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

Question

我一直在处理一个项目并收到以下错误：TypeError: unsupported operand type(s) for +: 'int' and 'str'.。任何帮助都会非常有用 appreciated.If 你也可以帮助缩短它，这将是一个奖励。另外，如果您可以分配某些键来只读取某些代码，那也很棒。例如，如果我单击 1，那么它将只读取从最高到最低顺序的#Printing The 数字，反之亦然。每个部分依此类推。谢谢！ :P

这是我的代码：

代码。

#Printing the Numbers in Highest to Lowest Order and vice versa.

Num1 = input("Enter a Score (Student 1)? ")
print ("The first Score is " + Num1)

Num2 = input("Enter a Score (Student 2)? ")
print ("The Second Score is " + Num2)

Num3 = input("Enter a Score (Student 3)? ")
print ("The Third Score is " + Num3)


my_list = [Num1, Num2, Num3]
print("This is the order from Lowest to Highest")

my_list.sort()

for i in range(len(my_list)):
    print(my_list[i])

print("This is the order from Highest to Lowest")

my_list.sort(reverse=True)

for i in range(len(my_list)):
    print(my_list[i])

print("\n")
print("\n")

#Printing The average of the results for each student.

Student1 = input("Enter a Score (Student 1)? ")
print ("The First Score is " + Student1)
Student2 = input("Enter a another Score (Student 1)? ")
print ("The Second Score is " + Student1)
Student3 = input("Enter a final Score (Student 1)? ")
print ("The Final Score is " + Student3)

Student4 = input("Enter a Score (Student 2)? ")
print ("The First Score is " + Student4)
Student5 = input("Enter a second Score (Student 2)? ")
print ("The Second Score is " + Student5)
Student6 = input("Enter a finalScore (Student 2)? ")
print ("The final Score is " + Student6)



print("This is the average of student 1:")
print (sum(Student1 +Student2 + Student3) / float(len(Student1)))

print("This is the average of student 2:")
print (sum(Student2) / float(len(Student2)))

print("This is the average of student 3:")
print (sum(Student3) / float(len(Student3)))

#Printing the names alphabetically.

Name1 = input("Enter a name (Student 1)? ")
print ("The first name is " + Name1)

Name2 = input("Enter a name (Student 2)? ")
print ("The Second name is " + Name2)

Name3 = input("Enter a name (Student 3)? ")
print ("The Third name is " + Name3)

mylist = [Name1, Name2, Name3]
mylist.sort()

for x in sorted(mylist):
    print (x)

Answer 1

input函数会给你一个数字，如果你输入一个：

>>> type(input())
3
<type 'int'>
>>> type(input())
3.3
<type 'float'>

您要向某人索取分数，因此大概他们正在输入某种数字。如果您随后执行 print('The score is ' + Num1)，则您试图将字符串 'The score is ' 与 Num1 引用的整数连接起来。 + 运算符了解如何处理两个数字（加法）或两个字符串（连接），但不知道如何处理字符串和数字。

Answer 2

问题是您试图将字符串消息与您在输入中引入的 int 值连接起来。

尝试打印转换为字符串输入的消息，如下所示：

打印 ("The First Score is " + str(Student1))

Answer 3

根据python 3试试这个。这只是为了修复错误。我不知道你期望的输出是什么

print("This is the average of student 1:")
print (sum([int(Student1) +int(Student2) + int(Student3)]) / float(len(Student1)))

print("This is the average of student 2:")
print (sum([int(Student2)]) / float(len(Student2)))

print("This is the average of student 3:")
print (sum([int(Student3)]) / float(len(Student3)))

Answer 4

在 Pyhton.

例如：

print('This is ' + 20)   # "String + Number" is not allowed
print('This is ' + True) # "String + Boolean" is not allowed
print('This is ' + [])   # "String + List" is not allowed

但是如果使用 "str()" 将不同类型转换为 String，则可以进行连接：

print('This is ' + str(20))   # This is 20
print('This is ' + str(True)) # This is True
print('This is ' + str([]))   # This is []

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

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

python

python-3.x

string

concatenation

typeerror

代码。