為什么80%的碼農(nóng)都做不了架構(gòu)師？>>> ??

a = "who aRe You?" c = a.lower()#全小寫 d = a.upper()#全大寫 e = a.title()#每個(gè)單詞的首字母大寫，其它小寫 f = a.capitalize()#將第一個(gè)字母大寫，其他字母小寫 #title和capitalize的區(qū)別在于單詞 print(c) print(d) print(e) print(f)

效果圖:

who are you? WHO ARE YOU? Who Are You? Who are you?

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對(duì)于一個(gè)字典info = { "ac":1, "ad":2, "af":3, "ag":4 } 判斷key的存在時(shí)候可以用

a = "ad" if a in info:print("存在")

info[a]代表的是ad對(duì)應(yīng)的value值2 對(duì)字典進(jìn)行循環(huán)遍歷時(shí)

info = {"ac":1,"ad":2,"af":3,"ag":4 } for i in info:print(i)#輸出結(jié)果為： ac ad af ag

想要分別取鍵值對(duì)時(shí)

info = {"ac":1,"ad":2,"af":3,"ag":4 } for i,j in info.items():print(i,j) #輸出結(jié)果為 ac 1 ad 2 af 3 ag 4

只取字典的鍵時(shí)

info = {"ac":1,"ad":2,"af":3,"ag":4 } for i in info.keys():print(i) #輸出結(jié)果為 ac ad af ag

只取字典的值的時(shí)候

info = {"ac":1,"ad":2,"af":3,"ag":4 } for i in info.values():print(i) #輸出結(jié)果為 1 2 3 4

轉(zhuǎn)載于:https://my.oschina.net/mypeng/blog/2052650

總結(jié)

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