creditsLeft=信用等级信用等级

Question

当我尝试运行它时，它会出现一条creditsLeft = creditsDegree - creditsTaken的错误消息。说

unsupported operand type(s) for -: 'str' and 'str'

studentName = input('Enter student name. ')
degreeName = input('Enter degree name. ')
creditsDegree = input('Enter the number of credits required for degree. ')
creditsTaken = input('Enter credits taken so far. ')
creditsLeft = creditsDegree - creditsTaken 
print ('The student\'s name is'), studentName 
print ('The degree name is'), degreeName`enter code here`
print ('There are'), creditsLeft, ('credits left until graduation.')

Answer 1

恰好只包含数字的字符串，如“54”，与数字54不同。您需要转换，比如：int（“54”）或int（creditsDegree）。你知道吗