Ò׽ؽØÍ¼Èí¼þ¡¢µ¥Îļþ¡¢Ãâ°²×°¡¢´¿ÂÌÉ«¡¢½ö160KB

Python ǶÌ׺¯Êý Óë ±äÁ¿×÷ÓÃÓò

a=1
print id(a)
a=2
print id(a)
a=a+1
print id(a) 
-------------------------------------------------------------------------------------------------------------------------
t=6
def tt():
    global t
    t=t+1
    print t
print t
tt()
½á¹ûΪ£º
6
7
-------------------------------------------------------------------------------------------------------------------------
t=6
def tt():
    t=t+1
    print t
print t
tt()
½á¹û£º³ö´í exceptions.UnboundLocalError: local variable 't' referenced before assignment    
-------------------------------------------------------------------------------------------------------------------------
def f1(n):
    m=n
    def f2(i):
            print m,i         
    return f2
a=f1(2)
b=f1(3)
a(1)
b(2)
½á¹û£º
2 1
3 2
-------------------------------------------------------------------------------------------------------------------------
m=999
def f1(n):
    m=n
    def f2(i):
        global m
        print m,i
    return f2
a=f1(2)
b=f1(3)
a(1)
b(2)
½á¹ûΪ£º
999 1
999 2


Ïà¹ØÎĵµ£º

Python¿âÏê½âÖ®ÍøÂç(2)

×òÌìÊÔÁËÏÂÓÃHTMLParserÀàÀ´½âÎöÍøÒ³£¬¿É·¢ÏÖ½á¹û²¢²»ÀíÏë¡£²»¹ÜÔõô˵£¬ÏÈдϹý³Ì£¬Ï£ÍûºóÀ´ÈËÄÜÔÚ´Ë»ù´¡ÉϽâ¾öÎÒËùÓöµ½µÄÎÊÌâ¡£
дÁË2Ì×½â¾ö·½°¸£¬µ±È»Õâ2Ì×Ö»ÄܶÔÌØ¶¨ÍøÕ¾ÓÐЧ¡£ÎÒÕâÀïÖ÷Ҫ˵Ã÷϶ÔBBCÖ÷Ò³www.bbc.co.ukºÍ¶ÔÍøÒ×www.163.comµÄ½âÎö¡£
¶ÔÓÚBBC£º
ÕâÌ×Òª¼òµ¥µÃ¶à£¬¿ÉÄÜÊǸÃÍøÒ³µÄ±àÂë±È½Ï±ê×¼°É
import ......

Python ιʶøÖªÐÂ

1. ´òÓ¡±äÁ¿ºÍ±äÁ¿×ÔÏÔ
>>> myString = 'Hello World!'
>>> print myString
Hello World!
>>> myString
'Hello World!'
ÒòΪ£º print Óï¾äµ÷ÓÃstr()º¯ÊýÏÔʾ¶ÔÏ󣬶ø½»»¥Ê½½âÊÍÆ÷Ôòµ÷ÓÃrepr()º¯ÊýÀ´ÏÔʾ¶ÔÏó
sys.stdout.write('hello')²»»áÔÚĩβ¼ÓÉÏ'\n'£¬¶øprint»á
2. ´òÓ¡Îļþ
hand ......

Python: ʹÓÃ×°ÊÎÆ÷¡°@¡±È¡µÃº¯ÊýÖ´ÐÐʱ¼ä

¡¡¡¡PythonÖпÉÒÔʹÓÃ×°ÊÎÆ÷¶Ôº¯Êý½øÐÐ×°ÊΣ¨»ò˵°ü×°£©£¬ÀûÓÃÕâ¸öÌØÐÔ£¬¿ÉÒԺܷ½±ã¡¢¼ò½àµØ½â¾öһЩÎÊÌ⣬±ÈÈç»ñµÃº¯ÊýÖ´ÐÐʱ¼äµÄÎÊÌâ¡£
¡¡¡¡Ê×ÏÈ£¬ÎÒÃǶ¨ÒåÒ»¸öº¯Êý£¬ÈçÏ£º
¡¡¡¡def exeTime(func):
def newFunc(*args, **args2):
t0 = time.time()
print "@%s, {%s} start" % (time.strftime("%X", time.local ......

PythonÄÚ½¨º¯ÊýÖ®——filter,map,reduce

     ÔÚ½²Êöfilter£¬mapºÍreduce֮ǰ£¬Ê×ÏȽéÉÜÒ»ÏÂÄäÃûº¯Êýlambda¡£
     lambdaµÄʹÓ÷½·¨ÈçÏ£ºlambda [arg1[,arg2,arg3,...,argn]] : expression
     ÀýÈ磺
     >>> add = lambda x,y : x + y
>>> add ......

Python±Ê¼Ç£¨8£©

PythonµÄÃæÏò¶ÔÏóÐÔÖÊ
ÀàºÍ¶ÔÏóÊÇÃæÏò¶ÔÏó±à³ÌµÄÁ½¸öÖ÷Òª·½Ãæ¡£Àà´´½¨Ò»¸öÐÂÀàÐÍ£¬¶ø¶ÔÏóÕâ¸öÀàµÄ ʵÀý ¡£ÕâÀàËÆÓÚÄãÓÐÒ»¸öintÀàÐ͵ıäÁ¿£¬Õâ´æ´¢ÕûÊýµÄ±äÁ¿ÊÇintÀàµÄʵÀý£¨¶ÔÏ󣩡£
 
ÐèҪעÒâµÄÊÇ£¬ÔÚPythonÖУ¬¼´±ãÊÇÕûÊýÒ²±»×÷Ϊ¶ÔÏó£¨ÊôÓÚintÀࣩ¡£ÕâºÍC++¡¢Java£¨1.5°æÖ®Ç°£©°ÑÕûÊý´¿´â×÷ΪÀàÐÍÊDz»Í¬µÄ¡£Í¨¹ ......
© 2009 ej38.com All Rights Reserved. ¹ØÓÚE½¡ÍøÁªÏµÎÒÃÇ | Õ¾µãµØÍ¼ | ¸ÓICP±¸09004571ºÅ