Python初學筆記

工作需要，要接觸python的程式，學習一下~

使用的3.2版本~話說比2.5變化還真多~print都變了~

總體感覺，py比較perl來說，特點還是非常之強烈的~

1、py可以自動字串複製：

>>> x='3'

>>> x*3
'333'
>>>

3、字串連線+號和join等string函式：

>>> x='z'

>>> y='zr'
>>> x=x+y
>>> print(x)
zzr>>> print(x,":",y)
zzr : zr

>>> aa =['1','2','3']

>>> split = '**'

>>> aftersplit=split.join(aa)
>>> print (aftersplit)
1**2**3

>>> x = 'zzrqwe'

>>> if 'qwe' in x:
print ('match') 
match
>>> if x.find('qwe') != -1:
print ('match') 
match
>>> print (x.find('qwe'))
3

>>> y = x.replace('q','qqq')

>>> y
'zzrqqqwe'

>>> a

['zrxrcrvr']
>>> a=y.split('r')
>>> a
['z', 'x', 'c', 'v', '']
>>> a.pop(4) #use index
''>>> a
['z', 'x', 'c', 'v']
>>> a.remove('v') #use value
>>> a
['z', 'x', 'c']
>>>

>>> name=type(x)

>>> print(name)
>>> type(none)
>>> id(none)
504026256

>>> x

6.333333333333333
>>> if 06、3.2版本的raw_input變化為input，不過active3.2整合的ide功能真的很強~
7、python的正規表示式，封裝為class就是給力~
'123.456.789'
>>> patt=re.compile(r"(\d+)\.(\d*)\.(\d+)")
>>> r=patt.match(age)
>>> print(r.group())
123.456.789
>>> print(r.lastindex)
3>>> print(r.group(1))
123>>>

>>> name='i am jason'

>>> print(name[2:4])
am

>>> for number in range(0,4,2):

...   print(number)
... 
02

10、__doc__和__name__用法，給力啊~~

11、del用法：

>>> x='123'

>>> print(x)
123>>> del x
>>> x
traceback (most recent call last):
file "", line 1, in x
nameerror: name 'x' is not defined

>>> print(list)

[1, 2, 3, 4, 1]
>>> list.remove(1)
>>> print(list)
[2, 3, 4, 1]
>>> list.reverse()
>>> print(list)
[1, 4, 3, 2]
>>> list.sort()
>>> print(list)
[1, 2, 3, 4]
>>> list.reverse()
>>> print(list)
[4, 3, 2, 1]
>>> for listitem in list:
print(listitem) 4
321>>>

>>> stringlist = ''

>>> for listitem in list:
stringlist = stringlist + str(listitem)
>>> print (stringlist)
4321
>>> stringlist = ''
>>> for listitem in list:
stringlist = stringlist , str(listitem)
>>> print (stringlist)
(((('', '4'), '3'), '2'), '1')
>>> stringlist[0]='1'
traceback (most recent call last):
file "", line 1, in stringlist[0]='1'
typeerror: 'tuple' object does not support item assignment

>>> print(stringlist[0][0])

(('', '4'), '3')
>>> print(stringlist[0][1])
2>>> print(stringlist[0][0][0])
('', '4')

>>> bb={}

>>> bb['gary'] = 
>>> bb
}>>> bb.values()
dict_values()
>>> bb.items()
dict_items([('gary', )])
>>> bb.get('gary')
>>> qq='qq'
>>> if qq in ab['gary']:
print(ab['gary']['qq']) 
23>>> bb['jason'] = >>> bb
, 'gary': }
>>> bb.items()
dict_items([('jason', ), ('gary', )])
>>> for item in sorted(bb.keys()):
for items in sorted(bb[item].keys()):
print (item,items,bb[item][items])
gary email ad
gary qq 23
jason email dd
jason qq 11
>>> bb.pop('gary')
>>> bb
}>>> for name in bb.keys():
for items,value in bb[name].items():
print (name ,"+++",items,"+++",value)
jason +++ qq +++ 11
jason +++ email +++ dd

17、檔案操作r,w,a：

string = '''bas 

(broadband access server/ broadband remote access server) 
end pppoe
'''f = open('bas.txt', 'w')
f.write(string)
f.close()
line = open('bas.txt').read()
print (line)

>>> aa = [1,2,3,4,5,6]

>>> g= lambda x : [num*2 for num in x if num % 2 ==0]
>>> g(aa)
[4, 8, 12]

感覺要寫大型專案而不是系統資料維護工作，python是首當其衝的選擇啊~

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