本文实例讲述了python开发之函数定义方法。分享给大家供大家参考,具体如下:
下面是我做的几个用列:
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#python中的函数定义,使用和传参 def_str = '''\ 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 ''' print (def_str) #下面进行举例说明 def helloWorld(): print ( '输出:hello' ) if __name__ = = '__main__' : helloWorld() print ( '''\ ################################################ 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 ################################################ ''' ) #定义一个方法:x的y次方 def myMethod(x,y): return x * * y def fib(n): a , b = 0 , 1 while a < n: print ( 'a, end = ' ) a , b = b , a + b print () #获取一个新的数组 #@param oldList 原数组 #@param length 要添加的长度 def getList(oldList,length): if length > 0 : for i in range ( 0 ,length): oldList.append(i) return oldList else : return '你输入的长度小于0' def ask_ok(prompt, retries = 4 , complaint = 'Yes or no, please!' ): while True : ok = input (prompt) if ok in ( 'y' , 'ye' , 'yes' ): return True if ok in ( 'n' , 'no' , 'nop' , 'nope' ): return False retries = retries - 1 if retries < 0 : raise IOError( 'refusenik user' ) print (complaint) if __name__ = = '__main__' : x = 3 y = 4 n = 2000 print (x , '的' , y , '次方(' ,x , '**' , y , ') = ' , myMethod(x,y)) print ( '函数fib(n),当n =' ,n) fib(n) print (getList([ 'begin' ], - 10 )) ask_ok( 'y' ) |
运行效果如下:
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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 ################################################ 的 4 次方( 3 * * 4 ) = 81 函数fib(n),当n = 2000 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 >>> |
希望本文所述对大家Python程序设计有所帮助。