關於字串的常見操作，請參見如下示例：
# @time : 2017/7/2 21:26
# @desc : string常見操作
string='hello,my name is hanmeimei'
'''find()
判斷子串是否在string中,若存在則返回子串在string中開始的索引值，否則返回-1
rfind()類似於find()函式，不過是從右邊開始查詢.
'''index1=string.find('llo')
print('index1=',index1)
#利用第二個，第三個引數指定判斷的範圍
index2=string.find('llo',0,10)
print('index2=',index2)
index3=string.find('llo',7,13)
print('index3=',index3)
print('= '*15)
'''count()
統計子串在string**現的次數
'''count1=string.count('m')
#利用第二個，第三個引數指定統計的範圍
count2=string.count('m',0,8)
print('count1=',count1)
print('count2=',count2)
print('= '*15)
'''replace()
把string中的str1替換成str2,如果count指定，則替換次數不超過count
'''replaceresult1=string.replace('mei','xx')
print('replaceresult1=',replaceresult1)
replaceresult2=string.replace('mei','xx',1)
print('replaceresult2=',replaceresult2)
print('string=',string)
print('= '*15)
'''split()
以str為分隔符切割string，可用maxsplit指定分割次數，即分隔成 maxsplit + 1 個子字串
'''fragment1=string.split(' ')
print('fragment1=',fragment1)
fragment2=string.split(' ',2)
print('fragment2=',fragment2)
print('= '*15)
'''startswith()
判斷string是否以str開頭
'''result1=string.startswith('hello')
result2=string.startswith('ello')
print('result1=',result1)
print('result2=',result2)
print('= '*15)
'''endswith()
判斷string是否以str結尾
'''result3=string.endswith('mei')
result4=string.endswith('***')
print('result3=',result3)
print('result4=',result4)
print('= '*15)
'''upper()
將string中字母變成大寫
'''upperstring=string.upper()
print('upperstring=',upperstring)
print('= '*15)
'''lower()
將string中字母變成小寫
'''lowerstring=upperstring.lower()
print('lowerstring=',lowerstring)
print('= '*15)
'''strip()
刪除字串兩端的空格。
類似的方法有lstrip()，rstrip()刪除字串左側，右側的空格
'''name=' hello all '
stripresult=name.strip()
print('stripresult=',stripresult)
print('= '*15)
'''partition()
把string以str分割成三部分,str前，str和str後
rpartition()類似於 partition()函式,不過是從右邊開始.
'''fragments=string.partition('llo')
print('fragments=',fragments)
print('= '*15)
'''splitlines()
按照行分隔即\n，返回乙個包含各行作為元素的列表
'''lines="good\nmorning\nsir"
resultlines=lines.splitlines()
print('resultlines=',resultlines)
print('= '*15)
'''isalpha()
判斷string中是否全為字母
'''isalpha=string.isalpha()
print('isalpha=',isalpha)
print('= '*15)
'''isdigit()
判斷string中是否全為數字
'''digitstring='123456789'
isdigit=digitstring.isdigit()
print('isdigit=',isdigit)
print('= '*15)
'''join()
str.join(sequence)將字串、元組、列表中的元素以指定的字元(str)連線生成乙個新的字串
'''str='_'
sequence=['hello','everyone','thanks']
joinresult=str.join(sequence)
print('joinresult=',joinresult)
print('= '*15)
index1= 2
index2= 2
index3= -1
= = = = = = = = = = = = = = =
count1= 4
count2= 1
= = = = = = = = = = = = = = =
replaceresult1= hello,my name is han***x
replaceresult2= hello,my name is hanxxmei
string= hello,my name is hanmeimei
= = = = = = = = = = = = = = =
fragment1= ['hello,my', 'name', 'is', 'hanmeimei']
fragment2= ['hello,my', 'name', 'is hanmeimei']
= = = = = = = = = = = = = = =
result1= true
result2= false
= = = = = = = = = = = = = = =
result3= true
result4= false
= = = = = = = = = = = = = = =
upperstring= hello,my name is hanmeimei
= = = = = = = = = = = = = = =
lowerstring= hello,my name is hanmeimei
= = = = = = = = = = = = = = =
stripresult= hello all
= = = = = = = = = = = = = = =
fragments= ('he', 'llo', ',my name is hanmeimei')
= = = = = = = = = = = = = = =
resultlines= ['good', 'morning', 'sir']
= = = = = = = = = = = = = = =
isalpha= false
= = = = = = = = = = = = = = =
isdigit= true
= = = = = = = = = = = = = = =
joinresult= hello_everyone_thanks
= = = = = = = = = = = = = = =
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