def find_even_len_palindromes(plist):
"""
returns a list of all the pallindromes of
plist, which have an even number of digits
>>> find_even_len_palindromes(palindromic_squares(1000000000)) == [698896]
True
>>>
"""
even_len_list = []
for i in plist:
if not len(str(i)) % 2:
even_len_list .append(i)
return even_len_list
if __name__ == "__main__":
doctest.testmod()