simple-range

Weka-inspired index and range using human-readable 1-based indices and placeholders, e.g.: last, first-last, 1-10,12,20-last.

Available placeholders:

• first - the first index
• second - the second index
• third - the third index
• last_2 - the third to last index
• last_1 - the second to last index
• last - the last index

Installation

pip install simple_range

Functionality

• Index

  • The simple_range.Index class parses and interprets a single index.
  • The simple_range.index_value method is convenience method to immediately parse and return an index as int.

• Range

  • The simple_range.Range class parses and interprets ranges.
  • The simple_range.range_indices method is convenience method to immediately parse and return int indices.

Examples

The following code:

from simple_range import Range, range_indices

r = Range("1-3", maximum=10)
print(r, "-->", r.indices())
r = Range("first-last", maximum=10) 
print(r, "-->", r.indices(zero_based=False))
r = Range("first-3,11,14-14,30,last", maximum=40)
print(r, "-->", r.indices())
print(r, "-->", r.indices(zero_based=False))
print(range_indices("2-last_2", maximum=10))

Will generate this output:

1-3 --> [0, 1, 2]
first-last --> [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
first-3,11,14-14,30,last --> [0, 1, 2, 10, 13, 29, 39]
first-3,11,14-14,30,last --> [1, 2, 3, 11, 14, 30, 40]
[1, 2, 3, 4, 5, 6, 7]

And this code:

from simple_range import Index, index_value

r = Index("1", maximum=10)
print(r, "-->", r.value())
r = Index("second", maximum=10)
print(r, "-->", r.value(zero_based=False))
r = Index("last", maximum=40)
print(r, "-->", r.value())
print(r, "-->", r.value(zero_based=False))
print(index_value("last_1", maximum=100, zero_based=False))

outputs this:

1 --> 0
second --> 2
last --> 39
last --> 40
99