Cutter is a small python module that add some sugar on top of list like objects to ease list traversal.
from cutter import cut
numbers = [
['one', 'two', 'three'],
['un', 'deux', 'trois'],
['uno', 'due', 'tre']
]
>>> cut(numbers)[1] # Take the second element of every sublist
['two', 'deux', 'due']*
>>> cut(numbers)[1, 2] # Take the third letter of every second element of every sublist
['o', 'u', 'e'].
>>> cut(numbers)[1][2] # Idem
['o', 'u', 'e'].
>>> cut(numbers)[1, 2].upper() # Upper case the third letter of every second element of every sublist
['O', 'U', 'E']
>>> cut(numbers)[...] # Flatten the list for one level
['one', 'two', 'three', 'un', 'deux', 'trois', 'uno', 'due', 'tre']
>>> cut(numbers)[..., 0] # First letter of every elements
['o', 't', 't', 'u', 'd', 't', 'u', 'd', 't'].There are two syntaxic sugars for an even easier use:
from cutter import _
>>> numbers |_ [1]
['two', 'deux', 'due']*
>>> (numbers |_ [1] |_ [2] |_ .upper)()
['O', 'U', 'E']
>>> numbers |_ [...]
['one', 'two', 'three', 'un', 'deux', 'trois', 'uno', 'due', 'tre']
>>> numbers |_ [..., 0]
['o', 't', 't', 'u', 'd', 't', 'u', 'd', 't'].This syntax is meant for use in shells.
It is for example used in wdb and the bundled cut.py interpreter.
Cutter provide a bang_compile function which is a wrapper of the python builtin compile function.
# This code muste be compiled with cutter.utils.bang_compile
>>> numbers!1
['two', 'deux', 'due']*
>>> numbers!1!2!upper()
['O', 'U', 'E']
>>> numbers!*
['one', 'two', 'three', 'un', 'deux', 'trois', 'uno', 'due', 'tre']
>>> numbers!*!0
['o', 't', 't', 'u', 'd', 't', 'u', 'd', 't'].This syntax use the python tokenizer and ast to make it work. This is really useful when debugging to inspect list content.
Cutter works with dictionaries too:
cut(dict)['key']slices:
cut(list)[:5]For more examples see the test files : test
Cutter is compatible with at least: python 2.6, 2.7, 3.2, 3.3, 3.4 and pypy and is licensed under lgpl v3