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排序并輸出

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

L.sort(reverse=True)

print(L)

#sort()?sort()?函數用于對原列表進行排序;

#reverse排列順序

#reverse=True,降序排列，

#reverse=False,升序排列，

也可以寫作：

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

L.sort()

L.reverse()

print(L)

使用while True和break，計算0~1000以內，所有偶數的和。

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的偶數和

num = 0

sum = 0

while num < 1000:

? ? num = num + 1

? ? if num % 2 == 0:

? ? ? ? sum = sum + num

? ? ? ? continue??

print(sum)

#continue后面沒有可執行的語句，if成立時continue繼續，if不成立,則不執行(邏輯不好），while循環完成后輸出結果

或者

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

? ? ? ?sum = sum + num

print(sum)

?#if語句成立時（num為奇數時），執行到continue，跳過continue之后的sum語句；if語句不成立（num為偶數）時，才會執行continue后面的sum計算? ??

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

sum=0

for a in L:

? ? sum=sum+a

print(sum/5)? #放到for循環外面

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數據類型：

整型，浮點數，布爾值，字符串，空值

0b開頭二進制

0x開頭十六進制

空值用None表示

python添加set元素：add()和update()

動態語言

四則運算

所以默認參數只能定義在必需參數的后面，否則將會出現錯誤

函數參數可以是任意的數據類型，只要函數內部邏輯可以處理即可。