Include(PyPrimeNumberGenerator)

In [1]: li = range(10)

In [2]: li
Out[2]: [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]

In [3]: li[6]
Out[3]: 6

In [4]: li[:6]
Out[4]: [0, 1, 2, 3, 4, 5]

In [5]: li[6:]
Out[5]: [6, 7, 8, 9]

In [6]: li[:-6]
Out[6]: [0, 1, 2, 3]

In [7]: li[-6:]
Out[7]: [4, 5, 6, 7, 8, 9]

In [8]: li[::3]
Out[8]: [0, 3, 6, 9]

In [9]: li[:6:3]
Out[9]: [0, 3]

In [10]: li[6::3]
Out[10]: [6, 9]

In [11]: li[3:9:3]
Out[11]: [3, 6]

In [12]: li[3:9]
Out[12]: [3, 4, 5, 6, 7, 8]

1.1.1.1. 乘法表

In [13]: for i in range(1,10,1): [ i*j for j in range(1,i) ]
   ....:
Out[13]: []
Out[13]: [2]
Out[13]: [3, 6]
Out[13]: [4, 8, 12]
Out[13]: [5, 10, 15, 20]
Out[13]: [6, 12, 18, 24, 30]
Out[13]: [7, 14, 21, 28, 35, 42]
Out[13]: [8, 16, 24, 32, 40, 48, 56]
Out[13]: [9, 18, 27, 36, 45, 54, 63, 72]

1.1.1.2. 单行素数生成器!

• 展示思路...

  In [154]: a=7
  In [156]: [d for d in range(2,a-1)]
  Out[156]: [2, 3, 4, 5]
  In [155]: [a%d for d in range(2,a-1)]
  Out[155]: [1, 1, 3, 2]
  
  In [162]: a=8
  In [163]: 0 not in [a%d for d in range(2,a-1)]
  Out[163]: False
  
  In [167]: N=10
  In [168]: [p for p in range(2,N) if  0 not in [p%d for d in range(2,p-1)]]
  Out[168]: [2, 3, 5, 7]

Include(PyPrimeNumberGenerator)

1.1.2. 语法组织

1.1.2.1. 参数

{{{工厂模式... In [174]: def doit(do,i,j):

• ....: done = "%s %s %s" % (i,do,j)
• ....: print "want do::",done
• ....: return eval(done)

In [125]: def myfun(*args):

{{{重载运算符+ In [119]: class nplus:

• ....: def init(self,init):

• ....: self.one = init
• ....: print "creat n plus obj"

• ....: def add(self,two):

• ....: return self.one*two

}}}

自省！！ In [89]: def repself(item):

• ...: print "ID :",id(item)
• ...: print "TYPE :",type(item)
• ...: print "VALUE :",repr(item)

• ...: if hasattr(item,"name"):print "NAME::",item.name

• ...: if hasattr(item,"class"):print "CLASS::",item.class.name

import traceback In [200]: def callme():

• ....: s = traceback.extract_stack()
• ....: print "i'd call by %s !" % s[-2][2]

In [201]: fun1() i'd call by fun1 !

MixIn: In [202]: class A:

• ....: def init(self):

• ....: self.name = "class A"
• ....: def do(self):
• ....: print self.name

In [203]: class B:

• ....: def init(self):

• ....: self.name = "class B"
• ....: def add(self,a,b):
• ....: return a+b

In [212]: A.bases +=(B,)

In [213]: A. A.doc A.init A.module A.add A.do

Pluin:::

def p2(self,*arg):print "in %s !!!! %s"%(self.name,arg) setattr(A,"plugin",p2)

对象序列化: In [234]: lis=[1,2,"as",[1,2],(2,3,3),{}] In [235]: pickle.dump(lis,open("lisA.dump","w"))

In [237]: li2 = pickle.load(open("lisA.dump")) In [238]: li2 Out[238]: [1, 2, 'as', [1, 2], (2, 3, 3), {}]

编译字节文件: def myfunc(alist):

• return len(alist)

the following command can be used to get the disassembly of myfunc(): import dis >>> dis.dis(myfunc)

• 2 0 LOAD_GLOBAL 0 (len)
  • 3 LOAD_FAST 0 (alist) 6 CALL_FUNCTION 1 9 RETURN_VALUE
  • 10 LOAD_CONST 0 (None) 13 RETURN_VALUE

函式编程 map(func, list, …) 相当于[func(l) for l in list] In [241]: map((lambda x:x*x),range(10)) Out[241]: [0, 1, 4, 9, 16, 25, 36, 49, 64, 81] In [254]: map((lambda x,y:x+y),range(0,10,1),range(10,0,-1)) Out[254]: [10, 10, 10, 10, 10, 10, 10, 10, 10, 10]

In [257]: a=range(1,10,2) In [258]: a Out[258]: [1, 3, 5, 7, 9]

In [259]: b=range(10,0,-2) In [260]: b Out[260]: [10, 8, 6, 4, 2]

In [264]: zip(a,b) Out[264]: [(1, 10), (3, 8), (5, 6), (7, 4), (9, 2)]

In [101]: [(lambda x,y : x+y)(i,j) for i,j in zip(a,b)] Out[101]: [11, 11, 11, 11, 11]

In [102]: ["%s-%s "%(i,j) for i,j in zip(a,b)] Out[102]: ['1-10 ', '3-8 ', '5-6 ', '7-4 ', '9-2 ']

1.1.3. 中蟒

2. 反馈

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