python 3.0Óëpython 2.xµÄÇø±ð
ÕýÔÚÔĶÁ×îаæµÄ¡¶A byte of Python¡·¡£·¢ÏÖPython3.0ÔÚijЩµØ·½»¹ÊÇÓÐЩ¸Ä±äµÄ¡£×¼±¸ÂýÂýµÄÌå»á£¬ÓëÀϰ汾µÄ¡¶A byte of Python¡·×ö¶Ô±È£¬×îºóÔÙÈ¥²éÔĹٷ½ÍøÕ¾µÄÎĵµ¡£
1.
Èç¹ûÄãÏÂÔØµÄÊÇ×îаæµÄPython£¬¾Í»á·¢ÏÖËùÓÐÊéÖеÄHello WorldÀý×Ó½«²»ÔÙÕýÈ·¡£
Old:
print "Hello World!" #´òÓ¡×Ö·û´®
New:
print("Hello World!")
½«×Ö·û´®·Åµ½À¨ºÅÖÐprint³öÀ´£¬ÕâÖÖд·¨¶ÔÓÚÎÒÕâÖÖѧϰJava³öÉíµÄÈËÀ´Ëµ£¬ºÜÊÇÇ×Çа¡£º£©
2.
Old:
guess = int(raw_input('Enter an integer : ')) #¶ÁÈ¡¼üÅÌÊäÈëµÄ·½·¨
New:
guess = int(input('Enter an integer : '))
·½·¨Ãû±äµÃ¸ü¼ÓÈÝÒ׼ǣ¡
3.
¼ÓÈëÁËÒ»¸öеÄnonlocal statement£¬·Ç¾Ö²¿±äÁ¿£¬ËüµÄ·¶Î§½éÓÚglobalºÍlocalÖ®¼ä£¬Ö÷ÒªÓÃÓÚº¯ÊýǶÌ×£¬Ó÷¨ÈçÏ£º
#!/usr/bin/python
# Filename: func_nonlocal.py
def func_outer():
x = 2
print('x is', x)
def func_inner():
nonlocal x
x = 5
func_inner()
print('Changed local x to', x)
func_outer()
4.
VarArgs parameters£¬²»ÖªµÀÕâ¸ö·Òë³Éʲô±È½ÏÍ×µ±£¿ÏÈ¿´Àý×Ó£º
#!/usr/bin/python
# Filename: total.py
def total(initial=5, *numbers, **keywords):
count = initial
for number in numbers:
count += number
for key in keywords:
count += keywords[key]
return count
print(total(10, 1, 2, 3, vegetables=50, fruits=100))
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5.
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6.
ÔÚÊý¾Ý½á¹¹ÖУ¬¶àÁËÒ»ÖÖÀàÐÍ:set
SetÊÇÒ»ÖÖÎÞÐòµÄ¼òµ¥¶ÔÏóµÄ¼¯ºÏ£¬µ±ÎÒÃǹØÐÄÒ»¸ö¶ÔÏóÊÇ·ñÔÚÒ»¸ö¼¯ºÏÖдæÔÚ£¬¶øË³ÐòºÍ³öÏֵĴÎÊýÊÇ´ÎÒªµÄʱºò£¬¿ÉÒÔʹÓÃset¡£
7.
¹ØÓÚos.sep·½·¨£¬£¨setÊÇseparator£¬·Ö¸ô·ûµ
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4¡¢Tuples Ôª×é
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>>> f = open('data.txt','w')
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#!/usr/bin/env python
# -*-coding:UTF-8-*-#ÕâÒ»¾ä¸æËßpythonÓÃUTF-8±àÂë
#=========================================================================
#
# NAME: Python MySQL test
#
# AUTHOR: benyur
# DATE : 2004-12-28
#
# COMMENT: ÕâÊÇÒ»¸öpythonÁ¬½ÓmysqlµÄÀý×Ó
#
#================ ......