怎么输出字典所有的键（不带前缀的)

Question

如题

a = {"键1":"值1",
     "键2":"值2",
     "键3":"值3"}
print(a.keys())
#输出的结果为dict_keys(['键1', '键2', '键3'])，怎么去掉dict_keys([])

Answer 1

a = {"键1":"值1",
     "键2":"值2",
     "键3":"值3"}

print(' '.join(a.keys()))