[093]python_ch8(條件、循環)-練習題

此解答因為限於排版，所以很多縮排是有誤的，得再去此網址深入查詢答案，

github正確排版答案

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ex8-1

(a) statement C

(b) statement D

(c) statement B

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ex8-2

from_value=int(input("(f)rom:"))

to_value=int(input("(t)o:"))

increment_value=int(input("(i)ncrement:"))

for num in range(from_value,to_value,increment_value):

print num

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ex8-3

print 'cList',cList

aList=[]

bList=[]

cList=[]

for i in range(10):

aList.append(i)

for i in range(3,19,3):

bList.append(i)

for i in range(-20,861,220):

cList.append(i)

print'aList',aList

print'bList',bList

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ex8-4

def isprime(num):

count=num/2

while count>1:

if num%count==0:

return True

break

count-=1

else:

returnFalse

for i in range(100,200):

print i,isprime(i)

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ex8-5

def getfactors(num):

aList=[]

count=num/2

while count>1:

if num%count==0:

aList.append(count)

count-=1

count-=1

return sorted(aList)

for i in range(20,40):

print i,':',getfactors(i)

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ex8-6

if num%i==0:

#coding=utf-8

def get_prime_factors(num):

return[i for i in range(1, num+1) if num%i==0 and isprime(i)]

def isprime(num):

if num<=1:

return False

count=num/2

while count>1:

if num%count==0:

return False

count-=1

else:

returnTrue

def getfactors(num):

aList=[]

if isprime(num) or num<=1:

aList=[1,num]

return aList

factors=get_prime_factors(num)

while num not in factors:

for i in range(2,(num/2)+1):

num=num/i

aList.append(i)

break

else:

aList.append(num)

return aList

for i in range(1,30):

print getfactors(i)

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ex8-7

def get_factors_no_self(num):

return[i for i in range(1, num)if num%i==0]

def is_perfect(num):

if num==sum(get_factors_no_self(num)):

return1

else:

return0

fori in range(1,30):

print i,is_perfect(i)

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ex8-8

def getvalue(num):

count=num

total=1

while count>=1:

total=total*num

num=num-1

count-=1

returntotal

for i in range(1,11):

print i,getvalue(i)

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ex9-9

def fibibonacci(n):

if n==1 or n==2:

return1

else:

return fibibonacci(n-1)+fibibonacci(n-2)

for i in range(1,100):

printi,fibibonacci(i)

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ex8-10

#coding=utf-8

vowels='aeiou'

cosonants='bcdfghjklmnpqrstvwxyz'

def stat(sentence):

word_num=len(sentence.lower().strip().split(""))

vowels_num=0

cosonants_num=0

for c in sentence:

if c in vowels:

vowels_num+=1

elif c in cosonants:

cosonants_num+=1

else:

pass

return(word_num,vowels_num,cosonants_num)

def main():

sentence='Hello i am Bryan iiiI!'

print sentence

print"There are %d words,%d vowels and %d consonants."%stat(sentence)

if__name__=='__main__':

main()