avatar Bite 172. Having fun with Python Partials

Meet another gem in the standard library: functools, which contains tools for functional-style programming.

In this Bite you will play with its useful partial() function which - as per PEP 309 - lets you construct variants of existing functions that have some of the parameters filled in.

The original PEP (Python 2) also shows a small but realistic example:

import functools

def log (message, subsystem):
    "Write the contents of 'message' to the specified subsystem."
    print '%s: %s' % (subsystem, message)

server_log = functools.partial(log, subsystem='server')
server_log('Unable to open socket')

In this Bite you will apply this concept to the round builtin:

>>> round(10.42342, 2)

Write two partials to add the default behavior of rounding to 0 and 4 places respectively.

See the template code below. If you get stuck maybe this article will help you.

Good luck and keep calm and code in Python!

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