Python入門教程 字串 二

1.capitalize():把字串的第乙個字元大寫

>>> str1='today is monday!'

>>> print 'str.capitalize():',str1.capitalize()
str.capitalize(): today is monday!
>>>

>>> str1='today is monday!'

>>> print 'str1.center():',str1.center(40,'a')
str1.center(): aaaaaaaaaaaatoday is monday!aaaaaaaaaaaa
>>>

範圍內str出現的次數。

>>> str1='today is monday!'

>>> print 'str1.count():',str1.count(sub,4,20)
str1.count(): 1
>>> sub='y'
>>> print 'str1.count():',str1.count(sub,4,40)
str1.count(): 2
>>>

5.encode(encoding='utf-8'):以encoding指定的編碼格式編碼字串。

str1='today is monday!'

>>> str1=str1.encode('base64','strict')
>>> print "encoded string:"+str1
encoded string:dg9kyxkgaxmgbw9uzgf5iq==
>>> print "decoded string:"+str1.decode('base64','strict')
decoded string:today is monday!
>>>

>>> str1='today is monday!'

>>> suffix='!'
>>> print str1.endswith(suffix)
true
>>> print str1.endswith(suffix,3,30)
true
>>> print str1.endswith(suffix,3,10)
false
>>>

8.find(str,beg=0,end=len(string)):檢測str是否包含在string中，如果beg和end指定範圍，則在指定範圍內檢測。如果是返回開始的索引值，否則返回-1.

>>> str1='today is monday!'

>>> suffix='!'
>>> print str1.find(suffix)
15>>> print str1.find(suffix,40)
-1>>>

>>> str1='today is monday!'

>>> suffix='!'
>>> print str1.index(suffix,40)
traceback (most recent call last):
file "", line 1, in print str1.index(suffix,40)
valueerror: substring not found
>>> print str1.index(suffix)
15>>>

>>> str1='thisis2015'

>>> print str1.isalnum()
true
>>> str2='thisis 2015'
>>> print str2.isalnum()
false
>>>

>>> str1='thisis2015'

>>> print str1.isalpha()
false
>>> str3='thisisaexample'
>>> str3.isalpha()
true
>>>

>>> str4=u"this2015"

>>> print str4.isdecimal()
false
>>> str5=u"12345"
>>> print str5.isdecimal()
true
>>>

>>> str4=u"this2015"

>>> str5=u"12345"
>>> print str4.isdigit()
false
>>> print str5.isdigit()
true
>>>

>>> str4=u"this2015"

>>> str5=u"12345"
>>> print str4.islower()
true
>>> print str5.islower()
false
>>>

>>> >>> str6=""

>>> print str6.isspace()
false
>>> str7="  "
>>> print str7.isspace()
true
>>>

>>> str1="this is a string"

>>> str2="this is a string"
>>> print str1.istitle()
false
>>> print str2.istitle()
true
>>>

>>> str1="this is a string"

>>> str2="this is a string"
>>> print str2.isupper()
false
>>> str3="ths is a string"
>>> print str3.isupper()
true
>>>

Python入門教程 字串 一

我們可以使用引號來建立乙個字串 例如 str1 hello,world str2 hello,world str3 hello,world python 並不支援單個字元型別，單個字元也作為字串處理。str abcdef print str 0 str 0 print str 1 4 str 1 4...

Python 入門（二）Unicode字串

字串還有乙個編碼問題。因為計算機只能處理數字，如果要處理文字，就必須先把文字轉換為數字才能處理。最早的計算機在設計時採用8個位元 bit 作為乙個位元組 byte 所以，乙個位元組能表示的最大的整數就是255 二進位制11111111 十進位制255 0 255被用來表示大小寫英文本母 數字和一些符...

React入門教程（二）

react基礎總結 續 示例 commentbox react createclass hello,world i am a commentbox.reactdom render react createelement commentbox null document getelementbyid ...