How to use extract a list of keys with specific pattern from dict in python? -



How to use extract a list of keys with specific pattern from dict in python? -

i need can extract list of keys have type name: carro_x, x number. yielding:

lista = ['carro_1','carro_2','carro_50']

from:

diccionario = { 'carro_1':'renault', 'carro_2':'audi', 'carro_50':'sprint', 'camioneta':'tucson' }

how using str.startswith:

using list comprehension (no need utilize iterkeys or keys method; iterating dictionary yeidls keys):

>>> diccionario={ ... 'carro_1':'renault', ... 'carro_2':'audi', ... 'carro_50':'sprint', ... 'camioneta':'tucson', ... } >>> [key key in diccionario if key.startswith('carro_')] ['carro_1', 'carro_50', 'carro_2']

note dictionary has no order. need sort result if want ordered result.

>>> sorted(['carro_1', 'carro_50', 'carro_2'], key=lambda key: int(key.split('_')[1])) ['carro_1', 'carro_50', 'carro_2']

update

to more correct, should take business relationship digits part. utilize str.isdigit check whether string consist of digits.

>>> [key key in diccionario ... if key.startswith('carro_') , key.split('_', 1)[1].isdigit()] ['carro_1', 'carro_50', 'carro_2']

python list python-2.7 dictionary

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