TypeError：并非所有参数都在字符串格式化期间转换（Python Typeerror）

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如何解决TypeError：并非所有参数都在字符串格式化期间转换（Python Typeerror）？

我有一个基本的 Python 脚本：

first_number = float(input("what is your first number?"))
#Ask the user what the first number is before calculation.
second_number = float(input("what is your second number?"))
#Ask the user the second number.
cal = str(input("Do you want to add,subtract,multiply,or divIDe? You can also 
square,or calculate with each option."))
if cal == "add":
 print("Done! The result is" % first_number + second_number)
 #checks if the user wants to add,then adds if so. Then prints the final number.
if cal == "subtract":
 print("Done! The result is" % first_number + second_number)
 #divIDes and prints.
if cal == "multiply":
 print("Done the result is" % first_number * second_number)
 #MultiplIEs
if cal == "square":
 print("Done! The result is" % first_number * second_number)
if cal == "divIDe":
 print("Done! The result is" % first_number / second_number)
 remainder = str(input("Assuming you kNow the original number,would you like to see 
 the Integer remainder? (y/n)"))
 if remainder == "y":
  print("Here you go. The result is" % first_number % second_number)

在第 21 行，它有一个奇怪的字符串格式错误。我试图将引号中的 str 与余数数学运算结合起来（使用模运算符），但它出现了这个奇怪的错误：TypeError: not all arguments converted during String formatTing

解决方法

first_number = float(input("what is your first number?"))
# Ask the user what the first number is before calculation.
second_number = float(input("what is your second number?"))
# Ask the user the second number.
cal = input("Do you want to add,subtract,multiply,or divide? You can also square,or calculate with each option.")
if cal == "add":
    print(f"Done! The result is {first_number + second_number}")
    # checks if the user wants to add,then adds if so. Then prints the final number.
if cal == "subtract": # you were adding instead of substracTing here
    print(f"Done! The result is {first_number - second_number}") 
    # Divides and prints.
if cal == "multiply":
    print(f"Done the result is {first_number * second_number}")
    # Multiplies
if cal == "square":
    print(f"Done! The result is {first_number * second_number}")
if cal == "divide":
    print(f"Done! The result is {first_number / second_number}")
    remainder = input("Assuming you know the original number,would you like to see the Integer remainder? (y/n)")
    if remainder == "y":
        print(f"Here you go. The result is {first_number % second_number}")

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