a quickie: range - x

[rjtucke]

I want an iterable from 0 to N except for element m (<=M).
I could write
x = range(N)
x.remove(m)
but I want it in one expression.

Thanks,
Ross

 

[johnzenger]

(x for x in xrange(N+1) if x != m)

 

[Paul Rubin]

I want an iterable from 0 to N except for element m (<=M).
I could write
x = range(N)
x.remove(m)
but I want it in one expression.

itertools.chain(xrange(0,m), xrange(m+1, N))

 

[Steven D'Aprano]

I want an iterable from 0 to N except for element m (<=M).
I could write
x = range(N)
x.remove(m)
but I want it in one expression.

Because the world will end if you can't?

What's wrong with the solution you already have? If you need to use it
many times, make it a function. Calling the function is always a one-liner.

Here's another solution:

x = [i for i in range(N) if i != m]

Here's another:

x = range(m-1) + range(m+1, N)

Here's a generator to do it:

def range_except(N, m):
"""Iterator that returns ints from 0 through N-1 except for m."""
for i in xrange(N):
if i != m:
yield i

 

[rjtucke]

Thanks, all- that helped.
Ross

 

[Kent Johnson]

x = range(m-1) + range(m+1, N)

Should be range(m) + range(m+1, N)

Kent