output 출력 할 때 리스트를 적당히 다듬어서 출력할 일이 종종 있다. 계속 까먹어서 적어둠.

num_list = [-1, 0, 1, 3, 4, 5, 9]

print(num_list)
# [-1, 0, 1, 3, 4, 5, 9]
print(" ".join(map(str, num_list)))
# -1 0 1 3 4 5 9

# print(" ".join(num_list))
# TypeError: sequence item 0: expected str instance, int found

python 3.6.1 문서를 참고.

• str.join(iterable)
  Return a string which is the concatenation of the strings in the iterable iterable. A TypeError will be raised if there are any non-string values in iterable, including bytes objects. The separator between elements is the string providing this method.