python如何提取列表中的数字 python 提取字符串中的数字
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1\u3001\u6253\u5f00python\u8bed\u8a00\u547d\u4ee4\u7a97\u53e3\uff0c\u5b9a\u4e49\u4e00\u4e2a\u5217\u8868\u53d8\u91cfC\u5e76\u8fdb\u884c\u8d4b\u503c\u3002
2\u3001\u5229\u7528\u83b7\u53d6\u5217\u8868\u4e2d\u7684\u5e8f\u53f7\uff0c\u83b7\u53d6\u5bf9\u5e94\u7684\u5143\u7d20\uff0c\u7136\u540e\u5c06\u8fd9\u4e9b\u5143\u7d20\u62fc\u63a5\u6210\u4e00\u4e2a\u65b0\u7684\u5217\u8868\u3002
3\u3001\u8fd8\u53ef\u4ee5\u5b9a\u4e49\u4e00\u4e2a\u7a7a\u5217\u8868\uff0c\u7136\u540e\u4f7f\u7528for...in\u8bed\u53e5\u5faa\u73af\u751f\u6210\u5143\u7d20\uff0c\u88c5\u8f7d\u5230\u7a7a\u5217\u8868\u4e2d\u3002
4\u3001\u9664\u4e86\u4e0a\u8ff0\u4e24\u79cd\u65b9\u6cd5\u4e4b\u5916\uff0c\u8fd8\u53ef\u4ee5\u4f7f\u7528\u5207\u7247\u622a\u53d6\u7684\u529f\u80fd\u3002
5\u3001\u5207\u7247\u7684\u5e8f\u53f7\u9664\u4e86\u53ef\u4ee5\u662f\u4e24\u4e2a\u4e4b\u5916\uff0c\u8fd8\u53ef\u4ee5\u662f\u4e00\u4e2a\uff0c\u7f3a\u4e86\u7b2c\u4e00\u4e2a\u7559\u4e0b\u7b2c\u4e8c\u4e2a\u3002
6\u3001\u9664\u4e86\u8fd9\u4e4b\u5916\uff0c\u8fd8\u53ef\u4ee5\u662f\u4e00\u4e2a\u8d1f\u6570\uff0c\u8868\u793a\u4ece\u540e\u5230\u524d\u8fdb\u884c\u622a\u53d6\u3002
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## \u603b\u7ed3
## ^ \u5339\u914d\u5b57\u7b26\u4e32\u7684\u5f00\u59cb\u3002
## $ \u5339\u914d\u5b57\u7b26\u4e32\u7684\u7ed3\u5c3e\u3002
## \b \u5339\u914d\u4e00\u4e2a\u5355\u8bcd\u7684\u8fb9\u754c\u3002
## \d \u5339\u914d\u4efb\u610f\u6570\u5b57\u3002
## \D \u5339\u914d\u4efb\u610f\u975e\u6570\u5b57\u5b57\u7b26\u3002
## x? \u5339\u914d\u4e00\u4e2a\u53ef\u9009\u7684 x \u5b57\u7b26 (\u6362\u8a00\u4e4b\uff0c\u5b83\u5339\u914d 1 \u6b21\u6216\u8005 0 \u6b21 x \u5b57\u7b26)\u3002
## x* \u5339\u914d0\u6b21\u6216\u8005\u591a\u6b21 x \u5b57\u7b26\u3002
## x+ \u5339\u914d1\u6b21\u6216\u8005\u591a\u6b21 x \u5b57\u7b26\u3002
## x{n,m} \u5339\u914d x \u5b57\u7b26\uff0c\u81f3\u5c11 n \u6b21\uff0c\u81f3\u591a m \u6b21\u3002
## (a|b|c) \u8981\u4e48\u5339\u914d a\uff0c\u8981\u4e48\u5339\u914d b\uff0c\u8981\u4e48\u5339\u914d c\u3002## (x) \u4e00\u822c\u60c5\u51b5\u4e0b\u8868\u793a\u4e00\u4e2a\u8bb0\u5fc6\u7ec4 (remembered group)\u3002\u53ef\u4ee5\u5229\u7528 re.search \u51fd\u6570\u8fd4\u56de\u5bf9\u8c61\u7684 groups() \u51fd\u6570\u83b7\u53d6\u5b83\u7684\u503c\u3002
## \u6b63\u5219\u8868\u8fbe\u5f0f\u4e2d\u7684\u70b9\u53f7\u901a\u5e38\u610f\u5473\u7740 \u201c\u5339\u914d\u4efb\u610f\u5355\u5b57\u7b26\u201d
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a = [列表]
c = []
for x in a:
c.append(re.findall(r'\d+',x))
绛旓細1. 浠庣棁鐘鍒楄〃涓彁鍙鍏冪礌锛屼娇鐢╜item['symptons'] = li.xpath('div/p/a/text()').extract()`銆2. 閫氳繃閬嶅巻鍒楄〃锛屽皢姣忎釜鍏冪礌杩炴帴鎴愪竴涓瓧绗︿覆銆傚垵濮嬪寲瀛楃涓蹭负绌猴細`str=''`銆3. 鍦ㄥ惊鐜腑锛屽皢姣忎釜鍏冪礌`s`娣诲姞鍒板瓧绗︿覆`str`涓紝鍏冪礌涔嬮棿鐢ㄧ┖鏍煎垎闅斻4. 鏈鍚庯紝灏嗚繛鎺ュソ鐨勫瓧绗︿覆璧嬪肩粰`item...
绛旓細鏂规硶涓锛氫娇鐢ㄥ瓧鍏 1. 鍒涘缓涓涓┖瀛楀吀锛岀敤浜庡瓨鍌ㄥ厓绱犲強鍏跺嚭鐜扮殑娆℃暟銆2. 閬嶅巻鍒楄〃涓殑姣忎釜鍏冪礌銆3. 瀵逛簬姣忎釜鍏冪礌锛屾鏌ュ畠鏄惁宸插湪瀛楀吀涓細- 濡傛灉鏄紝灏嗗畠鐨勮鏁板鍔1銆- 濡傛灉涓嶆槸锛屽皢鍏舵坊鍔犲埌瀛楀吀涓紝骞惰缃鏁颁负1銆俙``python items = ["cc", "ct", "ct", "ac", "ac"]count = {} fo...
绛旓細绉婚櫎閲嶅鍏冪礌骞跺垱寤轰竴涓柊鐨勫垪琛 list2 = list(set(list1))list2.sort(reverse=False) # 灏嗗垪琛ㄧ敱灏忓埌澶ф帓搴 L2 = len(list2) # 鑾峰彇鎺掑簭鍚鍒楄〃list2鐨勯暱搴 鎵撳嵃鍘熷鍒楄〃 print('鍘熷鍒楄〃: ' + str(list1))閬嶅巻鎺掑簭鍚庣殑鍒楄〃锛岀粺璁℃瘡涓厓绱犵殑涓暟鍜屼綅缃 for m in range(L2):X = s...
绛旓細鍙互鍙傝冧笅闈㈢殑璧勬枡锛岃繃for 鐒跺悗浠嶢鐨勬暟缁鍙栧嚭鍒癮锛岀劧鍚庡彇鍑 import re a = [鍒楄〃]c = []for x in a:c.append(re.findall(r'\d+',x))
绛旓細python濡備綍灏鍒楄〃涓殑鏁版嵁鍐呭鎻愬彇鍑烘潵鏀惧埌涓涓瓧鍏搁噷鍦ㄥ睆骞曚笂鎸夊鍙蜂粠灏忓埌澶э紝1 鍒涘缓涓涓垪琛╨st鍜屼竴涓┖瀛楀吀dic,鍒楄〃褰撲腑鍔犲叆瑕佹眰涓殑鏁板瓧,瀛楀吀涓烘垜浠瓨鏀惧皢鏉ユ彁鍙栧埌鐨勬暟瀛楀仛鍑嗗,浠ｇ爜: lst =[10,20,30,40,50,60,70,80,90,99] dic ={} 2 鍒╃敤for寰幆鎻愬彇鍒楄〃lst褰撲腑鐨勬墍鏈夊厓绱,涔熷氨鏄偅浜...
绛旓細``` 杈撳嚭锛 ```python [1, 2, 3] ``` 鍦ㄨ繖涓ず渚嬩腑锛屾垜浠畾涔変簡涓涓悕涓篳my_list`鐨勫垪琛紝鍏朵腑鍖呭惈涓浜鏁板瓧銆傜劧鍚庯紝鎴戜滑浣跨敤鍒囩墖鎿嶄綔绗[0:3]`浠鍒楄〃涓彁鍙鍓嶄笁涓厓绱狅紝骞跺皢缁撴灉瀛樺偍鍦ㄥ悕涓篳first_three_elements`鐨勬柊鍒楄〃涓傛渶鍚庯紝鎴戜滑浣跨敤`print()`鍑芥暟灏嗙粨鏋滄墦鍗板埌鎺у埗鍙颁笂銆
绛旓細绗竴姝ワ細鎴戝垎鏋愬鏋滀粠涓鍫鏁伴噷闅忔満鎶藉彇鍑犱釜锛屽苟涓旀寜鍘熸潵鐨勯『搴忚緭鍑虹殑璇濓紝閭ｄ箞鑷冲皯瑕侀殢鏈轰袱娆℃墠鑳藉畬鎴愶紝绗竴娆￠殢鏈虹殑鍊兼槸纭畾闅忔満鍑犱釜鏁帮紝绗簩娆￠殢鏈烘槸纭畾闅忔満鐨勫笺傜浜屾锛氶殢鏈烘娊鍙栧嚑涓彲浠ョ敤random.randint(1,n锛夎繖涓嚱鏁版潵瀹炵幇锛岃繖涓猲浠ｈ〃鎵瑕侀殢鏈鍒楄〃鐨闀垮害銆傜涓夋锛氫笂涓姝ュ嚭鏉ヤ竴涓暟鍐冲畾姝ゆ...
绛旓細鍦Python缂栫▼涓紝鍒囩墖锛圫licing锛夋槸涓绉嶉珮鏁堢伒娲荤殑鎿嶄綔锛屽畠鑳戒粠鍒楄〃銆佸瓧绗︿覆鍜屽厓缁勭瓑搴忓垪绫诲瀷涓埅鍙栧瓙搴忓垪銆傞氳繃鎸囧畾璧峰浣嶇疆銆佺粨鏉熶綅缃拰姝ラ暱锛屽彲浠ョ伒娲诲湴鎻愬彇鎵闇鏁版嵁銆傛湰鏂囧皢璇︾粏璁茶ВPython鍒囩墖鐨勮娉曘佺敤娉曞拰鎶宸э紝鍔╀綘鏇撮珮鏁堝湴澶勭悊搴忓垪鏁版嵁銆傚垏鐗囩殑璇硶鍖呮嫭涓変釜鍙傛暟锛歴equence鏄緟鍒囩墖鐨勫簭鍒楀璞★紱start...
绛旓細1銆侀鍏堟墦寮JUPYTER NOTEBOOK锛屾柊寤轰竴涓┖鐧界殑PY鏂囨。銆2銆佸叾娆list = [1 锛 88锛 322锛 0锛 5] 杩欓噷鏈変竴涓鍒楄〃銆佷竴鍏辨湁5涓厓绱犱絾鏄渶瑕佺敤PYTHON璁＄畻鍑烘潵銆3銆佹渶鍚巐ist = [1 锛 88锛 322锛 0锛 5] sum = 0 for i in list: sum += 1 print(sum)銆
绛旓細瑕佷娇鐢 Python 浠庤緝澶鍒楄〃涓殑杈冨皬鍒楄〃涓煡鎵惧硷紝鍙互浣跨敤鍏抽敭瀛楀拰 for 寰幆銆備緥濡傦細in 鍦ㄦ浠ｇ爜涓紝for 寰幆灏嗛亶鍘 涓殑姣忎釜鍏冪礌锛屽苟涓旇璇彞灏嗘鏌ヨ鍏冪礌鏄惁涔熷湪 .濡傛灉鏄紝浠ｇ爜灏嗘墦鍗颁竴鏉℃秷鎭紝鎸囩ず宸叉壘鍒拌鍏冪礌銆俿mall_listifbig_list 杩愯姝や唬鐮佸悗锛岃緭鍑哄皢涓猴細姝ゆ柟娉曞彲鐢ㄤ簬蹇熸鏌ヨ緝澶у垪琛ㄤ腑...
