All solutions were successfully tested on 16 April 2013.

**first_last6:**

def first_last6(nums): return nums[0] == 6 or nums[-1] == 6

**same_first_last:**

def same_first_last(nums): return len(nums) >= 1 and nums[0] == nums[-1]

**make_pi:**

def make_pi(): return [3, 1, 4]

**common_end:**

def common_end(a, b): return a[0] == b[0] or a[-1] == b[-1]

**sum3:**

def sum3(nums): #return nums[0] + nums[1] + nums[2] return sum(nums)

Either way works. The version I’ve commented out is less elegant, though.

**rotate_left3:**

def rotate_left3(nums): return [nums[1], nums[2], nums[0]]

**reverse3:**

def reverse3(nums): #return [nums[2], nums[1], nums[0]] return nums[::-1]

Again, the second version is more elegant or, as some phrase it, more “pythonic”.

**max_end3:**

def max_end3(nums): m = max(nums[0], nums[2]) return [m, m, m]

For matters of comparison, here is the solution from the website:

def max_end3(nums): big = max(nums[0], nums[2]) nums[0] = big nums[1] = big nums[2] = big return nums

It is less expressive and, frankly, a bit painful to look at. A much nicer way to assign “big” to three variables at once would be one of the two following ways:

def max_end3(nums): big = max(nums[0], nums[2]) #nums[0], nums[1], nums[2] = big, big, big nums[0], nums[1], nums[2] = (big, ) * 3 return nums

**sum2:**

def sum2(nums): if len(nums) == 0: return 0 if len(nums) == 1: return nums[0] return nums[0] + nums[1]

**middle_way:**

def middle_way(a, b): return [a[1], b[1]]

**make_ends:**

def make_ends(nums): return [nums[0], nums[-1]]

**has23:**

def has23(nums): return 2 in nums or 3 in nums

Do you remember what this looked like in Java?

Hong Jeonpythony solution to sum2:

def sum2(nums):

return sum(nums[:2])

takes care of all cases, no?

rosathis guide is missing has23

Gregor UlmPost authorYou’re mistaken.

rosano you have has22 for list2 but not has23 for list1

Gregor UlmPost authorIt’s at the very end of this post.

Pszemosum2 cleaner solution:

def sum2(nums):

if len(nums) > 2:

return sum(nums[:2])

return sum(nums)

GudI know my code is a silly one – but why is it wrong for has23([4, 5]) (gives True???)

def has23(nums):

if nums[0] or nums[1]== 2 or 3:

return True

else:

return False

Gregor UlmPost authorLook up how ‘or’ works. What is “bool(2 or 3)” in Python?

Abdulmake_pi(nums):

if nums[0] == 3 and nums[1] == 1 and nums[2] == 4:

return True

else:

return False

make_pi([3,1,4])