某公司第5題

 

忘了題目是什麼了，有時間逆推一下。

# method 3
ll="1234567890 "
ls='abcdefghijklmnopqrstuvwxyz'




# method 2
i = 0
def solve(arr):
ans = []
for i in xrange(len(arr)):
if i % 2 == 0:
ans.append(arr[i])
i += 1
return ''.join(ans)ls



print solve(ll)
print solve(ls)


# method 2
def solve2(arr):
return ''.join([arr[v] for v in xrange(0,len(v)) if v % 2 ==0])
print solve(ll)
print solve(ls)




# method 3
print ''.join([v for k,v in enumerate(ll) if k % 2 == 0])
print ''.join([v for k,v in enumerate(ls) if k % 2 == 0])