自學python的日記分享

• 2020 年 1 月 16 日
• 筆記

2019.4.22登記

課堂筆記 2019.4.8

在windows環境下，用python寫出第一個程式「hello world」

1 print("Hello World!!!")

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課堂筆記 2019.4.12

在windows環境下，用python寫出第一個用戶交互程式「input」

 1 death_age=120   2   3 print("game star")   4 print("")   5 print("")   6   7 name=input("input your name:")   8 age=input("input your age:")   9  10  11 print(name,"still able to live",death_age-int(age),"years")

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課堂筆記2019.4.13

python程式<數字比大小>： 用戶輸入3個數字，輸出最大的數字和最小的數字

 1 #My idea   2   3 '''   4 No1=int(input("please input first number:"))   5 No2=int(input("please input scend number:"))   6 No3=int(input("please input third number:"))   7   8 if No1>No2>No3:   9     print("Max No is No1:",No1,"Min No is No3:",No3)  10 elif No1>No3>No2:  11     print("Max No is No1:",No1,"Min No is No2:",No2)  12 elif No2>No1>No3:  13     print("Max No is No2:",No2,"Min No is No3:",No3)  14 elif No2>No3>No1:  15     print("Max No is No2:",No2,"Min No is No1:",No1)  16 elif No3>No1>No2:  17     print("Max No is No3:",No3,"Min No is No2:",No2)  18 elif No3>No2>No1:  19     print("Max No is No3:",No3,"Min No is No1:",No1)  20 '''  21  22  23 #teather's idea. only MaxNo,no MinNo  24  25 '''  26 No1=int(input("please input first number:"))  27 No2=int(input("please input scend number:"))  28 No3=int(input("please input third number:"))  29  30 No=0  31  32 if No1>No2:  33     No=No1  34     if No>No3:  35         print("Max No is:",No)  36     else:  37         print("Max No is:",No3)  38 else:  39     No=No2  40     if No>No3:  41         print("Max No is:",No)  42     else:  43         print("Max No is:",No3)  44 '''  45  46 #bettet idea  47  48 No1=int(input("please input first number:"))  49 No2=int(input("please input scend number:"))  50 No3=int(input("please input third number:"))  51  52 max_No=0  53 min_No=0  54  55 if No1>No2:  56     max_No=No1  57     if max_No<No3:  58         min_No=No2  59         print("Max No is:",No3,"Min No is:",min_No)  60     else:  61         if No2<No3:  62             min_No=No2  63             print("Max No is:",max_No,"Min No is:",min_No)  64         else:  65             min_No=No3  66             print("Max No is:",max_No,"Min No is:",min_No)  67 else:  68     max_No=No2  69     if max_No<No3:  70         min_No=No1  71         print("Max No is:",No3,"Min No is:",min_No)  72     else:  73         if No1<No3:  74             min_No=No1  75             print("Max No is:",max_No,"Min No is:",min_No)  76         else:  77             min_No=No3  78             print("Max No is:",max_No,"Min No is:",min_No)

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課堂筆記2019.4.14

python的四種運算符：算數運算符，賦值運算符，比較運算符，邏輯運算符。

算數運算符：+，-，*，/，//，%，**

賦值運算符：word="hello"（賦值字元串） ， word=23（賦值數字）

比較運算符：<,>,==,!=

邏輯運算符：not , and , or （and和or有短路原則，如果條件1結果已知，後續程式碼不再執行）

課堂筆記2019.4.15

while語句：列印1-10

1 #列印1=10  2 No = 1  3  4 while No<=10:  5      print(No)  6      No+=1

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課堂筆記2019.4.16

1.編寫一個猜測年齡的程式

 1 #猜年輕   2   3 ''' 用if語句判斷   4 goal_age=76   5   6 guess_age=int(input("please guess age(1-100):"))   7   8 # print(guess_age,goal_age)   9  10 if(guess_age==goal_age):  11  print("you got it")  12 else:  13  print("sorry,you are wrong")  14 '''  15  16 #利用while實現一直輸入  17 '''  18 暫時無法實現2個問題：  19 1.從輸錯了數字開始算起的區間（比如輸入兩個數字（34，89）後，無法提醒在（34-89）之間的數字猜測）  20     2019.4.22號已自行解決  21 2.由用戶自己選擇放棄猜測退出程式. 2019.5.6 已解決  22  23 '''  24 goal_age = 76  25  26 guess_age = int(input("please guess age(1-100):"))  27 guess_maxage = 100  28 guess_minage = 1  29  30 while guess_age != goal_age:  31  32     if guess_age < goal_age:  # 判斷輸入的數字是否正確  33         print()  34         if guess_age > guess_minage:  # 用來取輸入後的最小值  35             guess_minage = guess_age  36         print("your input number is:", guess_age)  37         print("that's too small... please guess ", guess_minage, "- ", guess_maxage, "!!")  38     elif guess_age > goal_age:  39         print()  40         if guess_age < guess_maxage:  # 用來取輸入後的最大值  41             guess_maxage = guess_age  42         print("your input number is:", guess_age)  43         print("that's too big... please guess ", guess_minage, " -", guess_maxage, "!!")  44  45     guess_age = input("you can input 'give up' go to out or guess again:")  46  47         if guess_age == "give up":  48         print("It's so pity!!!")  49         break  50  51     guess_age = int(guess_age)  52  53 else:  54     print("you got it")

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2.輸出1-100之間的偶數

1 #輸入1-100之間的偶數  2  3 No=1  4  5 while No<=100:  6     if No%2==0:  7         print(No)  8     No+=1

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3.語法1：break 用來跳出本循環，continue用來結束本次循環。

   語法2：print(「abc」,end=「」) 「abc」後面不換行，繼續顯示列印的內容。

　語法3：while … else… 非break中止的程式，都會執行else後的程式 。

課堂筆記2019.4.19

編寫九九乘法表

 1 '''   2 個人思路：   3 九九乘法表。 a=1  while a <= 9: b=1  while b<=a:print((b,」*」,a,b*a),end(「,」))   b+=1  a+=1   4 '''   5   6 high =1   7   8 while high<=9:   9     wieth=1  10     while wieth<=high:  11         print(wieth,"*",high,"=",wieth*high,end="t") # 'n'是換行，'t'是tab  12         wieth+=1  13     print()  14     high+=1

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