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Home/ Questions/What is the typeerror: 'bool' object is not iterable problem, and how to solve it?
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Finley Miller
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Finley Miller
Asked: May 18, 20222022-05-18T17:59:23+00:00 2022-05-18T17:59:23+00:00In: python

What is the typeerror: ‘bool’ object is not iterable problem, and how to solve it?

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As advised, I used some code samples in another forum, but it could not improve the problem. My question is the “typeerror: ‘bool’ object is not iterable” in python – How to solve it?

The command line is:

# 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

and the result:

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

What does the message mean? Can you advise me to fix it? If you have other better answers, leave them in the answer box below.

typeerror
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    hdtutoria Expert
    2022-06-12T10:45:33+00:00Added an answer on June 12, 2022 at 10:45 am

    The cause: I think the cause of this error is your code isn’t iterating the value, but the code receiving it is. You can see that on the traceback:

    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

    The solution: To solve this problem, you should return an iterable. I recommend either converting the bool to a string (str(False)) or enclosing it in a tuple ((False,)).

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