str_a = ":{}::{}:".format(10, 20) # "10 20"
print(str_a)
print(type(str_a))


# str_int_a = str(52)
# str_float_a = str(42.273)

# # 문자열: <값> <class 'str'>
# print(str_int_a, type(str_int_a))
# print(str_float_a, type(str_float_a))