python函数

  1 #encoding=utf-8
  2 
  3 '''
  4 用以下方法将参数设置成可选参数
  5 *num: 结合成tuple
  6 **num:结合成dict
  7 
  8 入参检查：(异常处理、条件判断）
  9     if isinstance(num1, int)  and isinstance(num2, string) 
 10 '''
 11 from test.test_socket import Urllib2FileobjectTest
 12 from inspect import ArgInfo
 13 def func_name(*num):
 14     print type(num)
 15     d = 0
 16     for i in num:
 17         d += i
 18     return d
 19 
 20 print  func_name(1,2,3,4,5,6,7,8)
 21 
 22 '''
 23 a = sorted(sen, key=lambda k:len(k))
 24 命令行:pydoc Urllib2
 25 
 26 Max_value = None;
 27 
 28 def  func2(a, b, c, d):
 29     """
 30     @a:说明参数a的类型
 31     """
 32 使用断言：asset
 33 print func2.__code__.co_filename
 34 print func2.__code__.co_varnames
 35 '''
 36 
 37 arg = 1
 38 def func3():
 39     arg = 4
 40 
 41 def func2():
 42      global arg  #指明该变量是全局变量
 43      arg = 3
 44  
 45 
 46 func3()
 47 print arg
 48 
 49 func2()
 50 print arg
 51 
 52 def func4(arg):
 53     arg[0] = 5
 54     return arg 
 55 
 56 tlist =[1, 2, 3]
 57 print func4(tlist)
 58 
 59 print tlist
 60 
 61 """
 62 assert isinstance(lst, list), 'Premeter is list only'
 63 lst = [s for s in os.listdir(path) if os.path.isdir('%s/%s'%(path, s))]
 64 列表推导式
 65 基本形式：[x for item in sequence <if (conditions)>], 这里x表示对item的操作，
 66 """
 67 
 68 def func5():
 69     lst2 = [1,2, 4, 6, 9, 0, 3]
 70     lst = [s for s in lst2 if s>5]
 71     print lst
 72     
 73 func5()
 74 
 75 '''
 76 lambda表达式：
 77     1、隐式return， 含有返回值
 78     2、lambda一般运用于执行很小的功能，不能在里面使用条件语句
 79 '''
 80 
 81 d = lambda x:x*2 if x>4 else ""
 82 g = lambda x:[(x, i) for i in xrange(0, 10)]
 83 
 84 print d(2)
 85 
 86 print g(1)
 87 
 88 
 89 '''
 90 filter
 91 
 92 '''
 93 t = [1, 2, 3, 4, 5]
 94 gg = filter(lambda x:x>3, t) 
 95 
 96 print gg
 97 
 98 """
 99 *kargs 元组
100 **kwargs 字典
101 """
102 
103 def  func9(*kargs, **kwargs):
104 #def  func9(a, *kargs, **kwargs):
105     return kargs
106 
107 print func9(2, 3, 5, 6, [1, 2, 3, 4], {1:2, 3:4})