Introduction to functions in python

巴扎黑
Release: 2017-08-05 16:08:58
Original
1251 people have browsed it

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=&#39; &#39;)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(&#39;refusenik user&#39;)70         print(complaint)71 72 if __name__ == &#39;__main__&#39;:73     x = 374     y = 475     n = 200076     print(x , &#39;的&#39; , y , &#39;次方(&#39; ,x ,&#39;**&#39; , y ,&#39;) = &#39; , myMethod(x,y))77     print(&#39;函数fib(n),当n =&#39; ,n)78     fib(n)79     print(getList([&#39;begin&#39;],-10))80     ask_ok(&#39;y&#39;)
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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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