无法连接 str 和 float [重复]

Question

当我打印时，它说我不能连接 float 和 str。我该如何解决这个问题？

shape = input("你想选择什么形状：圆形？三角形？矩形？还是五边形？") 饼图 = 浮点数（3.141592）

如果形状 == “圆”：

radius = float(input("what is the radius of the circle?"))

area = pie * (radius * radius)

perimeter = radius * pie * 2

print("the area of this circle is " + area)

print(" the  circumference of this circle is: " + perimeter)

elif 形状 == “三角形”：

side_1 = float(input("input the value of one of the sides"))

side_2 = float(input("input the value of one of the sides"))

base = float(input("what is the base? "))

tri_perimeter = side_1 + side_2 

print("the perimeter of this triangle is " + tri_perimeter)

height = float(input("what is the height? "))

tri_area = (base * height)/2

print("the area of the triangle is " + tri_area)

elif shape == "矩形":

base = float(input("what is the base? "))

height = float(input("what is the height? "))

rec_area = base * height

rec_perimeter = (base * 2) + (height * 2)

print("the area of the rectangle is " + rec_area)

print("the perimeter is " + rec_perimeter)

其他： 打印（“错误！”）

我真正苦苦挣扎的部分是当我想打印一些东西（9 区域或周长）时。它说我不能连接 str 和 float。我该如何解决？

Answer 1

你必须在连接之前把它变成一个字符串