CODEWITHSUNDEEP
pythonlistindexingfor-loop
Jake
Jake

Reputation: 283

Python: incorporating index from for loop as part of a list name

How does one generate a set of lists that incorporate the index from a for loop in the list name:

for j in range(10):
   li"j" = []

How can the index 'j' be part of the name, so the lists are li0, li1, li2, ...

Thanks!

Upvotes: 2

Views: 8865

Answers (3)

poke
poke

Reputation: 387557

If you do this simply to initialize lists to use them later, you should instead use one multi-dimensional list or even better tuple to do this:

li = tuple( [] for i in range( 10 ) )
li[0].append( 'foo' )
li[5].append( 'bar' )

Upvotes: 3

RossFabricant
RossFabricant

Reputation: 12492

You can actually do this with exec, like so: 

exec ("li%s = []" % 4)

But don't do this. You almost certainly do not want dynamically named variables. Greg Hewgill's approach will probably solve your problem.

Upvotes: 0

Greg Hewgill
Greg Hewgill

Reputation: 992807

You can make li a dictionary:

li = {}
for j in range(10):
    li[j] = []

Upvotes: 11

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