[Tutor] Problems understanding control flow

[Eduardo Vieira]

On Thu, Jul 30, 2009 at 5:56 PM, Eduardo Vieira<eduardo.susan at gmail.com> wrote:
> On Thu, Jul 30, 2009 at 4:49 PM, Sander Sweers<sander.sweers at gmail.com> wrote:
>> 2009/7/30 Eduardo Vieira <eduardo.susan at gmail.com>:
>>
>> With == you are testing if the 2 values are exactly the same. So 'one'
>> == 'one' will return True but 'one; == 'one two' will return False.
>>
>> With in you test if the value is part of a another value. So using the
>> same value as above 'one' in 'one' will return True but 'one' in 'one
>> two' will also return True as 'one' is part of the second string.
>>
>> The same logic applies to lists and dicts. 'one' == ['one', 'two']
>> will return False as the the 2 values are not exactly the same but
>> 'one' in ['one', 'two'] will return True.
>>
>>> # this does not work:
>>> for row in sitelist:
>>>   for line in bvreaderone:
>>
>> If you are getting unexpected results add in print statements to see
>> what is the data that you are working with. I would add the below 2
>> print statements to see what you are now actually comparing. Same
>> applies to the other working example.
>> :
>>    print 'Value row['EMAIL'] is: %s' % row['EMAIL']
>>    print 'Value of line['BVADDREMAIL'] is: %s' % line['BVADDREMAIL']
>>
>>>       if row['EMAIL'] == line['BVADDREMAIL']:
>>
>> Here you are testing if the value of row['EMAIL'] is exactly the same
>> as line['BVADDREMAIL']: which is not the case so the test returns
>> False and the below print statement is not executed.
>>
>>>           print line['NAME'], row['COMPANY']
>>>
>>> # but this does work:
>>> for row in sitelist:
>>>   for line in bvreaderone:
>>>       if row['EMAIL'] in line['BVADDREMAIL']:
>>
>> Here you test if the value row['E_MAIL'] is part of
>> line['BVADDREMAIL']:which is True.
>>
>>>           print line['NAME'], row['COMPANY']
>>
>> Someone did a way better job writing this down some time a go but
>> can't find the post online. I hope you see now what the difference is
>> between the 2.
> Thanks for pointing out this, Sander. Yes, a print statement revealed
> the right after commas... In this case I should enable the option from
> the csv module to ignore such white spaces.
>
> Eduardo
>
I meant  a print statement revealed the extra space right after commas...