師奶兵團(tuán)
try語句是python里面的控制語句,與except,finally配合使用處理在程序運行中出現(xiàn)的異常情況。
try的工作原理是:當(dāng)開始一個try語句后,python就在當(dāng)前程序的上下文中作標(biāo)記,這樣當(dāng)異常出現(xiàn)時就可以回到這里,try子句先執(zhí)行,接下來會發(fā)生什么依賴于執(zhí)行時是否出現(xiàn)異常。
假如在讀一個文件的時候,希望在無論異常發(fā)生與否的情況下都關(guān)閉文件,該怎么做呢?這可以使用finally塊來完成。注意,在一個try塊下,可以同時使用except從句和finally塊。如果要同時使用它們的話,需要把一個嵌入另外一個。
擴展資料:
python的基礎(chǔ)語法
Python的設(shè)計目標(biāo)之一是讓代碼具備高度的可閱讀性。它設(shè)計時盡量使用其它語言經(jīng)常使用的標(biāo)點符號和英文單字,讓代碼看起來整潔美觀。
python的用法
Python可以以交互模式運行,比如主流操作系統(tǒng)Unix/Linux、Mac、Windows都可以直接在命令模式下直接運行Python交互環(huán)境。直接下達(dá)操作指令即可實現(xiàn)交互操作。
一個和其他大多數(shù)語言(如C)的區(qū)別就是,一個模塊的界限,完全是由每行的首字符在這一行的位置來決定的(而C語言是用一對花括號{}來明確的定出模塊的邊界的,與字符的位置毫無關(guān)系)。
參考資料來源:百度百科-Python
參考資料來源:python官網(wǎng)-try..finally
烏魚島
1、try的基本意思是“試用”“努力”,指為完成某工作或驗證某事實的目的而付出努力或作出嘗試,但不指冒險做某事。
2、try可作“考驗”“磨煉”解,指用令人感到痛苦的人或事對某人的精神和肉體施加壓力以測其忍耐力或自我控制力。
3、try還可作“審訊”“審理”解,指人的罪過與清白的證實過程,而非結(jié)論,也可表示“檢驗”事物的真?zhèn)?、價值、強度與效力等。
4、try既可用作及物動詞,也可用作不及物動詞。用作及物動詞時,可接名詞、代詞、動名詞、動詞不定式、wh-從句作賓語。
5、try可接同源賓語,其賓語在最高級形容詞后??墒÷?。
6、try無須用非人稱代詞代替前面的整個句子。
7、try偶爾可接由動詞不定式充當(dāng)賓語補足語的復(fù)合賓語。
8、try and to/- v 與try to- v 意思基本相同,但try and to/- v 比try to- v 更帶有迫切的意味,常用于口語,而try to- v 多用于書面語。try and to/- v 只能用于現(xiàn)在時、將來時、祈使句、過去時一般疑問句。
9、try用作名詞時意為“嘗試”,是可數(shù)名詞,后可接由at或for引起的介詞短語。
擴展資料
近義詞:
一、attempt 英 [ə'tempt] 美 [ə'tempt]
v. 企圖;嘗試
n. 企圖;試圖
例:I would be the last to attempt to answer the question.
我是最不可能去嘗試回答這個問題。
二、shot 英 [ʃɒt] 美 [ʃɑːt]
n. 注射;投籃;發(fā)射;拍攝;開槍;子彈
adj. (織物)閃色的;精疲力盡的;完了的
動詞shoot的過去式和過去分詞.
例:Eight-year-old Griffin Stevens made the shot of a lifetime this past weekend.
8歲的格里芬史蒂文斯在本周末創(chuàng)造了一次一生難忘的投籃。
換樂無窮
“try-catch-finally語句塊”用來捕獲并處理異常。
你可能會想,如果你寫程序的時候有意的去避免異常,那么“try-catch-finally語句塊”不就沒什么用了嗎?可是,你的程序不是給你自己使用的吧?如果你要求用戶輸入1個數(shù)字,而且你的程序也明確提示了用戶需要輸入的是數(shù)字,但用戶就是輸入了“英文字母”,那么,你的程序沒有“try-catch-finally語句塊”一定會直接崩潰的。而如果用了“try-catch-finally語句塊”,并將這個異常處理為“再次提醒用戶需要輸入的是數(shù)字,并再次允許用戶重新輸入”,那你的程序就不會半途掛掉。
【示例】
//用"try-catch"強制用戶必須輸入一個數(shù)字!import java.util.Scanner;public class Test2 { public static void main(String args[]) { double d = 0; boolean badInput = true; Scanner input; while(badInput) { System.out.println("請輸入1個數(shù)字:"); input = new Scanner(System.in); try { d=input.nextDouble(); } catch(Exception e) { System.out.println("您輸入的不是數(shù)字!"); continue; } badInput = false; } System.out.println("您輸入的是:" + d); }}
霜鐔劍
if else 是流程控制語句,try catch是異常處理語句。
1,if用來判斷表達(dá)式返回的是true還是false,例如
if(a==b){ System.out.println("yes");}else{ System.out.println("no");}不能使用try catch判斷。
2,try catch是用來捕獲異常的,這里的異常是指在程序運行時可能出現(xiàn)的異常,捕獲異常后try里的代碼將不再執(zhí)行,而是轉(zhuǎn)到catch里面執(zhí)行。如果沒有異常,則執(zhí)行try里的代碼,catch里面不用執(zhí)行。例如
String a = "12211a"; try { int b = Integer.parseInt(a); // 將字符串轉(zhuǎn)為數(shù)字,a里面有字母,轉(zhuǎn)換失敗,將會拋出異常。 System.out.println("is a number:"+b); } catch (Exception e) { System.out.println("not a number"); }
女仙
try { //可能會拋出異常的語句} catch(Exception e) { //對捕捉到的異常進(jìn)行處理} finally { //不管有沒有異常,都進(jìn)行的操作}
張音
Try to do sth----努力做某事。Try doing sth-----嘗試做某事。try a fall with 與...較量一番try back 重新回到try conclusions with 和...決勝負(fù)try for 爭取, 謀求, 申請try it on (對...)?;ㄕ衪ry on 試穿, 試驗try one's best 盡力try sth out 試驗, 考驗, 提煉try out for sth參加。。。的選拔try over 試演(戲劇等)try to 設(shè)法try up 校準(zhǔn), 為...最后加工try your hand at sth 初試身手try one's luck 碰運氣try sb 's patient 使不耐煩差不多就這些了可以參考下, 希望對你有幫助O(∩_∩)O~
張采
Put your make-up on 化好妝 Get your nails done 美好甲 Curl your hair 卷上頭發(fā) Run the extra mile 再跑一英里 Keep it slim so they like you 保持苗條他們才會喜歡你 Do they like you? 他們喜歡你嗎? Get your sexy on 秀出性感 Don't be shy, girl 女孩,不要害羞 Take it off 把靦腆收起 This is what you want, to belong, so they like you 這就是你想要的 Do you like you? 跟他們一樣,他們才會喜歡你 You don't have to try so hard 你喜歡你自己嗎? You don't have to 你不必如此勉強 give it all away 你不必放棄真我 You just have to get up, get up, get up, get up 你只需勇敢面對自己 You don't have to change a single thing 你無需做出任何改變 You don't have to try, try, try, try 你不必勉強 You don't have to try 你不必勉強 Get your shopping on, at the mall 去商場盡情購物 max your credit cards 把信用卡刷爆 You don't have to choose, buy it all 你不用選擇,想買的都買下 So they like you 這樣他們才會喜歡你 Do they like you? 他們喜歡你嗎? Wait a second, 等等 Why, should you care, what they think of you 你為何要在意別人怎么看你 When you're all alone, by yourself, 當(dāng)你獨處時, do you like you? 你喜歡你自己嗎? Do you like you? 你喜歡你自己嗎? You don't have to try so hard 你不必如此勉強 You don't have to, give it all away 你不必放棄自我 You just have to get up, get up, get up, get up 你只需勇敢面對自己 You don't have to change a single thing 你無需做出任何改變 You don't have to try so hard 你不必勉強 You don't have to bend until you break 你不必勉強 You just have to get up, get up, get up, get up 你只需勇敢面對自己 You don't have to change a single thing 你無需做出任何改變 You don't have to try, try, try, try 你不必勉強 You don't have to try 你不必勉強 Take your make-up off 卸去妝容 Let your hair down 散開頭發(fā) Take a breath 吸一口氣 Look into the mirror, at yourself 看看鏡中的自己 Don't you like you? 你喜歡你自己嗎? Cause I like you 因為我喜歡這樣的你
祁連山
C語言里try是一個語句或函數(shù)。其作用是是拋出錯誤用。 將有可能產(chǎn)生錯誤的語句括在一起,放入try語句塊。如果在try語句塊中發(fā)生異常,F(xiàn)lashPlayer會創(chuàng)建一個錯誤對象,并將該Error對象派發(fā)至第一個可用的catch塊。catch語句塊提供對錯誤的處理。如果沒有try語句,或者try語句沒有出現(xiàn)錯誤,則catch語句不會被引發(fā)。如果在try語句塊的其中某個語句中檢測到錯誤,則會執(zhí)行附加到該try語句的catch語句。catch語句可以并列使用,即在一個try語句塊之后,存在多個catch語句塊,以處理不同的錯誤對象?! ry語句是:try { do something } catch(some error) { do something }
聚奎劍
Oooh哦~~·Oooh哦~~·Put your make up on 把你的化妝Get your nails done讓你的指甲Curl your hair卷曲的頭發(fā)Run the extra mile多跑一英里Keep it slim so they like you, do they like you?保持苗條,所以他們喜歡你,他們喜歡你嗎?Get your sexy on讓你的性感Don't be shy, girl不要害羞,女孩Take it off把它關(guān)掉This is what you want, to belong, so they like you這是你想要的,屬于,所以他們喜歡你Do you like you?你喜歡你嗎?You don't have to try so hard你不必著急You don't have to, give it all away你不必,放棄一切You just have to get up, get up, get up, get up你必須起床,起來,起來,起來You don't have to change a single thing你不需要改變?nèi)魏问耏ou don't have to try, try, try, try你不必嘗試,嘗試,嘗試,嘗試You don't have to try, try, try, try你不必嘗試,嘗試,嘗試,嘗試You don't have to try, try, try, try你不必嘗試,嘗試,嘗試,嘗試You don't have to try你不必嘗試Yooou don't have to tryyooou不去嘗試Oooh哦~~Oooh哦~~Get your shopping on, at the mall, extra credit card讓您的購物,在商場,額外的信用卡You don't have to choose, buy it all, so they like you你沒有選擇,購買它,所以他們喜歡你Do they like you?他們喜歡你嗎?Wait a second,等一等Why, should you care, what they think of you為什么,你應(yīng)該關(guān)心,他們怎么看待你When you're all alone, by yourself, do you like you?當(dāng)你獨自一人,由你自己,你喜歡你嗎?Do you like you?你喜歡你嗎?You don't have to try so hard你不必著急You don't have to, give it all away你不必,放棄一切You just have to get up, get up, get up, get up你必須起床,起來,起來,起來You don't have to change a single thing你不需要改變?nèi)魏问耏ou don't have to try so hard你不必著急You don't have to, give it all away你不必,放棄一切You just have to get up, get up, get up, get up你必須起床,起來,起來,起來You don't have to change a single thing你不需要改變?nèi)魏问耏ou don't have to try, try, try, try你不必嘗試,嘗試,嘗試,嘗試You don't have to try, try, try, try你不必嘗試,嘗試,嘗試,嘗試You don't have to try你不必嘗試You don't have to try你不必嘗試You don't have to try, try, try, try你不必嘗試,嘗試,嘗試,嘗試You don't have to try, try, try, try你不必嘗試,嘗試,嘗試,嘗試You don't have to try, try, try, try你不必嘗試,嘗試,嘗試,嘗試You don't have to try你不必嘗試Yooou don't have to tryyooou不去嘗試NooooOoohYou don't have to try so hard你不必著急You don't have to, give it all away你不必,放棄一切You just have to get up, get up, get up, get up你必須起床,起來,起來,起來You don't have to change a single thing你不需要改變?nèi)魏问耏ou don't have to try, try, try, try你不必嘗試,嘗試,嘗試,嘗試You don't have to try, try, try, try你不必嘗試,嘗試,嘗試,嘗試You don't have to try你不必嘗試You don't have to try你不必嘗試