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="	") # '
'是换行，'	'是tab
        wieth+=1
    print()
    high+=1