+ 不支持的操作数类型：“int”和“str”[重复]

Question

我目前正在学习 Python，所以我不知道发生了什么。

num1 = int(input("What is your first number? "))
num2 = int(input("What is your second number? "))
num3 = int(input("What is your third number? "))
numlist = [num1, num2, num3]
print(numlist)
print("Now I will remove the 3rd number")
print(numlist.pop(2) + " has been removed")
print("The list now looks like " + str(numlist))

当我运行程序时，输入 num1、num2 和 num3 的数字，它会返回： Traceback（最近一次调用最后一次）：

TypeError: unsupported operand type(s) for +: 'int' and 'str'

Answer 1

你试图连接一个字符串和一个整数，这是不正确的。

将print(numlist.pop(2)+" has been removed") 更改为以下任何一个：

将int 显式转换为str：

print(str(numlist.pop(2)) + " has been removed")

使用, 代替+：

print(numlist.pop(2), "has been removed")

字符串格式：

print("{} has been removed".format(numlist.pop(2)))

Answer 2

试试，

str_list = " ".join([str(ele) for ele in numlist])

此语句将以string 格式为您提供列表中的每个元素

print("The list now looks like [{0}]".format(str_list))

和，

将print(numlist.pop(2)+" has been removed") 更改为

print("{0} has been removed".format(numlist.pop(2)))

也是。