Embedded For Loop With No Data

[rshepard]

Haven't found an answer to my question in the books and other docs I have
available, so I am asking here.

I have three lists of data retrieved from database tables. I want to cycle
through all three lists using nested FOR loops. What is the behavior if
there are no data in the list used in the middle loop?

Example:

for a in types:
for b in subtypes:
for c in details:
do some processing

Not every item in the 'types' list will have an associated 'subtype'. Does
the index ignore that loop and drop to the one nested beneath it?

Rich

[Steven D'Aprano]

On Thu, 05 Jul 2007 22:03:59 +0000, rshepard wrote:

Haven't found an answer to my question in the books and other docs I have
available, so I am asking here.

I have three lists of data retrieved from database tables. I want to cycle
through all three lists using nested FOR loops. What is the behavior if
there are no data in the list used in the middle loop?

Why don't you try it and see for yourself?
types = ["Type A", "Type B", "Type C"]
subtypes = []
details = [1, 2, 3]

Example:

for a in types:
for b in subtypes:
for c in details:
do some processing

Not every item in the 'types' list will have an associated 'subtype'. Does
the index ignore that loop and drop to the one nested beneath it?

Be sure to write back and let us know what you discover.
--
Steven.