Re: Dictionaries

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From	John Gordon <gordon@panix.com>
Newsgroups	comp.lang.python
Subject	Re: Dictionaries
Date	Thu, 20 Mar 2014 14:19:50 +0000 (UTC)
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In <mailman.8300.1395322251.18130.python-list@python.org> ishish <ishish@domhain.de> writes:

> The script [...] only creates batch1.csv.

If the script only creates batch1.csv, that means Batch2 and Batch3 must
be empty.

> for k, v in myDict.items():
> 	if Batch1.has_key(k):
> 		if k in Batch2.has_key(k):
> 			Batch3[k] = v
> 		else:
> 			Batch2[k] = v
> 	else:
> 		Batch1[k] = v

'if k in Batch2.has_key(k):' is a very strange line of code.  In fact, it
should produce a syntax error if it were ever executed, because the 'in'
keyword requires an iterable as the second part, and has_key() returns
only True or False.

Therefore, I would say that line of code never executes, which means
that the preceding 'if Batch1.has_key(k)' statement always evaluates
to False.

Which therefore means that Batch2 and Batch3 never accumulate any items,
matching your observed output.

-- 
John Gordon         Imagine what it must be like for a real medical doctor to
gordon@panix.com    watch 'House', or a real serial killer to watch 'Dexter'.

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Dictionaries ishish <ishish@domhain.de> - 2014-03-20 13:11 +0000
  Re: Dictionaries John Gordon <gordon@panix.com> - 2014-03-20 14:19 +0000

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