Python阶段复习

1、实现1-100的所有的和

# 方法1：
 sum = 0
 for i in range(1,101):
     sum += i
 print(sum)
 
 # 方法2：
 num1 = int(input('请输入起始数字'))
 num2 = int(input('请输入末尾数字'))
 sum = (num1 + num2) * num2 / 2
 print(int(sum))

2、实现1-500所有奇数的和

sum = 0
for i in range(1,501):
     _,result = divmod(i,2)
     if not result:
         sum += i

 print(sum)

3、实现1!+2!+3!+4!...+20!的结果

sum = 0
result = 0
for i in range(1,21):
    if i == 1:
        sum = i
    else:
        for j in range(1,i+1):
            if j == 1:
                result = 1
            else:
                result *= j
    sum += result
print(sum)

4、对指定的list进行排序[2,32,43,453,54,6,576,5,7,6,8,78,7,89]

# sorted()拷贝排序
li = [2,32,43,453,54,6,576,5,7,6,8,78,7,89]
new_li= sorted(li)
print(li)  # 原列表不变
print(new_li)

# sort()是原地排序
li = [2,32,43,453,54,6,576,5,7,6,8,78,7,89]
li.sort()
print(li)  # 直接对原列表进行修改