法一：
list_a = [1, 2, 3]
str_b = 'aaa'
string = "There are two contents：%s, %s" % (list_a, str_b)
print(string)
# 輸出：
# There are two contents：[1, 2, 3], aaa
法二：
list_a = [1, 2, 3]
str_b = 'aaa'
string = "There are two contents：{}, {}".format(list_a, str_b) # {}默認為輸出對應變量的全部內容
print(string)
# 輸出：
# There are two contents：[1, 2, 3], aaa
# 若變量為列表等可以通過索引取值的數據，可以在花括號里面加入索引
string = "There are two contents：{[2]}, {}".format(list_a, str_b)
print(string)
# 輸出：
# There are two contents：3, aaa
# 可以看出，此時list_a輸出的是索引2位置的數據
法三：
list_a = [1, 2, 3]
str_b = 'ccc'
string = f"There are two contents：{list_a}, {str_b}"
print(string)
# 輸出：
# There are two contents：[1, 2, 3], ccc
