这个 python 打印语句的最后一行中我连接的错误是什么？

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如何解决这个 python 打印语句的最后一行中我连接的错误是什么？？

我在最后一行找不到错误。我是这门语言的完全初学者。提前致谢。

ingredIEnt_one = input("What is the first ingredIEnt?: ")
ing_one_oz = int(input("How many ounces of this ingredIEnt?: "))

ingredIEnt_two = input("What is the second ingredIEnt?: ")
ing_two_oz = int(input("How many ounces of this ingredIEnt?: "))

ingredIEnt_three = input("What is the third ingredIEnt?: ")
ing_three_oz = int(input("How many ounces of this ingredIEnt?: "))

servings_amt = int(input("How many servings would you like?: "))

ing_one_oz = ing_one_oz * servings_amt
ing_two_oz = ing_two_oz * servings_amt
ing_three_oz = ing_three_oz * servings_amt

print("In order to make " + str(servings_amt) + " servings of your recipe,you will need " + str(ing_one_oz) + " ounces of " /
+ str(ingredIEnt_one) + "," + str(ing_two_oz) + " ounces of " + str(ingredIEnt_two) + ",and " + str(ing_three_oz) /
+ " ounces of " + str(ingredIEnt_three))

我的输出为最后一行显示 TypeError: bad operand type for unary +: 'str'。

解决方法

ingredient_one = input("What is the first ingredient?: ")
ing_one_oz = int(input("How many ounces of this ingredient?: "))

ingredient_two = input("What is the second ingredient?: ")
ing_two_oz = int(input("How many ounces of this ingredient?: "))

ingredient_three = input("What is the third ingredient?: ")
ing_three_oz = int(input("How many ounces of this ingredient?: "))

servings_amt = int(input("How many servings would you like?: "))

ing_one_oz = ing_one_oz * servings_amt
ing_two_oz = ing_two_oz * servings_amt
ing_three_oz = ing_three_oz * servings_amt

print(
    f"In order to make {servings_amt} servings of your recipe,you will need {ing_one_oz} ounces of {ingredient_one},{ing_two_oz} ounces of {ingredient_two},{ing_three_oz} ounces of {ingredient_three}")

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