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1.
Èç¹ûÄãÏÂÔصÄÊÇ×îаæµÄPython£¬¾Í»á·¢ÏÖËùÓÐÊéÖеÄHello WorldÀý×Ó½«²»ÔÙÕýÈ·¡£
Old:
print "Hello World!" #´òÓ¡×Ö·û´®
New:
print("Hello World!")
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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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http://blog.chinaunix.net/u1/59571/showart_1901962.html
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>>> a = {'1':'2'}
>>> b = {'3':'4'}
>>> a+b
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
TypeError: unsupported operand type(s) for +: 'dict' and 'dict'
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>>> a
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