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”
1 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”
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")
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
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)
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
1 #打印1=10
2 No = 1
3
4 while No<=10:
5 print(No)
6 No+=1
课堂笔记2019.4.16
1.编写一个猜测年龄的程序
1 #猜年轻
2
3 ''' 用if语句判断
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实现一直输入
17 '''
18 暂时无法实现2个问题：
19 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）
20 2019.4.22号已自行解决
21 2.由用户自己选择放弃猜测退出程序. 2019.5.6 已解决
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: # 判断输入的数字是否正确
33 print()
34 if guess_age > guess_minage: # 用来取输入后的最小值
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: # 用来取输入后的最大值
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")
2.输出1-100之间的偶数
1 #输入1-100之间的偶数
2
3 No=1
4
5 while No<=100:
6 if No%2==0:
7 print(No)
8 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
1 '''
2 个人思路：
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'是换行，'\t'是tab
12 wieth+=1
13 print()
14 high+=1