排序并输出

L=[95.5,85,59,66,72]

L.sort(reverse=True)

print(L)

#sort() sort() 函数用于对原列表进行排序;

#reverse排列顺序

#reverse=True,降序排列，

#reverse=False,升序排列，

也可以写作：

L=[95.5,85,59,66,72]

L.sort()

L.reverse()

print(L)

使用while True和break，计算0~1000以内，所有偶数的和。

num=0

sum=0

while True:

    if num>1000:

        break

    if num%2==0:

        sum=sum+num

    num=num+1

print(sum)

用while和continue求0~1000的偶数和

num = 0

sum = 0

while num < 1000:

    num = num + 1

    if num % 2 == 0:

        sum = sum + num

        continue  

print(sum)

#continue后面没有可执行的语句，if成立时continue继续，if不成立,则不执行(逻辑不好），while循环完成后输出结果

或者

num = 0
sum = 0
while num <= 1000:
       num = num + 1
       if num % 2 == 1:
             continue 

       sum = sum + num

print(sum)

 #if语句成立时（num为奇数时），执行到continue，跳过continue之后的sum语句；if语句不成立（num为偶数）时，才会执行continue后面的sum计算    

L = [75, 92, 59, 68, 99]

sum=0

for a in L:

    sum=sum+a

print(sum/5)  #放到for循环外面

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sdff

数据类型：

整型，浮点数，布尔值，字符串，空值

0b开头二进制

0x开头十六进制

空值用None表示

python添加set元素：add()和update()

动态语言

四则运算

所以默认参数只能定义在必需参数的后面，否则将会出现错误

函数参数可以是任意的数据类型，只要函数内部逻辑可以处理即可。