第2章-1 计算 11+12+13+...+m

sum = 0
start = 11
end = eval(input())
for i in range(start,end+1):
    sum = sum + i
print("sum =",sum)

第2章-2 计算分段函数[1]

num = eval(input())
if num == 0:
   num = format(num,'.1f')
   print("f(",num,") = ",num,sep = '')
else:
   res = 1.0/num
   num = format(num,'.1f')
   print("f(",num,") = ",format(res,'.1f'),sep = '')

第2章-3 阶梯电价

power_consumption = eval(input())
if power_consumption < 0:
    print("Invalid Value!")
else:
    if power_consumption <= 50:
        cost = 0.53*power_consumption

    else:
        cost = 0.53*50+(power_consumption-50)*(0.53+0.05)
    print("cost = ",format(cost,'.2f'),sep = '')

第2章-4 特殊a串数列求和

a,n = map(int,input().split(" "))
sum = 0
for i in range(n):
    res = a*(pow(10,i)*(n-i))
    sum = sum + res
print("s = ",sum,sep = '')

第2章-5 求奇数分之一序列前N项和

num = eval(input())
sum = 0
count = 1
for i in range(num):
    sum = sum + 1/count
    count = count + 2
print("sum = ",format(sum,'.6f'),sep = '')

第2章-6 求交错序列前N项和

num = eval(input())
sum = 0
count = 1
for i in range(num):
    if count % 2 == 0:
        sum = sum - count/(2*count - 1)
    else:
        sum = sum + count/(2*count - 1)
    count = count + 1
print(format(sum,'.3f'))

第2章-7 产生每位数字相同的n位数

A,B = map(int,input().split("，"))
A = str(A)
A = A*B
print(int(A))

第2章-8 转换函数使用

a,b = map(int,input().split(","))
if b == 2:
    res = int(str(a),2)
elif b == 8:
    res = int(str(a),8)
elif b == 16:
    res = int(str(a),16)
print(res)

第2章-9 比较大小

a,b,c = map(int,input().split(" "))
list = [a,b,c]
list.sort()
print(list[0],"->",list[1],"->",list[2],sep = "")

第2章-10 输出华氏-摄氏温度转换表

lower,higher = map(int,input().split(" "))
if lower <= higher and lower <= 100 and higher <= 100:
    print("fahr celsius")
    i = lower
    while i <= higher:
        c = 5*(i - 32)/9
        print(i,format(c,'>6.1f'))
        i = i + 2
else:
    print("Invalid.")

第2章-11 求平方与倒数序列的部分和

m,n = map(int,input().split(" "))
sum = 0
start = m
end = n
while start <= end:
    sum = sum + 1/start + pow(start,2)
    start = start + 1
print("sum = ",format(sum,".6f"))

第2章-12 输出三角形面积和周长

a,b,c = map(int,input().split(" "))
s = (a + b + c)/2
if a + b > c and a + c > b and b + c > a:
    area = pow(s * (s - a) * (s - b) * (s - c),1/2)
    perimeter = a + b + c
    print("area = ",format(area,".2f"),"；perimeter = ",format(perimeter,".2f"),sep = "")
else:
    print("These sides do not correspond to a valid triangle")

第2章-13 分段计算居民水费

water_consumption = eval(input())
if water_consumption <= 15:
    cost = (4*water_consumption)/3
    print(format(cost,".2f"))
else:
    cost = 2.5 * water_consumption - 17.5
    print(format(cost,".2f"))

第2章-14 求整数段和

a,b = map(int,input().split(" "))
sum = 0
count = 0
for i in range(a,b + 1):
    print(format(i,">5"),end = "")
    count = count + 1
    sum = sum + i
    if count % 5 == 0:
        print("\n")
if count % 5 == 0:
    print("Sum = ",sum)
else:
    print("\n")
    print("Sum = ",sum)