9. 11.The number of end 0

   def count(num,i):
       if num==0:
           return 0
       if num%i==0:
           return 1+count(num/i,i)
       else:
           return 0
   
   def countzero(list):
       count2=0
       count5=0
       for i in range(len(list)):
           count2 += count(list[i], 2)
           count5 += count(list[i], 5)
   
       if count2>count5:
           return count5 ...

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10. 10.lowest common multiple (lcm)

    a=10
    b=24
    def fun(a,b):
        for i in range(max(a,b),a*b+1):
            if i%a==0 and i%b==0:
                n=i
                break
        return n
    print (fun(a,b))
    

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11. 9.greatest common divisor(gcd)

    a=10
    b=24
    def fun(a,b):
        for i in range(1,min(a,b)+1):
            if a%i==0 and b%i==0:
                n=i
        return n
    print (fun(a,b))
    

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12. 8.the median

    L=[0,1,4,2,3,4]
    L.sort()
    if len(L)%2==1:
        print L[len(L)//2]
    else:
        print (L[len(L)/2]+L[len(L)/2-1])/2.0
    

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13. 7.For the rectangular area

    print a*b,2*(a+b)
    

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14. 6.To solve all the prime Numbers within 100

    primes = []
    for i in range(2, 101):
        for t in range(2, i):
            if i % t == 0:
                break
        else:
            primes.append(i)
    print primes
    print ' '.join(map(str, primes))
    

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15. 5.The output characters of the odd location of the string

    # method 1
    a= "12345"
    print "".join([a[i] for i in range(len(a)) if i%2==0])
    
    print ( ''.join([ c for i, c in enumerate(a) if i % 2 == 0]) )  # i is list[0, 1, 2, 3, 4], c is ['1', '2', '3', '4', '5']
    print ( ''.join([ str(i ...

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16. 4.Output the dictionary keys

    a={1:1,2:2,3:3}
    
    # method 1
    print ",".join([str(i) for i in a.keys()])    # attention! join string! a.keys() is a list
    
    # method 2
    print ",".join(map(str, a.keys()))   # map(func, list)
    

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17. 3.Reverse a string

    a="12345"
    
    # method 1
    print(a[::-1])
    
    # method 2
    from functools import reduce
    print reduce((lambda x, y: y+x), a)   # reduce is [ func(func(s1, s2),s3), ... , sn ]
    
    # method 3
    print "".join(reversed(a))     # reversed(object) return a iterator, type 'reversed', join(iterable)
    

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18. 2.Sort the list

    L=[2,8,5,3]
    
    L.sort()
    print L
    
    new_list = sorted(L)
    print new_list
    

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