Python--鍏充簬dict，,鏍囩锛?/p>鏈

Python--鍏充簬dict，,鏍囩锛?/p>鏈

鏍囩锛?/p>

鏈枃鍐呭鎽樺綍鑷厱璇剧綉銆奝ython 鍏ラ棬銆?/span>

1銆乨ict 鐗规€?/span>

dict鐢ㄨ姳鎷彿锝涳綕琛ㄧず锛岀劧鍚庢寜鐓?key: value, 鍐欏嚭鏉ュ嵆鍙€傛渶鍚庝竴涓?key: value 鐨勯€楀彿鍙互鐪佺暐銆?/span>

鈶犮€?span style="color: #ed1c24;">dict 鐨勬煡鎵鹃€熷害蹇?/strong>锛?strong>鏃犺dict鏈?0涓厓绱犺繕鏄?0涓囦釜鍏冪礌锛屾煡鎵鹃€熷害閮戒竴鏍?/strong>銆傝€宭ist鐨勬煡鎵鹃€熷害闅忕潃鍏冪礌澧炲姞鑰岄€愭笎涓嬮檷銆?/span>

dict鐨勭己鐐规槸鍗犵敤鍐呭瓨澶?/span>锛岃繕浼氭氮璐瑰緢澶氬唴瀹?/span>锛宭ist姝ｅソ鐩稿弽锛屽崰鐢ㄥ唴瀛樺皬锛屼絾鏄煡鎵鹃€熷害鎱?/span>

鈶°€?span style="color: #ed1c24;">dict 閫氳繃key 鏉ユ煡鎵?value ,鍥犳key 涓嶈兘閲嶅锛岃€寁alue鍙噸澶?/span>

鈶€?span style="color: #ed1c24;">dict鍌ㄥ瓨鐨?key:value"鏄棤搴忕殑锛屽嵆涓嶅彲鐢ㄧ储寮曞彿鍒囩墖绛夈€?/span>

Python鐨勫熀鏈被鍨嬪瀛楃涓层€佹暣鏁般€佹诞鐐规暟閮芥槸涓嶅彲鍙樼殑锛岄兘鍙互浣滀负 key銆備絾鏄痩ist鏄彲鍙樼殑锛屽氨涓嶈兘浣滀负 key銆?/span>

鐢?nbsp;dict琛ㄧず“鍚嶅瓧”-“鎴愮哗”鐨勬煡鎵捐〃濡備笅锛?/p>

 d = {

 鈥楢dam鈥? 95, #key : value

 鈥楲isa鈥? 85,

 鈥楤art鈥? 59

 }

鎴戜滑鎶?strong>鍚嶅瓧绉颁负key锛屽搴旂殑鎴愮哗绉颁负value锛?span style="color: #ed1c24;">dict灏辨槸閫氳繃key鏉ユ煡鎵?nbsp;value銆?/p>

2銆佽闂?dict

鍒涘缓涓€涓猟ict锛岀敤浜庤〃绀哄悕瀛楀拰鎴愮哗鐨勫搴斿叧绯伙細

 d = {

 鈥楢dam鈥? 95,

 鈥楲isa鈥? 85,

 鈥楤art鈥? 59

 }

浣跨敤d[key]鐨勫舰寮忔潵鏌ユ壘瀵瑰簲鐨?value锛岃繖鍜?list 寰堝儚锛屼笉鍚屼箣澶勬槸锛?strong>list 蹇呴』浣跨敤绱㈠紩杩斿洖瀵瑰簲鐨勫厓绱狅紝鑰宒ict浣跨敤key锛?/strong>

 23:30:12

娉ㄦ剰:閫氳繃 key 璁块棶 dict 鐨剉alue锛屽彧瑕?key 瀛樺湪锛宒ict灏辫繑鍥炲搴旂殑value銆傚鏋渒ey涓嶅瓨鍦紝浼氱洿鎺ユ姤閿欙細KeyError銆?/p>

瑕侀伩鍏?KeyError 鍙戠敓锛屾湁涓や釜鍔炴硶锛?/p>

涓€鏄厛鍒ゆ柇涓€涓?key 鏄惁瀛樺湪锛岀敤 in 鎿嶄綔绗︼細

 if 鈥楶aul鈥?in d:

 print d[鈥楶aul鈥榏

濡傛灉 鈥楶aul鈥?涓嶅瓨鍦紝if璇彞鍒ゆ柇涓篎alse锛岃嚜鐒朵笉浼氭墽琛?print d[鈥楶aul鈥榏 锛屼粠鑰岄伩鍏嶄簡閿欒銆?/p>

浜屾槸浣跨敤dict鏈韩鎻愪緵鐨勪竴涓?get 鏂规硶锛屽湪Key涓嶅瓨鍦ㄧ殑鏃跺€欙紝杩斿洖None锛?/strong>

 >>> print d.get(鈥楤art鈥?

 59

 >>> print d.get(鈥楶aul鈥?

 None

 3銆佹洿鏂?dict 

 
dict鏄彲鍙樼殑锛屽彲浠ラ殢鏃跺線dict涓坊鍔犳柊鐨?key-value銆傛瘮濡傚凡鏈塪ict锛?/span>

 d = {

 鈥楢dam鈥? 95,

 鈥楲isa鈥? 85,

 鈥楤art鈥? 59

 }

 瑕佹妸鏂板悓瀛︹€楶aul鈥樼殑鎴愮哗 72 鍔犺繘鍘伙紝鐢ㄨ祴鍊艰鍙ワ細

 >>> d[鈥楶aul鈥榏 = 72 

 鍐嶇湅鐪媎ict鐨勫唴瀹癸細

 >>> print d

 {鈥楲isa鈥? 85, 鈥楶aul鈥? 72, 鈥楢dam鈥? 95, 鈥楤art鈥? 59}

 濡傛灉 key 宸茬粡瀛樺湪锛屽垯璧嬪€间細鐢ㄦ柊鐨?value 鏇挎崲鎺夊師鏉ョ殑 value锛?/span>

 >>> d[鈥楤art鈥榏 = 60

 >>> print d

 {鈥楲isa鈥? 85, 鈥楶aul鈥? 72, 鈥楢dam鈥? 95, 鈥楤art鈥? 60}

 4銆侀亶鍘?杩唬 dict 

 鈪犮€乫or寰幆閬嶅巻锛氱敱浜巇ict涔熸槸涓€涓泦鍚堬紝鎵€浠ワ紝閬嶅巻dict鍜岄亶鍘唋ist绫讳技锛岄兘鍙互閫氳繃 for 寰幆瀹炵幇銆?

 >>> d = { 鈥楢dam鈥? 95, 鈥楲isa鈥? 85, 鈥楤art鈥? 59 }
>>> for key in d:
print key,鈥?鈥?d[key]

 Lisa - 85
Adam - 95
Bart - 59

鈪°€?span style="color: #ed1c24;">values() / itervalues() 鏂规硶锛氳繑鍥瀌ict 鐨剉alue鍊?/span> 

 values()鏂规硶锛氭妸 dict 杞崲鎴愪簡鍖呭惈 value 鐨刲ist 

 >>> d = { 鈥楢dam鈥? 95, 鈥楲isa鈥? 85, 鈥楤art鈥? 59 }
>>> print d.values()
[85, 95, 59]
>>> for v in d.values():
print v

 85
95
59

 鐢?strong>itervalues()鏂规硶鏇夸唬values()鏂规硶锛岃凯浠ｆ晥鏋滃畬鍏ㄤ竴鏍枫€傝€?nbsp;itervalues()鏂规硶涓嶄細杞崲锛屽畠浼氬湪杩唬杩囩▼涓緷娆′粠 dict 涓彇鍑?value锛屾墍浠?itervalues() 鏂规硶姣?values() 鏂规硶鑺傜渷浜嗙敓鎴?list 鎵€闇€鐨勫唴瀛樸€?

 鈪€?span style="color: #ed1c24;">items() / iteritems() 鏂规硶锛氳繑鍥瀌ict 鐨刱ey鍜寁alue 

 
dict 瀵硅薄鐨?nbsp;items()鏂规硶杩斿洖鐨勫€硷細

 >>> d = { 鈥楢dam鈥? 95, 鈥楲isa鈥? 85, 鈥楤art鈥? 59 } >>> print d.items() [(鈥楲isa鈥? 85), (鈥楢dam鈥? 95), (鈥楤art鈥? 59)]

 鍙互鐪嬪埌锛宨tems() 鏂规硶鎶奷ict瀵硅薄杞崲鎴愪簡鍖呭惈tuple鐨刲ist锛屽杩欎釜list杩涜杩唬锛屽彲浠ュ悓鏃惰幏寰梜ey鍜寁alue锛?/span>

 >>> for key, value in d.items(): ... print key, 鈥?鈥? value ... Lisa : 85 Adam : 95 Bart : 59

 鍜?values() 鏈変竴涓?itervalues() 绫讳技锛?nbsp;items()涔熸湁涓€涓搴旂殑iteritems()锛宨teritems() 涓嶆妸dict杞崲鎴恖ist锛岃€屾槸鍦ㄨ凯浠ｈ繃绋嬩腑涓嶆柇缁欏嚭 tuple锛屾墍浠ワ紝 iteritems() 涓嶅崰鐢ㄩ澶栫殑鍐呭瓨銆?/span>

Python--鍏充簬dict

鏍囩锛?/p>

鍘熸枃鍦板潃锛歨ttp://www.cnblogs.com/technologylife/p/5628582.html