尝试返回布尔值时的TypeError（“ bool”对象不可迭代”） [英] TypeError("'bool' object is not iterable",) when trying to return a Boolean

问题描述

我遇到一个奇怪的问题。我有一个返回布尔值的方法。反过来，我需要再次返回该函数的结果，因为我无法直接从前端调用该方法。这是我的代码：

I am having a strange problem. I have a method that returns a boolean. In turn I need the result of that function returned again since I cant directly call the method from the front-end. Here's my code:

# this uses bottle py framework and should return a value to the html front-end
@get('/create/additive/<name>')
def createAdditive(name):
    return pump.createAdditive(name)



 def createAdditive(self, name):
        additiveInsertQuery = """ INSERT INTO additives
                                  SET         name = '""" + name + """'"""
        try:
            self.cursor.execute(additiveInsertQuery)
            self.db.commit()
            return True
        except:
            self.db.rollback()
            return False

这将引发异常：TypeError（'bool'对象不可迭代，）

This throws an exception: TypeError("'bool' object is not iterable",)

我根本没有收到此错误，因为我不是试图迭代布尔值，而只是返回它。

I don't get this error at all since I am not attempting to "iterate" the bool value, only to return it.

如果我返回的是字符串而不是布尔值或整数，则它将按预期工作。

If I return a string instead of boolean or int it works as expected. What could be an issue here?

跟踪：

Traceback (most recent call last):
  File "C:\Python33\lib\site-packages\bottle.py", line 821, in _cast
    out = iter(out)
TypeError: 'bool' object is not iterable

推荐答案

回溯：

Traceback (most recent call last):
  File "C:\Python33\lib\site-packages\bottle.py", line 821, in _cast
    out = iter(out)
TypeError: 'bool' object is not iterable

您的代码没有迭代该值，但是接收到它的代码。

Your code isn't iterating the value, but the code receiving it is.

解决方案是：返回一个可迭代的。我建议您将布尔值转换为字符串（ str（False））或将其包含在元组中（（False，））。

The solution is: return an iterable. I suggest that you either convert the bool to a string (str(False)) or enclose it in a tuple ((False,)).

始终阅读回溯：正确，而且很有帮助。

Always read the traceback: it's correct, and it's helpful.

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