python澶ф硶濂解€斺€旇楗板櫒銆佺敓鎴愬櫒銆佽凯浠ｅ櫒

Posted 2020-12-26

鏍囩锛?a href='http://www.mamicode.com/so/1/%e6%93%8d%e4%bd%9c' title='鎿嶄綔'>鎿嶄綔   杩斿洖   pytho   鍋滄   turn   搴忓垪   瀹炲弬   for   涓嶈兘   

1.瑁呴グ鍣?/h1>

  1. 涓嶈兘淇敼琚楗扮殑鍑芥暟鐨勬簮浠ｇ爜
  2. 涓嶈兘淇敼琚楗扮殑鍑芥暟鐨勮皟鐢ㄦ柟寮?/strong>

銆€銆€瀹炵幇瑁呴グ鍣ㄧ煡璇嗗偍澶囷細
銆€銆€銆€銆€1 鍑芥暟鍗?ldquo;鍙橀噺”
銆€銆€銆€銆€2 楂橀樁鍑芥暟
銆€銆€銆€銆€銆€    a:鎶婁竴涓嚱鏁板悕褰撳仛瀹炲弬浼犵粰鍙﹀涓€涓嚱鏁帮紙涓嶄慨鏀硅瑁呴グ鍑芥暟婧愪唬鐮侊級
  銆€銆€銆€銆€銆€  b:杩斿洖鍊间腑鍖呭惈鍑芥暟鍚嶏紙涓嶄慨鏀瑰嚱鏁扮殑璋冪敤鏂瑰紡锛?/strong>
銆€銆€銆€銆€3宓屽鍑芥暟

 

 

瑁呴グ鍣?鎯充簡寰堜箙杩囦袱澶╀唬鐮佸疄鐜?/strong>

锛?/strong>

 

鍒楄〃鐢熸垚寮忥細

a=[i if i<5 else i*i for i in a]

 

2.鐢熸垚鍣?/strong>

涓轰粈涔堜細鏈夎繖涓姛鑳斤紵

绛旓細鎴戜滑鍙互浣跨敤鍒楄〃鍌ㄥ瓨鏁版嵁锛屽彲褰撴垜浠殑鏁版嵁鐗瑰埆澶х殑鏃跺€欙紝寤虹珛浜嗗垪琛ㄦ槸寰堝崰鍐呭瓨锛岀敓鎴愬櫒浠栧彲浠ュ厛鍒涘缓鏁版嵁锛屼絾涓嶇敤锛屼綘闇€瑕佹椂鐢紝瑕佸嚑涓嬁鍑犱釜銆?/strong>

A绠€鍗曠殑鐢熸垚鍣?/strong>

a=( x for x in range(10))
next(a)
#鍐欎竴娆ext杈撳嚭涓€涓暟

next锛坅锛変細涓€鐩磋〃绀哄嚭a涓暟鎹洿鍒版病鏈夛紝涓斾笉鍙互鍥為€€銆?/p>

B.鐢ㄥ嚱鏁板啓鐨勭敓鎴愬櫒

yield

b鎶婂嚱鏁扮殑鎵ц杩囩▼鍐荤粨鍦ㄨ繖涓€姝ワ紝骞朵笖鎶奲鐨勫€硷紝杩斿洖缁欏闈㈢殑next锛堬級

next()鍞ら啋鍐荤粨鐨勫嚱鏁?/strong>

浠ｇ爜濡備笅锛?/strong>

def fib(max) :
    n,a,b=0,0,1
    while n<max:
        print("nice")
        yield b     
        a,b=b,a+b
        n+=1
     return 鈥?/span>done鈥?/span>
f=fib(15)
next(f)

浠ｇ爜鎵ц鍒皔ield b 杩欓噷鍋滀簡锛屽闈㈣皟鐢ㄤ竴娆ext锛坒锛夛紝缁х画璧般€傚啀娆¤皟鐢?浼氱户缁蛋锛岀洿鍒伴亣鍒颁笅涓€涓獃ield 閫氳繃next()鍞ら啋銆?/p>

杩愯鍒板畬绋嬪簭浼氭姤閿欙紝杩欐槸姝ｅ父鐨勩€?/p>

 

鍑芥暟鏈変簡YIELD涔嬪悗

1.鍑芥暟鍚嶅姞锛堬級灏卞緱鍒颁簡涓€涓敓鎴愬櫒

2.return鍦ㄧ敓鎴愬櫒閲岋紝浠ｈ〃鐢熸垚鍣ㄧ殑涓锛岀洿鎺ユ姤閿?/em>

 

2.鐢熸垚鍣╯end鏂规硶

A.鍞ら啋骞剁户缁墽琛?/strong>

B.鍙戦€佷竴涓俊鎭埌鐢熸垚鍣ㄥ唴閮?/strong>

浠ｇ爜濡備笅锛?/strong>

def range2(n) :
    count=0
    while count<n:
        print(count)
        count+=1
        sign=yield count
        if sign=鈥?/span>stop鈥?/span> :
            print(sign)
    return 1111
new_range=range2(3)
new_range.send("stop")

绋嬪簭璧板埌yield 杩斿洖娑堟伅鍒板闈㈠彲next 鍙帴鍙?send鐨勬秷鎭?浣滃嚭缁х画鎴栧仠姝㈢殑鎿嶄綔銆?/p>

 

3.杩唬鍣紙鍙惊鐜殑锛?/strong>

鍙互浣跨敤isinstance()鍒ゆ柇涓€涓璞℃槸鍚︽槸iterable瀵硅薄

iterable鍙凯浠ｇ被鍨?/strong>

isinstance(1.iterable)     
isinstance(鈥?/span>abc鈥?/span>,iterable)
   
#缁撴灉鏄細false true

杩唬鍣細鍙互琚玭ext()鍑芥暟璋冪敤骞朵笉鏂繑鍥炰笅涓€涓€煎緱瀵硅薄鎴愪负杩唬鍣?iterator

鎵€鏈夌敓鎴愬櫒涔熸槸杩唬鍣?/p>

涓轰粈涔堬細list,str dict鏄彲杩唬瀵硅薄锛屼絾鍗翠笉鏄凯浠ｅ櫒锛?/strong>

python涓紝iterator瀵硅薄琛ㄧず鐨勬槸涓€涓暟鎹祦锛宨terator瀵硅薄鍙互琚玭ext锛堬級鍑芥暟璋冪敤骞朵笉鏂繑鍥炰笅涓€涓暟鎹紝鐩村埌娌℃湁鏁版嵁鏃禨TOPITERATION閿欒锛屽彲浠ユ妸杩欎釜鏁版嵁娴侊紝鐪嬩綔鏄竴涓湁搴忓簭鍒楋紝浣嗘槸鎴戜滑鍗翠笉鍙互鎻愬墠鐭ラ亾搴忓垪鐨勯暱搴︼紝鍙兘涓嶆柇閫氳繃next锛堬級鍑芥暟瀹炵幇 鎸夐渶璁＄畻涓嬩竴涓暟鎹紝鎵€浠terator鐨勮绠楀紡鎯版€х殑锛屽彧鏈夊湪闇€瑕佽繑鍥?涓嬩竴涓暟鎹椂锛屼粬鎵嶄細璁＄畻锛岃€宒ict锛宭ist杩欎簺閮芥槸鏈夊ぇ灏忥紝闀垮害鐨勬墍浠ヤ笉鏄痠terator1