9. 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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10. 7.For the rectangular area

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

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11. 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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12. 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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13. 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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14. 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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15. 2.Sort the list

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

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16. 9. Palindrome Number

    class Solution(object):
        def isPalindrome(self, x):
            """
            :type x: int
            :rtype: bool
            """
            y = str(x)
            if len(y)==1:
                return True
    
            else:
                pal=True
                i=0
    
                while i < len(y) and pal:
                    if y[i]==y[len(y)-1-i]:
                        i+=1
                    else:
                        pal=False
                return pal
    
    if __name__=="__main__ ...

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17. 8. String to Integer (atoi)

    class Solution(object):
        def myAtoi(self, str):
            """
            :type str: str
            :rtype: int
            """
            if len(str) == 0:
                return 0
            lst_str = list(str.strip())
            sign = 1
            digit = 1
            r_lst = []
            for i in lst_str:
                if i is '+':
                    sign *= 1
                if i is '-':
                    sign *= -1
                if i >= '0' and i <= '9':
                    r_lst.append(i ...

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18. 7. Reverse Intege

    class Solution(object):
        def reverse(self, x):
            """
            :type x: int
            :rtype: int
            """
            if abs(x)!=x:
                a=-1
            else:
                a=1
    
            x=abs(x)
            total=0
            while x>0:
                n=x%10
                total=total*10+n
                x=x//10
    
            return total*a
    if __name__ == "__main__":
        answer = Solution()
        print answer.reverse ...

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