integer >= 1 == True and integer.0 == False is bad, bad, bad!!!

[Steven D'Aprano]

On Mon, 12 Jul 2010 20:22:39 -0700, Paul Rubin wrote:

> Steven D'Aprano <steve-REMOVE-THIS at cybersource.com.au> writes:
>> Writing the  explicit tests:
>> if bool(myInt):
>> or even:
>> if myInt <> 0:
>>
>> are firmly in the same category. The only difference is that it is more
>> familiar and therefore comfortable to those who are used to languages
>> that don't have Python's truth-testing rules.
> 
> It's like list.append returning None.  It helps catch errors.

How?

>>> myInt = 'x'
>>> if myInt <> 0:
...     print "myInt is not zero, safe to divide"
...     print 42/myInt
...
myInt is not zero, safe to divide
Traceback (most recent call last):
  File "<stdin>", line 3, in <module>
TypeError: unsupported operand type(s) for /: 'int' and 'str'



What error did this catch?


-- 
Steven