Python程序语言设计教程赵璐【第二章】答案_python语言程序设计教程答案赵璐第二章例题

第二章

（1）

import math
from math import pi
from math import pow
math.sqrt(pow(pi , 2) + 3)
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(2)

math.log( 2 * pi * (13 + math.e) ) 
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(3)

math.pow(math.tan (math.log(3 , math.pi + 1)) , -1)
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(1)

print( "边长2.11的圆的体积：" ,pow( 2.11 , 2 ) * math.pi )
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(2)

pow(16.2 , 2) * pi - pow(9.4 , 2) * pi
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(3)

print("V = ",pow(66 , 2) * pi * 24.2)
print("S = " , pow(66 , 2) * pi  * 2 + 2 * pi * 66 * 24.2)
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x1 = input("x1: ") ; y1 = input("y1: "); x2 = input("x2: "); y2 = input("y2: ")
x1 = int(x1) ; y1 = int(y1) ; x2 = int(x2) ; y2 = int(y2)  
print("距离 : " , math.sqrt(pow(x1 - x2 , 2) + pow(y1 - y2 , 2)) )
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import re

str = "http://sports.sian.com.cn/"
q1 = 0
for i in str : 
    if i == 't' :
        q1 += 1
print("t出现次数: " , q1)
print("com 出现位置: " , str.find("com"))
X = str.replace("." , "-")
print (X)

# strname[start : end : step]
print("sian正向切片 : " , str[14:18:1])
print("strops反向切片 : ", str[-14:6:-1])
print(str.upper())
print(len(str))
s = str + "index"
print(s)
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a = input('语文成绩:')
b = input('数学成绩:')
c = input('英语成绩:')
a = int(a) ; b = int(b) ; c = int(c)
sum = a + b + c
avg = sum / 3
mx = max(a , b , c)
mi = min(a , b , c)
print("课程成绩综合为:" , sum)
print("平均成绩为:" , avg)
print("最高分:" , mx , " 最低分:" , mi)
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n = int(input("输入一个数:"))
sum_n = 0
while n != 0 :
    an = n % 10
    sum_n += an
    n = n // 10
print("数位和为: " , sum_n)
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