item在python里的意思
item在python里的意思是把字典中每对key和value组成一个元组。Python中通常使用for...in遍历字典，本文使用item()方法遍历字典。item()。item()方法把字典中每对key和value组成一个元组，并把这些元组放在列表中返回。DEMO代码如下:#!/usr/bin/envpython，#-*-coding:utf-8-*-，dict={"name":"zhangsan","age":"30","city":"shanghai","blog":"http://www.jb51.net"}
forkey,valueindict.items():print'key=',key,'value=',value。执行结果：可见key接收了字典的key，value接收了字典的value值。
绛旓細item鍦╬ython閲岀殑鎰忔濇槸鎶婂瓧鍏镐腑姣忓key鍜寁alue缁勬垚涓涓厓缁銆侾ython涓氬父浣跨敤for...in閬嶅巻瀛楀吀锛屾湰鏂囦娇鐢╥tem()鏂规硶閬嶅巻瀛楀吀銆俰tem()銆俰tem()鏂规硶鎶婂瓧鍏镐腑姣忓key鍜寁alue缁勬垚涓涓厓缁勶紝骞舵妸杩欎簺鍏冪粍鏀惧湪鍒楄〃涓繑鍥炪侱EMO浠ｇ爜濡備笅:#!/usr/bin/envpython锛#-*-coding:utf-8-*-锛宒ict={"name":"zh...
绛旓細鍦ㄤ綘鐨勪唬鐮佷腑锛屽畠灏辨槸涓涓彉閲忓悕鍛銆item鏈潵鏄竴绉嶆暟鎹紝鍙凯浠ｇ殑鏁版嵁绫诲瀷銆
绛旓細Item鏄嫳璇腑鐨勪竴涓瘝锛鍙互缈昏瘧鎴愨滅墿鍝佲濄佲滈」鐩濄佲滄潯娆锯濄佲滃搧鐩濈瓑銆傚湪涓嶅悓鐨勫満鏅腑锛孖tem鏈夌潃涓嶅悓鐨勬剰鎬濄傛瘮濡傚湪鍟嗕笟涓紝Item閫氬父鎸囩殑鏄煇绉嶅晢鍝佹垨鏈嶅姟锛屾瘮濡備綘鍘诲晢鍦轰拱涓滆タ锛屽晢鍝佺殑鍚嶇О灏变細琚爣鏄庝负Item銆傚湪宸ョ▼椤圭洰涓紝Item鎸囩殑鏄渶瑕佸畬鎴愮殑浠诲姟鎴栧叿浣撶殑宸ヤ綔鍐呭銆傚湪缃戠粶娓告垙涓紝Item鏄...
绛旓細鐩稿綋浜庨氳繃total杩涜绱姞item锛涚悊瑙: total + item 鐩稿姞鍚庨噸鏂拌祴鍊肩粰total
绛旓細nested_item鍙槸涓涓彉閲忓悕鑰屽凡锛屼綘涔熷彲浠ュ彇浠讳綍鍏朵粬鐨勫悕瀛楋紝涓嶈璺熷寰幆涓凡缁忕敤浜嗙殑鍙橀噺閲嶅悕灏卞彲浠 nested鐨勫瓧闈鎰忔灏辨槸鈥滆宓屽鍦ㄥ唴鐨勨
绛旓細print [i for i, x in enumerate(your_list) if x == 'your_item']your_list涓哄緟鏌ist锛寉our_item涓哄叿浣撹鏌ョ殑鍏冪礌锛屾墦鍗板嚭涓涓寘鍚墍鏈夎鏌ュ厓绱犱笅鏍囩殑鍒楄〃銆傘python鍒楄〃銆1銆佸彲浠ュ厛鍒涘缓涓涓┖鍒楄〃锛屽彲浠ヤ娇鐢╰ype()锛屾煡鐪嬬被鍨嬨2銆乤ppend(鍏冪礌) 杩藉姞鍏冪礌銆俰nsert(index锛屽厓绱) 鍦ㄦ寚瀹氫綅缃彃鍏...
绛旓細Python涓list鏄鐢涓嬭竟鐨凜璇█鐨勭粨鏋勬潵琛ㄧず鐨勩 ob_item 鏄敤鏉ヤ繚瀛樺厓绱犵殑鎸囬拡鏁扮粍锛宎llocated鏄 ob_item 棰勫厛鍒嗛厤鐨勫唴瀛樻诲閲 璁╂垜浠潵鐪嬩笅褰撳垵濮嬪寲涓涓┖list鐨勬椂鍊欏彂鐢熶簡浠涔 L = []闈炲父閲嶈鐨勬槸鐭ラ亾list鐢宠鍐呭瓨绌洪棿鐨勫ぇ灏忥紙鍚庢枃鐢╝llocated浠ｆ浛锛夌殑澶у皬鍜宭ist瀹為檯瀛樺偍鍏冪礌鎵鍗犵┖闂寸殑澶у皬( ob_size...
绛旓細鍩烘湰鍙ュ瀷濡備笅锛氫笅闈㈢殑浠ｇ爜鐨勬剰鎬鏄浜庡垪琛╗2,3,4]涓殑姣忎竴涓厓绱狅紝杈撳嚭鍏冪礌銆俻rint鍑芥暟榛樿鍦ㄦ瘡涓涓緭鍑哄悗闈㈡坊鍔犱簡涓涓崲琛岀锛屾墍浠ョ湅璧锋潵杈撳嚭鐨勫唴瀹规槸涓琛屼竴琛岀殑銆傝繖閲屾彃鍏ヤ竴鐐瑰埆鐨勫唴瀹癸紝鏂扮増鐨python鐨print鍑芥暟鏈夋墍鍙樺寲锛屼互鍓嶆垜浠娇鐢ㄩ楀彿print(item,),娉ㄦ剰item鍚庨潰鐨勯楀彿锛岃繖鏍峰彲浠ヤ笉璁﹑rint杈撳嚭鎹㈣...
绛旓細python 鍒涘缓涓涓厓缁 coordinates = (4, 5)灏濊瘯淇敼鍏冪粍锛堣繖浼氬紩鍙戦敊璇級coordinates[0] = 3 # TypeError: 'tuple' object does not support item assignment 璁块棶鍏冪粍涓殑鍏冪礌 print(coordinates[1]) # 杈撳嚭 5 3. 瀛楀吀锛圖ictionary锛夊瓧鍏告槸涓绉嶆棤搴忕殑閿煎闆嗗悎銆傚瓧鍏镐腑鐨勬瘡涓厓绱犻兘鏈変竴涓敮涓...
绛旓細List list鏄竴绉嶅鐞嗘湁搴忛」鐩泦鐨勬暟鎹粨鏋勶紝涔熷氨鏄锛屾偍鍙互鍦ㄤ竴涓垪琛ㄤ腑瀛樺偍涓绯诲垪椤圭洰銆傚垪琛涓殑椤圭洰搴旇鐢鏂规嫭鍙锋嫭璧锋潵锛岃繖鏍python灏辩煡閬撴偍鍦ㄦ寚绀轰竴涓垪琛ㄣ傚垱寤哄垪琛ㄥ悗锛屾偍鍙互娣诲姞銆佸垹闄ゆ垨鎼滅储鍒楄〃涓殑椤圭洰銆傜敱浜庡彲浠ユ坊鍔犳垨鍒犻櫎椤圭洰锛屾墍浠ユ垜浠鍒楄〃鏄彲鍙樻暟鎹被鍨嬶紝涔熷氨鏄锛岃繖绉嶇被鍨嬫槸鍙互鏀瑰彉鐨...
