åç¬¦ä¸²æ¯ Python
ä¸å¸¸ç¨çæ°æ®ç±»åï¼æ们å¯ä»¥ä½¿ç¨å¼å·('æ")æ¥å建å符串ï¼å¯¹å符串è¿è¡ä½¿ç¨åæä½ï¼éè¦ç¨å°ç¹å®çå½æ°ï¼ä»¥ä¸æ¯å¸¸ç¨çPythonå符串æä½æ¹æ³ï¼
1. capitalize()
ä½ç¨ï¼capitalize() 主è¦æ¯ç¨æ¥å®ç°å符串é¦åæ¯å¤§åï¼å
¶ä»åæ¯å°åçåè½ã
å®ä¾ï¼
1
2str1 = "oldboy"
print(str1.capitalize())
è¾åºç»æï¼Oldboy
2. swapcase()
ä½ç¨ï¼swapcase() 主è¦æ¯ç¨æ¥å®ç°å符串大å°åå转ã
å®ä¾ï¼
1
2str1 = " Oldboy"
print(str1.swapcase())
è¾åºç»æï¼oLDBOY
3. title()
ä½ç¨ï¼title() 主è¦æ¯ç¨æ¥å®ç°å符串éåæ¯éå¼çé¨åï¼é¦åæ¯å¤§åï¼å
¶ä½åæ¯å°åã
å®ä¾ï¼
1
2str1 = "Old boy edu com"
print(str1.title())
è¾åºç»æï¼Old Boy Edu Com
4. upper()
ä½ç¨ï¼upper() 主è¦æ¯ç¨æ¥å®ç°å符串ææåæ¯å
¨é¨å¤§åã
å®ä¾ï¼
1
2str1 = "Oldboyedu"
print(str1.upper())
è¾åºç»æï¼OLDBOYEDU
5. lower()
ä½ç¨ï¼lower() 主è¦æ¯ç¨æ¥å®ç°å符串ææåæ¯å
¨é¨å°åã
å®ä¾ï¼
1
2str1 = "oLDBOYEDU"
print(str1.lower())
è¾åºç»æï¼oldboyedu
6. center()
ä½ç¨ï¼center() 主è¦æ¯ç¨æ¥å®ç°å符串å
容å±
ä¸ï¼å¡«å
ç©é»è®¤ä¸ºç©ºã
å®ä¾ï¼
1
2
3str1 = "Oldboyedu"
print(str1.center(15))
print(str1.center(15,"*"))
è¾åºç»æï¼
Oldboyedu
***Oldboyedu***
7. find()
ä½ç¨ï¼find() 主è¦ä½ç¨æ¯éè¿å
ç´ æ¾ç´¢å¼ï¼å¯ä»¥æ´ä½æ¾ï¼å¯ä»¥åçï¼æ¾ä¸å°åè¿å-1ã
å®ä¾ï¼
1
2
3str1 = "Oldboyedu"
print(str1.find('b'))
print(str1.find('A'))
è¾åºç»æï¼3 -1
8. index()
ä½ç¨ï¼index() 主è¦ä½ç¨æ¯éè¿å
ç´ æ¾ç´¢å¼ï¼å¯ä»¥æ´ä½æ¾ï¼å¯ä»¥åçï¼æ¾ä¸å°ä¼æ¥éã
å®ä¾ï¼
1
2
3str1 = " Oldboyedu "
print(str1.index("b"))
print(str1.index("A"))
è¾åºç»æï¼
0
Traceback (most recent call last):
File "", line 1, in
ValueError: substring not found
9. startswith(obj)
ä½ç¨ï¼startswith(obj) 主è¦ä½ç¨æ¯æ£æ¥å符串æ¯å¦æ¯ä»¥ obj å¼å¤´ï¼æ¯åè¿å Trueï¼å¦åè¿å Falseã
å®ä¾ï¼
1
2str1 = "Oldboyedu"
print(str1.startswith("O"))
è¾åºç»æï¼True
10. endswith(obj)
ä½ç¨ï¼endswith(obj) 主è¦ä½ç¨æ¯æ£æ¥å符串æ¯å¦æ¯ä»¥ obj å¼å¤´ï¼æ¯åè¿å Trueï¼å¦åè¿å Falseã
å®ä¾ï¼
1
2str1 = " Oldboyedu "
print(str1.endswith("edu"))
è¾åºç»æï¼True
11. strip()
ä½ç¨ï¼strip() 主è¦ä½ç¨æ¯å»é¤å符串åå两端çç©ºæ ¼æå
¶ä»å符ãæ¢è¡ç¬¦ãtabé®çã
å®ä¾ï¼
1
2
3
4str1 = "***Oldboy***"
print(str1.strip("*")) #å»é¤ä¸¤è¾¹ç*
print(str1.lstrip("*")) #å»é¤å·¦è¾¹ç*
print(str1.rstrip("*")) #å»é¤å³è¾¹ç*
è¾åºç»æï¼
Oldboy
Oldboy***
***Oldboy
12. replace(oldstr, newstr)
ä½ç¨ï¼replace(oldstr, newstr)主è¦ä½ç¨æ¯æ¿æ¢å符串ã
å®ä¾ï¼
1
2str1 = "Oldboyedu"
print(str1.replace("boy","man"))
è¾åºç»æï¼Oldmanedu
13. isalpha()
ä½ç¨ï¼isalpha()主è¦ä½ç¨æ¯è¦å¤æå符串æ¯å¦åªç±åæ¯ç»æï¼æ¯è¿åTureï¼å¦è¿åFalseã
å®ä¾ï¼
1
2
3
4str1 = "Oldboyedu"
str2 = âOld boy eduâ
print(str1.isalpha())
print(str2.isalpha())
è¾åºç»æï¼True False
14. isdigit()
ä½ç¨ï¼isdigit()主è¦ä½ç¨æ¯å¤æå符串æ¯å¦åªç±æ°åç»æï¼æ¯è¿åTureï¼å¦è¿åFalseã
å®ä¾ï¼
1
2
3
4str1 = "Oldboyedu"
str2 = â520â
print(str1.isdigit())
print(str2.isdigit())
è¾åºç»æï¼False True
15. format()
ä½ç¨ï¼format()主è¦ä½ç¨æ¯æ ¼å¼åå符串ã
æ¹å¼ä¸ï¼æä½ç½®ä¼ å
1
2str1 = 'æå«{},ä»å¹´{}å²'.format('oldboy',30)
print(str1)
è¾åºç»æï¼æå«oldboy,ä»å¹´30å²
æ¹å¼äºï¼æç´¢å¼ä¼ å
1
2str1 = 'æå«{0},ä»å¹´{1}å²'.format('oldboy',30)
print(str1)
è¾åºç»æï¼æå«oldboy,ä»å¹´30å²
æ¹å¼ä¸ï¼ækeyä¼ å
1
2str1 = 'æå«{name},ä»å¹´{age}å²'.format(age=30,name='oldboy')
print(str1)
è¾åºç»æï¼æå«oldboy,ä»å¹´30å²
16. count()
ä½ç¨ï¼count()主è¦ä½ç¨æ¯ç»è®¡å
ç´ å¨å符串åºç°ç次æ°ã
1
2str1 = "oldboyedu"
print(str1.count(âoâ)) #ç»è®¡å符oå¨å符串ä¸åºç°ç次æ°
æ°æ®ç»æï¼2
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