有人能帮我弄清楚我的代码是这样打印变量的吗

Question

我刚开始学习python，我需要打印出我的变量，但它以一种奇怪的方式打印它

namesANDgrade = ""

while studentname == 'y':
  NumberOfStudents += 1
  print("Enter student#",NumberOfStudents,"name")
  name = input()
  namesANDgrade = str(namesANDgrade) + '\n'+str(NumberOfStudents)+":"+str(name)
  print("What is",name+'s grade in the class: ')
  grade = input()

  namesANDgrade = str(namesANDgrade),str(grade)+"%"

print(namesANDgrade)

詹姆斯·凯伦和数字被输入

打印namesANDgrade时，它显示为：

("('\\n1:James ', '90%')\n2:Karen", '50%')

I expect it to be:

1:James 90%

2:Karen 50%

Answer 1

在namesANDgrade = str(namesANDgrade),str(grade)+"%"中使用逗号（,）将namesAndgrade设置为两个项目的元组：一个字符串版本的本身，然后是由等级和%组成的字符串

相反，只需使用plus进行字符串连接。此外，这些str调用中有很多是冗余的，因为input的返回值是字符串，字符串连接会生成字符串：

namesANDgrade = ""

while studentname == 'y': # this looks like an infinite loop but it's in the question 
  NumberOfStudents += 1
  print("Enter student#",NumberOfStudents,"name")
  name = input()
  namesANDgrade = namesANDgrade + '\n' + str(NumberOfStudents) + ":" + name
  print("What is " + name + "'s grade in the class: ")
  grade = input()

  namesANDgrade = namesANDgrade + grade + "%"

print(namesANDgrade)