Python程序設(shè)計項目化教程 課件 項目3、4 控制程序執(zhí)行流程、批量數(shù)據(jù)處理

——控制程序執(zhí)行流程e7d195523061f1c0d3ba7f298e59d031c9c3f97027ed136f882110EF8F17BAD1F2C348D17C7856EF46CB4678CC9E44EE1ABA681E3133328A7B4D22AAF822B2429426B2355AA8CC4431B8568D2CF3B73AE9F4AE98D5A0D6A5566EF967553E96D781C502472DAB692B5E92B1CB5B32F40BF8CF6181A24AB2F2CD3A9A53F0FE7F0D4E247476572CCFAC《項目三》2341Contents目錄判斷結(jié)構(gòu)處理數(shù)據(jù)for循環(huán)處理數(shù)據(jù)While循環(huán)處理數(shù)據(jù)靈活運用控制程序流程e7d195523061f1c0d3ba7f298e59d031c9c3f97027ed136f882110EF8F17BAD1F2C348D17C7856EF46CB4678CC9E44EE1ABA681E3133328A7B4D22AAF822B2429426B2355AA8CC4431B8568D2CF3B73AE9F4AE98D5A0D6A5566EF967553E96D781C502472DAB692B5E92B1CB5B32F40BF8CF6181A24AB2F2CD3A9A53F0FE7F0D4E247476572CCFACe7d195523061f1c0d3ba7f298e59d031c9c3f97027ed136f882110EF8F17BAD1F2C348D17C7856EF46CB4678CC9E44EE1ABA681E3133328A7B4D22AAF822B2429426B2355AA8CC4431B8568D2CF3B73AE9F4AE98D5A0D6A5566EF967553E96D781C502472DAB692B5E92B1CB5B32F40BF8CF6181A24AB2F2CD3A9A53F0FE7F0D4E247476572CCFAC1判斷結(jié)構(gòu)處理數(shù)據(jù)1.1 流程控制e7d195523061f1c0d3ba7f298e59d031c9c3f97027ed136f882110EF8F17BAD1F2C348D17C7856EF46CB4678CC9E44EE1ABA681E3133328A7B4D22AAF822B2429426B2355AA8CC4431B8568D2CF3B73AE9F4AE98D5A0D6A5566EF967553E96D781C502472DAB692B5E92B1CB5B32F40BF8CF6181A24AB2F2CD3A9A53F0FE7F0D4E247476572CCFAC流程控制可實現(xiàn)與用戶的交流，并根據(jù)用戶的需求決定程序“做什么”“怎么做”。流程控制的分類：順序結(jié)構(gòu)、選擇結(jié)構(gòu)和循環(huán)結(jié)構(gòu)。1.2

判斷結(jié)構(gòu)e7d195523061f1c0d3ba7f298e59d031c9c3f97027ed136f882110EF8F17BAD1F2C348D17C7856EF46CB4678CC9E44EE1ABA681E3133328A7B4D22AAF822B2429426B2355AA8CC4431B8568D2CF3B73AE9F4AE98D5A0D6A5566EF967553E96D781C502472DAB692B5E92B1CB5B32F40BF8CF6181A24AB2F2CD3A9A53F0FE7F0D4E247476572CCFAC現(xiàn)實生活中，過馬路要看紅綠燈，如果是綠燈才能過馬路，否則需要停止等待。if語句if語句是最簡單的條件判斷語句，它可以控制程序的執(zhí)行流程。【例如】【語法結(jié)構(gòu)】e7d195523061f1c0d3ba7f298e59d031c9c3f97027ed136f882110EF8F17BAD1F2C348D17C7856EF46CB4678CC9E44EE1ABA681E3133328A7B4D22AAF822B2429426B2355AA8CC4431B8568D2CF3B73AE9F4AE98D5A0D6A5566EF967553E96D781C502472DAB692B5E92B1CB5B32F40BF8CF6181A24AB2F2CD3A9A53F0FE7F0D4E247476572CCFAC1.2 判斷結(jié)構(gòu)if.......else語句if.....elif….else語句e7d195523061f1c0d3ba7f298e59d031c9c3f97027ed136f882110EF8F17BAD1F2C348D17C7856EF46CB4678CC9E44EE1ABA681E3133328A7B4D22AAF822B2429426B2355AA8CC4431B8568D2CF3B73AE9F4AE98D5A0D6A5566EF967553E96D781C502472DAB692B5E92B1CB5B32F40BF8CF6181A24AB2F2CD3A9A53F0FE7F0D4E247476572CCFAC1.2 判斷結(jié)構(gòu)if嵌套if嵌套指的是在if或者if-else語句里面包含if或者if-else?！菊Z法結(jié)構(gòu)】e7d195523061f1c0d3ba7f298e59d031c9c3f97027ed136f882110EF8F17BAD1F2C348D17C7856EF46CB4678CC9E44EE1ABA681E3133328A7B4D22AAF822B2429426B2355AA8CC4431B8568D2CF3B73AE9F4AE98D5A0D6A5566EF967553E96D781C502472DAB692B5E92B1CB5B32F40BF8CF6181A24AB2F2CD3A9A53F0FE7F0D4E247476572CCFAC1.2 判斷結(jié)構(gòu)【實例】e7d195523061f1c0d3ba7f298e59d031c9c3f97027ed136f882110EF8F17BAD1F2C348D17C7856EF46CB4678CC9E44EE1ABA681E3133328A7B4D22AAF822B2429426B2355AA8CC4431B8568D2CF3B73AE9F4AE98D5A0D6A5566EF967553E96D781C502472DAB692B5E92B1CB5B32F40BF8CF6181A24AB2F2CD3A9A53F0FE7F0D4E247476572CCFAC2for循環(huán)處理數(shù)據(jù)2.1

循環(huán)結(jié)構(gòu)循環(huán)的類型：條件循環(huán)：有限循環(huán)：無限循環(huán)：滿足循環(huán)條件時一直在執(zhí)行循環(huán)。While循環(huán)重復一定次數(shù)的循環(huán)。如for循環(huán)一直處于循環(huán)狀態(tài)，直到循環(huán)體中執(zhí)行了某個退出循環(huán)的語句才結(jié)束。無限循環(huán)一般用for或while都可以實現(xiàn)。2.2for循環(huán)處理數(shù)據(jù)【語法結(jié)構(gòu)】【應(yīng)用】1.進行數(shù)值循環(huán)使用了range()函數(shù)，此函數(shù)是Python內(nèi)置函數(shù)，用于生成一系列連續(xù)整數(shù)Start—起始位；end—結(jié)束位；step—步長。2.2for循環(huán)處理數(shù)據(jù)【應(yīng)用】2.遍歷字符串使用for循環(huán)語句除了可以循環(huán)數(shù)值，還可以逐個遍歷字符串，每次處理一個字符。運行結(jié)果運行結(jié)果e7d195523061f1c0d3ba7f298e59d031c9c3f97027ed136f882110EF8F17BAD1F2C348D17C7856EF46CB4678CC9E44EE1ABA681E3133328A7B4D22AAF822B2429426B2355AA8CC4431B8568D2CF3B73AE9F4AE98D5A0D6A5566EF967553E96D781C502472DAB692B5E92B1CB5B32F40BF8CF6181A24AB2F2CD3A9A53F0FE7F0D4E247476572CCFAC3while循環(huán)處理數(shù)據(jù)3while循環(huán)處理數(shù)據(jù)判斷條件和if語句是相同的，而什么時候用while呢？在你確定滿足條件而不確定需要的循環(huán)次數(shù)時，那么while是最好的選擇。while循環(huán)和for循環(huán)不同的是，它的停止條件是個人自己設(shè)定的：e7d195523061f1c0d3ba7f298e59d031c9c3f97027ed136f882110EF8F17BAD1F2C348D17C7856EF46CB4678CC9E44EE1ABA681E3133328A7B4D22AAF822B2429426B2355AA8CC4431B8568D2CF3B73AE9F4AE98D5A0D6A5566EF967553E96D781C502472DAB692B5E92B1CB5B32F40BF8CF6181A24AB2F2CD3A9A53F0FE7F0D4E247476572CCFAC4靈活運用控制程序流程4.1

循環(huán)嵌套結(jié)構(gòu)除了單獨使用上述控制結(jié)構(gòu)之外，我們還可以嵌套使用。4.2跳轉(zhuǎn)語句—break語句break語句可以立即終止當前循環(huán)的執(zhí)行，跳出當前所在的循環(huán)結(jié)構(gòu)。i=1foriinrange(5):i+=1print("-------")ifi==3:breakprint(i)這兩個結(jié)果有什么不同？4.2跳轉(zhuǎn)語句—continue語句continue語句只會終止執(zhí)行本次循環(huán)中剩下的代碼，直接從下一次循環(huán)繼續(xù)執(zhí)行。這兩個結(jié)果有什么不同？foriinrange(5):print("-------")printii=1foriinrange(5):i+=1print("-------")ifi==3:continueprint(i)4.2跳轉(zhuǎn)語句—pass語句pass語句，表示空語句。它是為了保持程序結(jié)構(gòu)完整性。pass語句不做任何事情，只用作占位。forletterin'Runoob':ifletter=='o':passprint('執(zhí)行pass塊')print('當前字母:',letter)print("Goodbye!")【本章小結(jié)】本章主要介紹的是Python中的常用語句，包括判斷語句、循環(huán)語句以及其他子句。其中，判斷語句主要是if語句，循環(huán)語句主要是for語句和while語句。在Python開發(fā)中，這些語句的使用頻率非常高，希望讀者可以多加以理解，并熟練掌握它們的使用。THANKYOUe7d195523061f1c0d3ba7f298e59d031c9c3f97027ed136f882110EF8F17BAD1F2C348D17C7856EF46CB4678CC9E44EE1ABA681E3133328A7B4D22AAF822B2429426B2355AA8CC4431B8568D2CF3B73AE9F4AE98D5A0D6A5566EF967553E96D781C502472DAB692B5E92B1CB5B32F40BF8CF6181A24AB2F2CD3A9A53F0FE7F0D4E247476572CCFAC——批量數(shù)據(jù)處理e7d195523061f1c0d3ba7f298e59d031c9c3f97027ed136f882110EF8F17BAD1F2C348D17C7856EF46CB4678CC9E44EE1ABA681E3133328A7B4D22AAF822B2429426B2355AA8CC4431B8568D2CF3B73AE9F4AE98D5A0D6A5566EF967553E96D781C502472DAB692B5E92B1CB5B32F40BF8CF6181A24AB2F2CD3A9A53F0FE7F0D4E247476572CCFAC《項目四》2341Contents目錄批量文本數(shù)據(jù)處理列表數(shù)據(jù)處理字典數(shù)據(jù)處理數(shù)據(jù)的綜合性處理e7d195523061f1c0d3ba7f298e59d031c9c3f97027ed136f882110EF8F17BAD1F2C348D17C7856EF46CB4678CC9E44EE1ABA681E3133328A7B4D22AAF822B2429426B2355AA8CC4431B8568D2CF3B73AE9F4AE98D5A0D6A5566EF967553E96D781C502472DAB692B5E92B1CB5B32F40BF8CF6181A24AB2F2CD3A9A53F0FE7F0D4E247476572CCFACe7d195523061f1c0d3ba7f298e59d031c9c3f97027ed136f882110EF8F17BAD1F2C348D17C7856EF46CB4678CC9E44EE1ABA681E3133328A7B4D22AAF822B2429426B2355AA8CC4431B8568D2CF3B73AE9F4AE98D5A0D6A5566EF967553E96D781C502472DAB692B5E92B1CB5B32F40BF8CF6181A24AB2F2CD3A9A53F0FE7F0D4E247476572CCFAC1批量文本數(shù)據(jù)處理1.1序列e7d195523061f1c0d3ba7f298e59d031c9c3f97027ed136f882110EF8F17BAD1F2C348D17C7856EF46CB4678CC9E44EE1ABA681E3133328A7B4D22AAF822B2429426B2355AA8CC4431B8568D2CF3B73AE9F4AE98D5A0D6A5566EF967553E96D781C502472DAB692B5E92B1CB5B32F40BF8CF6181A24AB2F2CD3A9A53F0FE7F0D4E247476572CCFAC在Python中，序列是最基本的數(shù)據(jù)結(jié)構(gòu)。它是一塊用于存儲多個值的連續(xù)內(nèi)存空間。序列包括字符串、列表、元組、集合和字典，用來表示一組數(shù)據(jù)。序列可通過索引取值1.2序列基本運算e7d195523061f1c0d3ba7f298e59d031c9c3f97027ed136f882110EF8F17BAD1F2C348D17C7856EF46CB4678CC9E44EE1ABA681E3133328A7B4D22AAF822B2429426B2355AA8CC4431B8568D2CF3B73AE9F4AE98D5A0D6A5566EF967553E96D781C502472DAB692B5E92B1CB5B32F40BF8CF6181A24AB2F2CD3A9A53F0FE7F0D4E247476572CCFAC乘法4切片2序列相加3索引1檢查某個元素是否是序列的成員5計算序列的長度、最大值和最小值61.3類型轉(zhuǎn)換e7d195523061f1c0d3ba7f298e59d031c9c3f97027ed136f882110EF8F17BAD1F2C348D17C7856EF46CB4678CC9E44EE1ABA681E3133328A7B4D22AAF822B2429426B2355AA8CC4431B8568D2CF3B73AE9F4AE98D5A0D6A5566EF967553E96D781C502472DAB692B5E92B1CB5B32F40BF8CF6181A24AB2F2CD3A9A53F0FE7F0D4E247476572CCFAClist()—將序列轉(zhuǎn)換成列表str()—將序列轉(zhuǎn)換成字符串tuple()—將序列轉(zhuǎn)換成元組e7d195523061f1c0d3ba7f298e59d031c9c3f97027ed136f882110EF8F17BAD1F2C348D17C7856EF46CB4678CC9E44EE1ABA681E3133328A7B4D22AAF822B2429426B2355AA8CC4431B8568D2CF3B73AE9F4AE98D5A0D6A5566EF967553E96D781C502472DAB692B5E92B1CB5B32F40BF8CF6181A24AB2F2CD3A9A53F0FE7F0D4E247476572CCFAC2列表數(shù)據(jù)處理2.1

列表概述e7d195523061f1c0d3ba7f298e59d031c9c3f97027ed136f882110EF8F17BAD1F2C348D17C7856EF46CB4678CC9E44EE1ABA681E3133328A7B4D22AAF822B2429426B2355AA8CC4431B8568D2CF3B73AE9F4AE98D5A0D6A5566EF967553E96D781C502472DAB692B5E92B1CB5B32F40BF8CF6181A24AB2F2CD3A9A53F0FE7F0D4E247476572CCFAC列表（list）是一個有序的序列結(jié)構(gòu)，序列中的元素可以是不同的數(shù)據(jù)類型。例如：A=[1,'xiaoWang','a',[2,'b']]2.2

列表的常見操作e7d195523061f1c0d3ba7f298e59d031c9c3f97027ed136f882110EF8F17BAD1F2C348D17C7856EF46CB4678CC9E44EE1ABA681E3133328A7B4D22AAF822B2429426B2355AA8CC4431B8568D2CF3B73AE9F4AE98D5A0D6A5566EF967553E96D781C502472DAB692B5E92B1CB5B32F40BF8CF6181A24AB2F2CD3A9A53F0FE7F0D4E247476572CCFAC添加、修改和刪除列表元素訪問列表元素列表的創(chuàng)建和刪除對列表進行統(tǒng)計計算對列表進行排序二維列表的使用2.2列表的常見操作e7d195523061f1c0d3ba7f298e59d031c9c3f97027ed136f882110EF8F17BAD1F2C348D17C7856EF46CB4678CC9E44EE1ABA681E3133328A7B4D22AAF822B2429426B2355AA8CC4431B8568D2CF3B73AE9F4AE98D5A0D6A5566EF967553E96D781C502472DAB692B5E92B1CB5B32F40BF8CF6181A24AB2F2CD3A9A53F0FE7F0D4E247476572CCFAC使用賦值運算符直接創(chuàng)建列表1創(chuàng)建空列表2創(chuàng)建數(shù)值列表3創(chuàng)建列表2.2列表的常見操作e7d195523061f1c0d3ba7f298e59d031c9c3f97027ed136f882110EF8F17BAD1F2C348D17C7856EF46CB4678CC9E44EE1ABA681E3133328A7B4D22AAF822B2429426B2355AA8CC4431B8568D2CF3B73AE9F4AE98D5A0D6A5566EF967553E96D781C502472DAB692B5E92B1CB5B32F40BF8CF6181A24AB2F2CD3A9A53F0FE7F0D4E247476572CCFAC直接使用print()函數(shù)輸出1索引2切片3訪問列表元素2.2列表的常見操作e7d195523061f1c0d3ba7f298e59d031c9c3f97027ed136f882110EF8F17BAD1F2C348D17C7856EF46CB4678CC9E44EE1ABA681E3133328A7B4D22AAF822B2429426B2355AA8CC4431B8568D2CF3B73AE9F4AE98D5A0D6A5566EF967553E96D781C502472DAB692B5E92B1CB5B32F40BF8CF6181A24AB2F2CD3A9A53F0FE7F0D4E247476572CCFAC直接使用for循環(huán)1使用for循環(huán)和enumerate()函數(shù)2遍歷列表2.2列表的常見操作e7d195523061f1c0d3ba7f298e59d031c9c3f97027ed136f882110EF8F17BAD1F2C348D17C7856EF46CB4678CC9E44EE1ABA681E3133328A7B4D22AAF822B2429426B2355AA8CC4431B8568D2CF3B73AE9F4AE98D5A0D6A5566EF967553E96D781C502472DAB692B5E92B1CB5B32F40BF8CF6181A24AB2F2CD3A9A53F0FE7F0D4E247476572CCFAC根據(jù)索引值刪除1根據(jù)元素值刪除2添加、修改和刪除列表元素2.2列表的常見操作e7d195523061f1c0d3ba7f298e59d031c9c3f97027ed136f882110EF8F17BAD1F2C348D17C7856EF46CB4678CC9E44EE1ABA681E3133328A7B4D22AAF822B2429426B2355AA8CC4431B8568D2CF3B73AE9F4AE98D5A0D6A5566EF967553E96D781C502472DAB692B5E92B1CB5B32F40BF8CF6181A24AB2F2CD3A9A53F0FE7F0D4E247476572CCFAC使用列表對象的sort()方法1使用內(nèi)置的sorted()函數(shù)2對列表進行排序e7d195523061f1c0d3ba7f298e59d031c9c3f97027ed136f882110EF8F17BAD1F2C348D17C7856EF46CB4678CC9E44EE1ABA681E3133328A7B4D22AAF822B2429426B2355AA8CC4431B8568D2CF3B73AE9F4AE98D5A0D6A5566EF967553E96D781C502472DAB692B5E92B1CB5B32F40BF8CF6181A24AB2F2CD3A9A53F0FE7F0D4E247476572CCFAC3字典數(shù)據(jù)處理3.1字典概述e7d195523061f1c0d3ba7f298e59d031c9c3f97027ed136f882110EF8F17BAD1F2C348D17C7856EF46CB4678CC9E44EE1ABA681E3133328A7B4D22AAF822B2429426B2355AA8CC4431B8568D2CF3B73AE9F4AE98D5A0D6A5566EF967553E96D781C502472DAB692B5E92B1CB5B32F40BF8CF6181A24AB2F2CD3A9A53F0FE7F0D4E247476572CCFAC字典是一種存儲數(shù)據(jù)的容器，它和列表一樣，都可以存儲多個數(shù)據(jù)。

info={'name':'班長','sex':'f','address':'北京'}每個元素都是由兩部分組成的，分別是鍵和值。‘name’為鍵，‘班長’為值。

3.2字典的常見操作e7d195523061f1c0d3ba7f298e59d031c9c3f97027ed136f882110EF8F17BAD1F2C348D17C7856EF46CB4678CC9E44EE1ABA681E3133328A7B4D22AAF822B2429426B2355AA8CC4431B8568D2CF3B73AE9F4AE98D5A0D6A5566EF967553E96D781C502472DAB692B5E92B1CB5B32F40BF8CF6181A24AB2F2CD3A9A53F0FE7F0D4E247476572CCFAC添加、修改和刪除字典元素4

通過鍵值對訪問字典2遍歷字典3字典的創(chuàng)建和刪除1字典推導式53.2字典的常見操作e7d195523061f1c0d3ba7f298e59d031c9c3f97027ed136f882110EF8F17BAD1F2C348D17C7856EF46CB4678CC9E44EE1ABA681E3133328A7B4D22AAF822B2429426B2355AA8CC4431B8568D2CF3B73AE9F4AE98D5A0D6A5566EF967553E96D781C502472DAB692B5E92B1CB5B32F40BF8CF6181A24AB2F2CD3A9A53F0FE7F0D4E247476572CCFAC根據(jù)鍵訪問值1如果不確定字典中是否存在某個鍵而又想獲取其值時，可以使用get方法，還可以設(shè)置默認值。2訪問字典元素3.2字典的常見操作e7d195523061f1c0d3ba7f298e59d031c9c3f97027ed136f882110EF8F17BAD1F2C348D17C7856EF46CB4678CC9E44EE1ABA681E3133328A7B4D22AAF822B2429426B2355AA8CC4431B8568D2CF3B73AE9F4AE98D5A0D6A5566EF967553E96D781C502472DAB692B5E92B1CB5B32F40BF8CF6181A24AB2F2CD3A9A53F0FE7F0D4E247476572CCFAC使用del()方法刪除1使用clear()方法刪除2添加、修改和刪除字典元素3.2字典的常見操作e7d195523061f1c0d3ba7f298e59d031c9c3f97027ed136f882110EF8F17BAD1F2C348D17C7856EF46CB4678CC9E44EE1ABA681E3133328A7B4D22AAF822B2429426B2355AA8CC4431B8568D2CF3B73AE9F4AE98D5A0D6A5566EF967553E96D781C502472DAB692B5E92B1CB5B32F40BF8CF6181A24AB2F2CD3A9A53F0FE7F0D4E247476572CCFAC使用key()方法返回在字典中的所有可用的鍵的列表獲取字典中鍵的列表dict={'Name':'Zara','Age':7};print(dict.keys())3.2字典的常見操作e7d195523061f1c0d3ba7f298e59d031c9c3f97027ed136f882110EF8F17BAD1F2C348D17C7856EF46CB4678CC9E44EE1ABA681E3133328A7B4D22AAF822B2429426B2355AA8CC4431B8568D2CF3B73AE9F4AE98D5A0D6A5566EF967553E96D781C502472DAB692B5E92B1CB5B32F40BF8CF6181A24AB2F2CD3A9A53F0FE7F0D4E247476572CCFAC使用values()方法返回在字典中的所有可用的值的列表獲取字典中值的列表dict={'Name':'Zara','Age':7};print(dict.values())3.2字典的常見操作e7d195523061f1c0d3ba7f298e59d031c9c3f97027ed136f882110EF8F17BAD1F2C348D17C7856EF46CB4678CC9E44EE1ABA681E3133328A7B4D22AAF822B2429426B2355AA8CC4431B8568D2CF3B73AE9F4AE98D5A0D6A5566EF967553E96D781C502472DAB692B5E92B1CB5B32F40BF8CF6181A24AB2F2CD3A9A53F0FE7F0D4E247476572CCFAC使用items()方法返回字典的(鍵，值)元組對的列表計算字典中鍵值對的個數(shù)dict={'Name':'Zara','Age':7}print("Value:%s"%dict.items())3.2字典的常見操作e7d195523061f1c0d3ba7f298e59d031c9c3f97027ed136f882110EF8F17BAD1F2C348D17C7856EF46CB4678CC9E44EE1ABA681E3133328A7B4D22AAF822B2429426B2355AA8CC4431B8568D2CF3B73AE9F4AE98D5A0D6A5566EF967553E96D781C502472DAB692B5E92B1CB5B32F40BF8CF6181A24AB2F2CD3A9A53F0FE7F0D4E247476572CCFAC直接使用for循環(huán)遍歷字典的鍵、值、元素、鍵值對dict={'Name':'Zara','Age':7}foritemindict.items():print(item)e7d195523061f1c0d3ba7f298e59d031c9c3f97027ed136f882110EF8F17BAD1F2C348D17C7856EF46CB4678CC9E44EE1ABA681E3133328A7B4D22AAF822B2429426B2355AA8CC4431B8568D2CF3B73AE9F4AE98D5A0D6A5566EF967553E96D781C502472DAB692B5E92B1CB5B32F40BF8CF6181A24AB2F2CD3A9A53F0FE7F0D4E247476572CCFAC4數(shù)據(jù)的綜合性處理4.1元組概述e7d195523061f1c0d3ba7f298e59d031c9c3f97027ed136f882110EF8F17BAD1F2C348D17C7856EF46CB4678CC9E44EE1ABA681E3133328A7B4D22AAF822B2429426B2355AA8CC4431B8568D2CF3B73AE9F4AE98D5A0D6A5566EF967553E96D781C502472DAB692B5E92B1CB5B32F40BF8CF6181A24AB2F2CD3A9A53F0FE7F0D4E247476572CCFACPython的元組與列表類似，不同之處在于元組的元素不能修改。元組使用小括號，列表使用方括號。tup1=('physics','chemistry',1997,2000)tup2=(1,2,3,4,5)tup3="a","b","c","d"4.2元組的常見操作e7d195523061f1c0d3ba7f298e59d031c9c3f97027ed136f882110EF8F17BAD1F2C348D17C7856EF46CB4678CC9E44EE1ABA681E3133328A7B4D22AAF822B2429426B2355AA8CC4431B8568D2CF3B73AE9F4AE98D5A0D6A5566EF967553E96D781C502472DAB692B5E92B1CB5B32F40BF8CF6181A24AB2F2CD3A9A53F0FE7F0D4E247476572CCFAC元組推導式4訪問元組元素2修改元組元素3元組的創(chuàng)建和刪除1元組與列表的區(qū)別54.2元組的常見操作e7d195523061f1c0d3ba7f298e59d031c9c3f97027ed136f882110EF8F17BAD1F2C348D17C7856EF46CB4678CC9E44EE1ABA681E3133328A7B4D22AAF822B2429426B2355AA8CC4431B8568D2CF3B73AE9F4AE98D5A0D6A5566EF967553E96D781C502472DAB692B5E92B1CB5B32F40BF8CF6181A24AB2F2CD3A9A53F0FE7F0D4E247476572CCFAC元組可以使用下標索引來訪問元組中的值訪問元組tuple=('hello',100,4.5)print(tuple[0])print(tuple[1])print(tuple[2])4.2元組的常見操作e7d195523061f1c0d3ba7f298e59d031c9c3f97027ed136f882110EF8F17BAD1F2C348D17C7856EF46CB4678CC9E44EE1ABA681E3133328A7B4D22AAF822B2429426B2355AA8CC4431B8568D2CF3B73AE9F4AE98D5A0D6A5566EF967553E96D781C502472DAB692B5E92B1CB5B32F40BF8CF6181A24AB2F2CD3A9A53F0FE7F0D4E247476572CCFAC元組不允許修改元素tup1=(12,34.56);tup2=('abc','xyz')#以下修改元組元素操作是非法的。tup1[0]=1004.2元組的常見操作e7d195523061f1c0d3ba7f298e59d031c9c3f97027ed136f882110EF8F17BAD1F2C348D17C7856EF46CB4678CC9E44EE1ABA681E3133328A7B4D22AAF822B2429426B2355AA8CC4431B8568D2CF3B73AE9F4AE98D5A0D6A5566EF967553E96D781C502472DAB692B5E92B1CB5B32F40BF8CF6181A24AB2F2CD3A9A53F0FE7F0D4E247476572CCFAC元組的遍歷a_turple=(1,2,3,4,5)fornumina_turple:print(num,end="”)4.2元組的常見操作e7d195523061f1c0d3ba7f298e59d031c9c3f97027ed136f882110EF8F17BAD1F2C348D17C7856EF46CB4678CC9E44EE1ABA681E3133328A7B4D22AAF822B2429426B2355AA8CC4431B8568D2CF3B73AE9F4AE98D5A0D6A5566EF967553E96D781C502472DAB692B5E92B1CB5B32F40BF8CF6181A24AB2F2CD3A9A53F0FE7F0D4E247476572CCFAC元組的內(nèi)置函數(shù)方法描述len(tuple)

計算元組元素個數(shù)max(tuple)

返回元組中元素最大值min(tuple)

返回元組中元素最小值tuple(seq)

將列表轉(zhuǎn)為元組4.3生成器概述e7d195523061f1c0d3ba7f298e59d031c9c3f97027ed136f882110EF8F17BAD1F2C348D17C7856EF46CB4678CC9E44EE1ABA681E3133328A7B4D22AAF822B2429426B2355AA8CC4431B8568D2CF3B73AE9F4AE98D5A0D6A5566EF967553E96D781C502472DAB692B5E92B1CB5B32F40BF8CF6181A24AB2F2CD3A9A53F0FE7F0D4E247476572CCFAC在Python中，受到內(nèi)存限制，列表、元組、字典的容量都是有限的。按照某種算法推算出其中的元素，一邊循環(huán)一邊計算的機制，稱為生成器：generator。4.4列表推導式e7d195523061f1c0d3ba7f298e59d031c9c3f97027ed136f882110EF8F17BAD1F2C348D17C7856EF46CB4678CC9E44EE1ABA681E3133328A7B4D22AAF822B2429426B2355AA8CC4431B8568D2CF3B73AE9F4AE98D5A0D6A5566EF967553E96D781C502472DAB692B5E92B1CB5B32F40BF8CF6181A24AB2F2CD3A9A53F0FE7F0D4E247476572CCFAC列表推導式可以快速生成一個列表，或者根據(jù)某個列表生成滿足指定需求的列表。importrandomlist_0=[random.randint(10,100)foriinrange(5)]print(list_0)4.5元組推導式e7d195523061f1c0d3ba7f298e59d031c9c3f97027ed136f882110EF8F17BAD1F2C348D17C7856EF46CB4678CC9E44EE1ABA681E3133328A7B4D22AAF822B2429426B2355AA8CC4431B8568D2CF3B73AE9F4AE98D5A0D6A5566EF967553E96D781C502472DAB692B5E92B1CB5B32F40BF8CF6181A24AB2F2CD3A9A53F0FE7F0D4E247476572CCFAC元組推導式可以快速