Introduction to functions in python
下面是我做的几个用列：
1 #python中的函数定义，使用和传参 2 def_str = '''\ 3 python中的函数以如下形式声明: 4 5 def 函数名称([参数1，参数2，参数3......]): 6 执行语句 7 8 如： 9 10 def helloWorld():11 print('hello')12 13 if __name__ == '_main__':14 helloWorld()15 16 输出：hello17 '''18 print(def_str)19 20 #下面进行举例说明21 22 def helloWorld():23 print('输出：hello')24 25 if __name__ == '__main__':26 helloWorld()27 28 print('''\29 ################################################30 31 函数可以带参数和返回值，参数将按从左到右的匹配，32 参数可设置默认值，当使用函数时没给相应的参数时，33 会按照默认值进行赋值34 35 ################################################36 ''')37 38 #定义一个方法：x的y次方39 def myMethod(x,y):40 return x**y41 42 def fib(n):43 a , b = 0 , 144 while a < n:45 print(a, end=' ')46 a , b = b , a + b47 print()48 49 #获取一个新的数组50 #@param oldList 原数组51 #@param length 要添加的长度52 def getList(oldList,length):53 if length > 0:54 for i in range(0,length):55 oldList.append(i)56 return oldList57 else:58 return '你输入的长度小于0'59 60 def ask_ok(prompt, retries=4, complaint='Yes or no, please!'):61 while True:62 ok = input(prompt)63 if ok in ('y', 'ye', 'yes'):64 return True65 if ok in ('n', 'no', 'nop', 'nope'):66 return False67 retries = retries - 168 if retries < 0:69 raise IOError('refusenik user')70 print(complaint)71 72 if __name__ == '__main__':73 x = 374 y = 475 n = 200076 print(x , '的' , y , '次方(' ,x ,'**' , y ,') = ' , myMethod(x,y))77 print('函数fib(n),当n =' ,n)78 fib(n)79 print(getList(['begin'],-10))80 ask_ok('y')运行效果：
Python 3.3.2 (v3.3.2:d047928ae3f6, May 16 2013, 00:03:43) [MSC v.1600 32 bit (Intel)] on win32
Type "copyright", "credits" or "license()" for more information.>>> ================================ RESTART ================================
>>>
python中的函数以如下形式声明: def 函数名称([参数1，参数2，参数3......]):
执行语句
如： def helloWorld(): print('hello') if __name__ == '_main__':
helloWorld()
输出：hello
输出：hello ################################################
函数可以带参数和返回值，参数将按从左到右的匹配，
参数可设置默认值，当使用函数时没给相应的参数时，
会按照默认值进行赋值 ################################################
3 的 4 次方( 3 ** 4 ) = 81函数fib(n),当n = 20000 1 1 2 3 5 8 13 21 34 55 89 144 233 377 610 987 1597 你输入的长度小于0
y输出：hello
Yes or no, please!
y
Yes or no, please!
y
Yes or no, please!
y
Yes or no, please!
y
Traceback (most recent call last):
File "E:/Python33/python_workspace/test_function.py", line 80, in <module>
ask_ok('y')
File "E:/Python33/python_workspace/test_function.py", line 69, in ask_ok raise IOError('refusenik user')
OSError: refusenik user>>>
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