python - Apply function n-times, using output of last as input of next -


for example, when traversing multiple levels hierarchy using dirname typically this.

grandparent = os.path.dirname(__file__) grandparent = os.path.dirname(grandparent)

or, in case of more levels.

grandparent =  = os.path.dirname(__file__) x in xrange(5):   grandparent = os.path.dirname(grandparent)

but wonder if there's less verbose method of doing this?

such as

grandparent = y(5, os.path.dirname, __file__)

where y mysterious function i'm looking for.

and if not, such function called?

what defining such higher order function yourself:

def repeat (f, x, n) :     in range(n):         x = f(x)     return x

with f function wish call, x first input in sequence, , n number of times wish call this.

you can call instance with:

>>> repeat(lambda x: x**2,2,3) 256 >>> repeat(os.path.dirname,'/home/kommusoft/testfolder/sqldump', 2) '/home/kommusoft'

if plan walk root of directory, using large number of repetitions not safe: never know user has made cascade of over 9 thousand directories.


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