Python3.8.3：将输入字符串转换为整数结果转换为ValueError

Question

代码：

SELECT student.id, book.id, study_group.id
FROM student
    INNER JOIN study_group on (student.id = study_group.student_id)
    INNER JOIN borrowed on (study_group.id = borrowed.group_id)
    INNER JOIN book on (borrowed.book_id = book.id)
WHERE student.id == 1

错误：

ValueError：以10为底的int（）无效文字

我只是实现ATBS书中的代码状态。我做错了什么？思想和帮助将不胜感激

Answer 1

您的实现是正确的。这个对我有用。您可以在这里检查它：Online check

age = int(input('How old are you? '))
print(type(age))

# output

How old are you? 20
<class 'int'>