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text = "Hello Python,Hello 2021."
letter = 0
digital = 0
other = 0
for i in text:
if i.isalpha():
letter += 1
elif i.isdigit():
digital += 1
else:
other += 1
print('åæ¯:{} æ°å:{} å
¶ä»:{}'.format(letter,digital,other))
è¾åºï¼
åæ¯:16 æ°å:4 å ¶ä»:4
ä¸é¢æ¯Pythonå
ç½®å
³äºå¤æå符串类åçæ¹æ³ä»ç»ï¼
str.isalnum()
å¦æå符串ä¸çææå符é½æ¯åæ¯ææ°åä¸è³å°æä¸ä¸ªå符ï¼åè¿å True ï¼ å¦åè¿å False ã å¦æ c.isalpha() ï¼ c.isdecimal() ï¼ c.isdigit() ï¼æ c.isnumeric() ä¹ä¸æä¸ä¸ªè¿å True ï¼åå符``c``æ¯åæ¯ææ°åã
str.isalpha()
å¦æå符串ä¸çææå符é½æ¯åæ¯ï¼å¹¶ä¸è³å°æä¸ä¸ªå符ï¼è¿å True ï¼å¦åè¿å False ãåæ¯å符æ¯æé£äºå¨ Unicode å符æ°æ®åºä¸å®ä¹ä¸º "Letter" çå符ï¼å³é£äºå ·æ "Lm"ã"Lt"ã"Lu"ã"Ll" æ "Lo" ä¹ä¸çéç¨ç±»å«å±æ§çå符ã 注æï¼è¿ä¸ Unicode æ åä¸å®ä¹ç"åæ¯"å±æ§ä¸åã
str.isascii()
å¦æå符串为空æå符串ä¸çææå符é½æ¯ ASCII ï¼è¿å True ï¼å¦åè¿å False ãASCII å符çç ç¹èå´æ¯ U+0000-U+007F ã
3.7 æ°çåè½.
str.isdecimal()
å¦æå符串ä¸çææå符é½æ¯åè¿å¶å符ä¸è¯¥å符串è³å°æä¸ä¸ªå符ï¼åè¿å True ï¼ å¦åè¿å False ãåè¿å¶å符æé£äºå¯ä»¥ç¨æ¥ç»æ10è¿å¶æ°åçå符ï¼ä¾å¦ U+0660 ï¼å³é¿æ伯åæ¯æ°å0 ã ä¸¥æ ¼å°è®²ï¼åè¿å¶åç¬¦æ¯ Unicode éç¨ç±»å« "Nd" ä¸çä¸ä¸ªå符ã
str.isdigit()
å¦æå符串ä¸çææå符é½æ¯æ°åï¼å¹¶ä¸è³å°æä¸ä¸ªå符ï¼è¿å True ï¼å¦åè¿å False ã æ°åå æ¬åè¿å¶å符åéè¦ç¹æ®å¤ççæ°åï¼å¦å ¼å®¹æ§ä¸æ æ°åãè¿å æ¬äºä¸è½ç¨æ¥ç»æ 10 è¿å¶æ°çæ°åï¼å¦ Kharosthi æ°ã ä¸¥æ ¼å°è®²ï¼æ°åæ¯æå±æ§å¼ä¸º Numeric_Type=Digit æ Numeric_Type=Decimal çå符ã
str.isidentifier()
å¦æå符串æ¯ææçæ è¯ç¬¦ï¼è¿å True ï¼ä¾æ®è¯è¨å®ä¹ï¼ æ è¯ç¬¦åå ³é®å èã
è°ç¨ keyword.iskeyword() æ¥æ£æµå符串 s æ¯å¦ä¸ºä¿çæ è¯ç¬¦ï¼ä¾å¦ def å classã