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pytricks's Introduction

Build Status

Intention

Creating a knowledge base of unpopular Python built-in features to save a lot of unnecessary code.

Contribute

Feel free to use the PyTrickBase.txt as a starting point.

  1. Pull request:

    Send a pull request with your PyTrick, containing example code and a documentation one-liner. Be sure to add yourself to the contributors.

  2. Issue comment:

    Add your Python snippet and your documentation as a comment on Issue#1. I will take care of adding your PyTrick and you as a contributor.

Requirements

  • only use the standard Python library
  • compared to the "general approach":
    • improve readability
    • improve performance
    • implement functionality in a shorter way

Contact

  1. message me at @__brennerm
  2. send an email to [email protected]

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pytricks's Issues

New Trick: judge an object in a list of tuple

#! /usr/bin/env python
'''there is a list of tuple, and if you want to judge an object in this list by an elegant way, then...'''

from more_itertools import flatten     # pip install more_itertools

types = [('E', 'I'), ('S', 'N'), ('T', 'F'), ('J', 'P')]

if __name__ == '__main__':    
    assert 'E' in flatten(types)
    assert 'X' in flatten(types)

Grouping adjacent

grouping adjacent use zip and iter...
some code like this:

lst  = range(10)
group_n = lambda lst, n: zip(*([iter(lst)] * n))
print group(lst, 3)
#output
#[(0, 1, 2), (3, 4, 5), (6, 7, 8)]

Is the repo dead?

I am asking because I am not seeing any response to PR's or issues for quite some time?

Any ideas guys?

Netsed if else

Traditional way

if a > 7:
    b = '>7'
elif a == 7:
    b = '7'
else:
    b = '<7'

hack

b = '>7' if a > 7 else '7' if a == 7 else '<7'

characters_occurrence.py

! /usr/bin/env python3

"""To find the number of times characters are repeated in a string """

from collections import Counter

Counter('abracadabra').most_common(3)

[('a', 5), ('r', 2), ('b', 2)]

The argument of most_common is the number of items to be returned

Default will return count for all characters

Counter('abracadabra').most_common(1)

[('a', 5)]

Add a reversestring.py file

I've made a pull request - #73.

Thought it would be worth an issue to go along side in case it warranted a discussion.

As stated in the pull request:

I think we could justify having a separate file from reverselist for reversing strings and ints.

Some newbies don't have the conceptual leap from slicing lists to slicing strings.

Other possibility is to merge the two into a reverseiterable.py but I feel this is less explicit than two separate files.

patternify

traditional way

'''
Printing the pattern
*
**
***
****
'''
for i in range(1,4+1):
    for j in range(i):
       print('*', end='')
    print()

hack

print('\n'.join(['*' * i for i in range(1, 4+1)])

structure collection

At first I want to thank all of you for your help, didn't expect this to become that big :).

All those contributions lead to fact that we need some kind of structuring.
When I enter this repo I feel a little bit overwhelmed with this amount of files.

The question that raises is "What's the right way?". Order them by data types, differentiate between function, performance and readability tricks, etc.. Maybe you guys even decide, that we should leave it as it is.

Feel free to add your opinion :)

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