《Python核心编程》 第八章 条件和循环

8–1.条件语句. 请看下边的代码
# statement A
if x > 0:
# statement B
pass
elif x < 0:
# statement C
pass
else:
# statement D
pass
# statement E
(a)如果 x< 0 , 上面哪个语句(A, B, C, D, E)将被执行
(b)如果 x== 0 , 上面哪个居于将被执行?
(c)如果 x> 0 , 上面哪个语句将被执行?

答：

a: A,C,E

b: A,D,E

c: A,B,E

为步长, 从 f 计数到 t , 包括 f 和 t . 例如, 如果输入的是 f == 2, t == 26, i == 4 , 程序
将输出 2, 6, 10, 14, 18, 22, 26.

答：

f = input("From:")
t = input("To:")
i = input("increament:")
for x in range(f,t+1,i):
    print x

if __name__ == "__main__":
    pass

(之前用while写的，死机了，好忧伤)

追上while的写法：

f = input("From:")
t = input("To:")
i = input("increament:")

if __name__ == "__main__":
    pass
while f<=t:
    print f
    f+=i

答：

(a) range(0,10)

(b)range(3,19,3)

(c)range(-20,860+(正整数)，220)

 答：

def isprime(num):
    count = num/2
    while count>1:
        if num%count == 0:
            return False
            break
        else:
              return True  

if __name__ == "__main__":
    num = int(input("请输入一个数字："))
    print isprime(num)

答：（没有用列表展示）

def getfactors(num):
    for i in xrange(1,num+1):
        if num%i==0:
            print i

if __name__ == "__main__":
    num = int(input("PLS input a number:"))
    print getfactors(num)

答：

def isperfect(num):
    sum = 0
    count = num/2
    while count>0:
        for i in range (1,count+1):
            if num % i == 0:
                sum+=i
            count-=1
    if sum == num:
        return True
    else:
        return False

if __name__ == "__main__":
    num = int (input("number:"))
    print isperfect(num)

 答：

def jiecheng(num):
    sum = 1
    for i in range(1,num+1):
        sum*=i
    return sum

if __name__ == "__main__":
    num = int (input("number:"))
    print jiecheng(num)

 答：

def Fibonacci(num):
    if num ==1:
        return [1]
    if num == 2:
        return [1,1]
    list = [1,1]
    if num >2:
        for i in range(3,num+1):
            list.append((list[-1]+list[-2]))
        return list

if __name__ == "__main__":
    num = int (input("Pls input a number:"))
    print Fibonacci(num)

答：暂不处理

答：

# -*- coding: UTF-8 -*-
‘‘‘
Created on 2014年8月14日

@author: User
‘‘‘
total = int (input("Enter total number of names: "))
ls = []
for i in range(total):
    prompt = ‘Please enter the %dth name:‘ %(i+1)
    s = raw_input(prompt)
    count = 0
    if s.count(",") == 0:
        s = raw_input("Wrong format... should be Last, First. Try again:")
        count+=1
        print "You have done this %d time(s) already." %count
    ls.append(s.split(","))

ls.sort( lambda x,y : cmp(x[0],y[0]))
print ‘The sorted list (by last name) is:‘
for name in ls:
    print ‘%s , %s ‘  %(name[0],name[1])

if __name__ == "__main__":
    pass

《Python核心编程》 第八章 条件和循环