自学python的日记分享

2019.4.22登记

课堂笔记 2019.4.8

在windows环境下，用python写出第一个程序“hello world”

 print("Hello World!!!")

课堂笔记 2019.4.12

在windows环境下，用python写出第一个用户交互程序“input”

 death_age=120

 print("game star")
 print("")
 print("")

 name=input("input your name:")
 age=input("input your age:")

 print(name,"still able to live",death_age-int(age),"years")

课堂笔记2019.4.13

python程序<数字比大小>： 用户输入3个数字，输出最大的数字和最小的数字

 #My idea

 '''
 No1=int(input("please input first number:"))
 No2=int(input("please input scend number:"))
 No3=int(input("please input third number:"))

 if No1>No2>No3:
     print("Max No is No1:",No1,"Min No is No3:",No3)
 elif No1>No3>No2:
     print("Max No is No1:",No1,"Min No is No2:",No2)
 elif No2>No1>No3:
     print("Max No is No2:",No2,"Min No is No3:",No3)
 elif No2>No3>No1:
     print("Max No is No2:",No2,"Min No is No1:",No1)
 elif No3>No1>No2:
     print("Max No is No3:",No3,"Min No is No2:",No2)
 elif No3>No2>No1:
     print("Max No is No3:",No3,"Min No is No1:",No1)
 '''

 #teather's idea. only MaxNo,no MinNo

 '''
 No1=int(input("please input first number:"))
 No2=int(input("please input scend number:"))
 No3=int(input("please input third number:"))

 No=0

 if No1>No2:
     No=No1
     if No>No3:
         print("Max No is:",No)
     else:
         print("Max No is:",No3)
 else:
     No=No2
     if No>No3:
         print("Max No is:",No)
     else:
         print("Max No is:",No3)
 '''

 #bettet idea

 No1=int(input("please input first number:"))
 No2=int(input("please input scend number:"))
 No3=int(input("please input third number:"))

 max_No=0
 min_No=0

 if No1>No2:
     max_No=No1
     if max_No<No3:
         min_No=No2
         print("Max No is:",No3,"Min No is:",min_No)
     else:
         if No2<No3:
             min_No=No2
             print("Max No is:",max_No,"Min No is:",min_No)
         else:
             min_No=No3
             print("Max No is:",max_No,"Min No is:",min_No)
 else:
     max_No=No2
     if max_No<No3:
         min_No=No1
         print("Max No is:",No3,"Min No is:",min_No)
     else:
         if No1<No3:
             min_No=No1
             print("Max No is:",max_No,"Min No is:",min_No)
         else:
             min_No=No3
             print("Max No is:",max_No,"Min No is:",min_No)

课堂笔记2019.4.14

python的四种运算符：算数运算符，赋值运算符，比较运算符，逻辑运算符。

算数运算符：+，-，*，/，//，%，**

赋值运算符：word="hello"（赋值字符串） ， word=23（赋值数字）

比较运算符：<,>,==,!=

逻辑运算符：not , and , or （and和or有短路原则，如果条件1结果已知，后续代码不再执行）

课堂笔记2019.4.15

while语句：打印1-10

 #打印1=10
 No = 1

 while No<=10:
      print(No)
      No+=1

课堂笔记2019.4.16

1.编写一个猜测年龄的程序

 #猜年轻

 ''' 用if语句判断
 goal_age=76

 guess_age=int(input("please guess age(1-100):"))

 # print(guess_age,goal_age)

 if(guess_age==goal_age):
  print("you got it")
 else:
  print("sorry,you are wrong")
 '''

 #利用while实现一直输入
 '''
 暂时无法实现2个问题：
 1.从输错了数字开始算起的区间（比如输入两个数字（34，89）后，无法提醒在（34-89）之间的数字猜测）
     2019.4.22号已自行解决
 2.由用户自己选择放弃猜测退出程序. 2019.5.6 已解决

 '''
 goal_age = 76

 guess_age = int(input("please guess age(1-100):"))
 guess_maxage = 100
 guess_minage = 1

 while guess_age != goal_age:

     if guess_age < goal_age:  # 判断输入的数字是否正确
         print()
         if guess_age > guess_minage:  # 用来取输入后的最小值
             guess_minage = guess_age
         print("your input number is:", guess_age)
         print("that's too small... please guess ", guess_minage, "- ", guess_maxage, "!!")
     elif guess_age > goal_age:
         print()
         if guess_age < guess_maxage:  # 用来取输入后的最大值
             guess_maxage = guess_age
         print("your input number is:", guess_age)
         print("that's too big... please guess ", guess_minage, " -", guess_maxage, "!!")

     guess_age = input("you can input 'give up' go to out or guess again:")

         if guess_age == "give up":
         print("It's so pity!!!")
         break

     guess_age = int(guess_age)

 else:
     print("you got it")

2.输出1-100之间的偶数

 #输入1-100之间的偶数

 No=1

 while No<=100:
     if No%2==0:
         print(No)
     No+=1

3.语法1：break 用来跳出本循环，continue用来结束本次循环。

语法2：print(“abc”,end=“”) “abc”后面不换行，继续显示打印的内容。

　语法3：while ... else... 非break中止的程序，都会执行else后的程序 。

课堂笔记2019.4.19

编写九九乘法表

 '''
 个人思路：
 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
 '''

 high =1

 while high<=9:
     wieth=1
     while wieth<=high:
         print(wieth,"*",high,"=",wieth*high,end="\t") # '\n'是换行，'\t'是tab
         wieth+=1
     print()
     high+=1