;&#22612;:
+def move(n, a, b, c):
+    if n == 1:
+        print('move', a, '-->', c)
+        return
+    move(n-1, a, c, b)
+    print('move', a, '-->', c)
+    move(n-1, b, a, c)
+
+move(4, 'A', 'B', 'C')
