Loops/Wrong ranges

Loops/Wrong ranges is a draft programming task. It is not yet considered ready to be promoted as a complete task, for reasons that should be found in its talk page.

Some languages have syntax or function(s) to generate a range of numeric values from a start value, a stop value, and an increment.

The purpose of this task is to select the range syntax/function that would generate at least two increasing numbers when given a stop value more than the start value and a positive increment of less than half the difference. You are than to use that same syntax/function but with different parameters; and show, here, what would happen.

Use these values if possible:

start	stop	increment	Comment
-2	2	1	Normal
-2	2	0	Zero increment
-2	2	-1	Increments away from stop value
-2	2	10	First increment is beyond stop value
2	-2	1	Start more than stop: positive increment
2	2	1	Start equal stop: positive increment
2	2	-1	Start equal stop: negative increment
2	2	0	Start equal stop: zero increment
0	0	0	Start equal stop equal zero: zero increment

Python

Python has the range function. <lang python>import re from itertools import islice # To limit execution if it would generate huge values

1. list(islice('ABCDEFG', 2)) --> ['A', 'B']
2. list(islice('ABCDEFG', 4)) --> ['A', 'B', 'C', 'D']

data = start stop increment Comment -2 2 1 Normal -2 2 0 Zero increment -2 2 -1 Increments away from stop value -2 2 10 First increment is beyond stop value 2 -2 1 Start more than stop: positive increment 2 2 1 Start equal stop: positive increment 2 2 -1 Start equal stop: negative increment 2 2 0 Start equal stop: zero increment 0 0 0 Start equal stop equal zero: zero increment

table = [re.split(r'\s\s+', line.strip()) for line in data.strip().split('\n')]

1. %%

for _start, _stop, _increment, comment in table[1:]:

   start, stop, increment = [int(x) for x in (_start, _stop, _increment)]
   print(f'{comment.upper()}:\n  range({start}, {stop}, {increment})')
   error, values = None, None
   try: 
       values = list(islice(range(start, stop, increment), 999))
   except ValueError as e:
       error = e
       print('  !!ERROR!!', e)
   if values is not None:
       if len(values) < 22:
           print('    =', values)
       else:
           print('    =', str(values[:22])[:-1], '...')

</lang>

Output:

NORMAL:
  range(-2, 2, 1)
    = [-2, -1, 0, 1]
ZERO INCREMENT:
  range(-2, 2, 0)
  !!ERROR!! range() arg 3 must not be zero
INCREMENTS AWAY FROM STOP VALUE:
  range(-2, 2, -1)
    = []
FIRST INCREMENT IS BEYOND STOP VALUE:
  range(-2, 2, 10)
    = [-2]
START MORE THAN STOP: POSITIVE INCREMENT:
  range(2, -2, 1)
    = []
START EQUAL STOP: POSITIVE INCREMENT:
  range(2, 2, 1)
    = []
START EQUAL STOP: NEGATIVE INCREMENT:
  range(2, 2, -1)
    = []
START EQUAL STOP: ZERO INCREMENT:
  range(2, 2, 0)
  !!ERROR!! range() arg 3 must not be zero
START EQUAL STOP EQUAL ZERO: ZERO INCREMENT:
  range(0, 0, 0)
  !!ERROR!! range() arg 3 must not be zero