Wednesday, November 26, 2014

Top 10 Python idioms I wish I'd learned earlier



I've been programming all my life, but never been a programmer. Most of my work was done in Visual Basic because it's what I was most comfortable with, plus a smattering of other languages (R, C, JavaScript, etc... Pascal, Applescript, Hypertext and BASIC, which I learned in 1979, if you go far back enough). A couple of years ago, I decided to use Python exclusively so that I could improve my coding. I ended up re-inventing many wheels -- which I didn't mind too much, because I enjoy solving puzzles. But sometimes it's good to have a more efficient, Pythonesque approach, and time after time I found myself having "aha!" moments, realizing I'd been doing things the hard, excessively verbose way for no reason. Here is a list of ten Python idioms that would have made my life much easier if I'd thought to search for them early on.

Missing from this list are some idioms such as list comprehensions and lambda functions, which are very Pythonesque and very efficient and very cool, but also very difficult to miss because they're mentioned on StackOverflow every other answer! Also ternary x if y else z constructions, decorators and generators, because I don't use them very often.

There's also an IPython notebook nbviewer version of this document if you prefer.



1. Python 3-style printing in Python 2


One of the things that kept me from concentrating on Python was this whole version 2 - version 3 debacle. Finally I went with Python 2 because all the libraries I wanted were not 3-compatible, and I figured if I needed to, I would laboriously adjust my code later.

But really, the biggest differences in everyday programming are printing and division, and now I just import from future. Now that almost all the libraries I use heavily are v3-compliant, I'll make the switch soon.
mynumber = 5

print "Python 2:"
print "The number is %d" % (mynumber)
print mynumber / 2,
print mynumber // 2

from __future__ import print_function
from __future__ import division

print('\nPython 3:')
print("The number is {}".format(mynumber))
print(mynumber / 2, end=' ')
print(mynumber // 2)
Python 2:
The number is 5
2 2

Python 3:
The number is 5
2.5 2

Oh, and here's an easter egg for C programmers:
from __future__ import braces
  File "<ipython-input-3-2aebb3fc8ecf>", line 1
    from __future__ import braces
SyntaxError: not a chance

2. enumerate(list)


It might seem obvious that you should be able to iterate over a list and its index at the same time, but I used counter variables or slices for an embarrassingly long time.
mylist = ["It's", 'only', 'a', 'model']

for index, item in enumerate(mylist):
    print(index, item)
0 It's
1 only
2 a
3 model

3. Chained comparison operators


Because I was so used to statically typed languages where this idiom would be ambiguous, it never occurred to me to put two operators in the same expression. In many languages, 4 > 3 > 2 would return as False, because (4 > 3) would be evaluated as a boolean, and then True > 2 would be evaluated as False. EDIT: I'm informed that, in Python, this construction falls under the category of "syntactic sugar".
mynumber = 3

if 4 > mynumber > 2:
    print("Chained comparison operators work! \n" * 3)
Chained comparison operators work! 
Chained comparison operators work! 
Chained comparison operators work! 


4. collections.Counter


The collections library is, like, the best thing ever. Stackoverflow turned me on to ordered dicts early on, but I kept using a snippet to create dicts to count occurrences of results in my code. One of these days, I'll figure out a use for collections.deque.
from collections import Counter
from random import randrange
import pprint
mycounter = Counter()
for i in range(100):
    random_number = randrange(10)
    mycounter[random_number] += 1
for i in range(10):
    print(i, mycounter[i])
0 10
1 10
2 13
3 6
4 6
5 11
6 10
7 14
8 12
9 8

5. Dict comprehensions


A rite of passage for a Python programmer is understanding list comprehensions, but eventually I realized dict comprehensions are just as useful -- especially for reversing dicts.
my_phrase = ["No", "one", "expects", "the", "Spanish", "Inquisition"]
my_dict = {key: value for value, key in enumerate(my_phrase)}
print(my_dict)
reversed_dict = {value: key for key, value in my_dict.items()}
print(reversed_dict)
{'Inquisition': 5, 'No': 0, 'expects': 2, 'one': 1, 'Spanish': 4, 'the': 3}
{0: 'No', 1: 'one', 2: 'expects', 3: 'the', 4: 'Spanish', 5: 'Inquisition'}

6. Executing shell commands with subprocess


I used to use the os library exclusively to manipulate files; now I can even programmatically call complex command-line tools like ffmpeg for video editing

(And yes, I use Windows, so do all of my clients. But I have the good grace to be embarrassed about it!)

Note that the particular subprocess I picked would be much better done with the os library; I just wanted a command everyone would be familiar with. And in general, shell=True is a VERY bad idea, I put it here so that the command output would appear in the IPython notebook cell. Don't try this at home, kids!
import subprocess
output = subprocess.check_output('dir', shell=True)
print(output)
 Volume in drive C is OS
 Volume Serial Number is [REDACTED]
 Directory of C:\Users\David\Documents\[REDACTED]

2014-11-26  06:04 AM    <DIR>          .
2014-11-26  06:04 AM    <DIR>          ..
2014-11-23  11:47 AM    <DIR>          .git
2014-11-26  06:06 AM    <DIR>          .ipynb_checkpoints
2014-11-23  08:59 AM    <DIR>          CCCma
2014-09-03  06:58 AM            19,450 colorbrewdict.py
2014-09-03  06:58 AM            92,175 imagecompare.ipynb
2014-11-23  08:41 AM    <DIR>          Japan_Earthquakes
2014-09-03  06:58 AM             1,100 LICENSE
2014-09-03  06:58 AM             5,263 monty_monte.ipynb
2014-09-03  06:58 AM            31,082 pocket_tumblr_reddit_api.ipynb
2014-11-26  06:04 AM             3,211 README.md
2014-11-26  06:14 AM            19,898 top_10_python_idioms.ipynb
2014-09-03  06:58 AM             5,813 tree_convert_mega_to_gexf.ipynb
2014-09-03  06:58 AM             5,453 tree_convert_mega_to_json.ipynb
2014-09-03  06:58 AM             1,211 tree_convert_newick_to_json.py
2014-09-03  06:58 AM            55,970 weather_ML.ipynb
              11 File(s)        240,626 bytes
               6 Dir(s)  180,880,490,496 bytes free

7. dict .get() and .iteritems() methods


Having a default value when a key does not exist has all kinds of uses, and just like enumerate() for lists, you can iterate over key, value tuples in dicts
my_dict = {'name': 'Lancelot', 'quest': 'Holy Grail', 'favourite_color': 'blue'}

print(my_dict.get('airspeed velocity of an unladen swallow', 'African or European?\n'))

for key, value in my_dict.iteritems():
    print(key, value, sep=": ")
African or European?

quest: Holy Grail
name: Lancelot
favourite_color: blue

8. Tuple unpacking for switching variables


Do you know how many times I had to use a third, temporary dummy variable in VB? c = a; a = b; b = c?
a = 'Spam'
b = 'Eggs'

print(a, b)

a, b = b, a

print(a, b)
Spam Eggs
Eggs Spam

9. Introspection tools


I was aware of dir(), but I had assumed help() would do the same thing as IPython's ? magic command. It does way more. (This post has been updated after some great advice from reddit's /r/python which, indeed, I wish I'd known about before!)
my_dict = {'That': 'an ex-parrot!'}
    
help(my_dict)
Help on dict object:

class dict(object)
 |  dict() -> new empty dictionary
 |  dict(mapping) -> new dictionary initialized from a mapping object's
 |      (key, value) pairs
 |  dict(iterable) -> new dictionary initialized as if via:
 |      d = {}
 |      for k, v in iterable:
 |          d[k] = v
 |  dict(**kwargs) -> new dictionary initialized with the name=value pairs
 |      in the keyword argument list.  For example:  dict(one=1, two=2)
 |  
 |  Methods defined here:
 |  
 |  __cmp__(...)
 |      x.__cmp__(y) <==> cmp(x,y)
 |  
 |  __contains__(...)
 |      D.__contains__(k) -> True if D has a key k, else False
 |  
 |  __delitem__(...)
 |      x.__delitem__(y) <==> del x[y]
 |  
 |  __eq__(...)
 |      x.__eq__(y) <==> x==y
 |  
 
[TRUNCATED FOR SPACE]

 |  
 |  update(...)
 |      D.update([E, ]**F) -> None.  Update D from dict/iterable E and F.
 |      If E present and has a .keys() method, does:     for k in E: D[k] = E[k]
 |      If E present and lacks .keys() method, does:     for (k, v) in E: D[k] = v
 |      In either case, this is followed by: for k in F: D[k] = F[k]
 |  
 |  values(...)
 |      D.values() -> list of D's values
 |  
 |  viewitems(...)
 |      D.viewitems() -> a set-like object providing a view on D's items
 |  
 |  viewkeys(...)
 |      D.viewkeys() -> a set-like object providing a view on D's keys
 |  
 |  viewvalues(...)
 |      D.viewvalues() -> an object providing a view on D's values
 |  
 |  ----------------------------------------------------------------------
 |  Data and other attributes defined here:
 |  
 |  __hash__ = None
 |  
 |  __new__ = 
 |      T.__new__(S, ...) -> a new object with type S, a subtype of T

10. PEP-8 compliant string chaining


PEP8 is the style guide for Python code. Among other things, it directs that lines not be over 80 characters long and that indenting by consistent over line breaks.

This can be accomplished with a combination of backslashes \; parentheses () with commas , ; and addition operators +; but every one of these solutions is awkward for multiline strings. There is a multiline string signifier, the triple quote, but it does not allow consistent indenting over line breaks.

There is a solution: parentheses without commas. I don't know why this works, but I'm glad it does.
my_long_text = ("We are no longer the knights who say Ni! "
                "We are now the knights who say ekki-ekki-"
                "ekki-p'tang-zoom-boing-z'nourrwringmm!")
print(my_long_text)
We are no longer the knights who say Ni! We are now the knights who say ekki-ekki-ekki-p'tang-zoom-boing-z'nourrwringmm!

• • •

127 comments:

  1. Thank you for the short list. I found it very helpful.

    ReplyDelete
  2. > 3. Chained comparison operators
    >
    > Because I was so used to statically typed languages (where this idiom would be ambiguous),

    This has nothing to do with typing at all. It's purely a syntactic sugar that Python provided.

    > 7. dict .get() and .iteritems() methods

    Note that in Python 3, 'iteritems' has been renamed to 'items'.

    > 10. PEP-8 compliant string chaining

    Similarly, this is also just a syntactic sugar and works on string literals only:

    https://docs.python.org/2/reference/lexical_analysis.html#string-literal-concatenation

    ReplyDelete
  3. Counter(randrange(10) for i in range(100))

    Keep good idiom for the examples. ;)

    ReplyDelete
  4. It is also worth noting that enumerate supports an optional `start` parameter, which can be pretty useful:
    https://docs.python.org/2/library/functions.html#enumerate

    with open('foobar.txt') as f:
    for lineno, line in enumerate(f, start=1):
    print('Reading line {0}'.format(lineno))


    Also, as a suggestion, put links to the official Python documentation for each function/class/module, wherever possible. :)

    ReplyDelete
  5. My favorite in collections: collector.defaultdict. It's a bit like Counter, but more general.

    ReplyDelete
  6. For number 4 you can do the following:

    for _ in range(100):
    random_number = randrange(10)
    mycounter[random_number] += 1

    The underscore is used for throwaway variables. It just indicates that the loop variable isn't actually used.

    ReplyDelete
  7. Nice post,

    Just to add one thing and that is droping into interactive mode (REPL)

    from IPython import embed
    # Misc code
    embed()

    I borrowed it from: http://daguar.github.io/2014/06/05/just-dropped-in-interactive-coding-in-ruby-python-javascript/

    ReplyDelete
    Replies
    1. Nice! Another one idea is to use a breakpoint, specially with "pudb": https://pypi.python.org/pypi/pudb

      import pudb
      pudb.set_trace()

      or

      import pudb
      pu.db

      Delete
  8. +1 for the holy grails references, put a smile on me.

    ReplyDelete
  9. print "bla {} bla".format( something )

    ReplyDelete
    Replies
    1. Worth noting that earlier versions (Python 2.7 and some less recent Python 3.x) require a number inside the braces: print "bla {0} bla".format(something)

      Or even: print "stuff={0!r}".format(stuff) # !r will use repr() on the argument

      Delete
  10. Nice post!
    Do you allow I translate it to Chinese?

    ReplyDelete
  11. There is `textwrap.dedent` to do what you want with triple quoted strings: http://bit.ly/1Ie7pyR

    ReplyDelete
  12. Thanks, especially for the collections.Counter. Very useful

    ReplyDelete
  13. #10 is a new one to me, I plan on changing a bunch of long strings today. Thanks, great one that!

    ReplyDelete
  14. Collections was a great reminder!!! loved it! hope to see more
    Thank you!

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  18. You can avoid collections.Counter with this code:

    from random import randint

    for i, j in enumerate((randint(10) for i in range(10))):
    __print(i, j)

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  53. خدمات نقل وتخزين الاثاث
    تعرف شركة شراء اثاث مستعمل جدة
    ان الاثاث من اكثر الاشياء التي لها ثمن غالي ومكلف للغايةويحتاج الي عناية جيدة وشديدة لقيام بنقلة بطريقة غير مثالية وتعرضة للخدش او الكسر نحن في غني عنه فأن تلفيات الاثاث تؤدي الي التكاليف الباهظة نظرا لتكلفة الاثاث العالية كما انه يؤدي الي الحاجه الي تكلفة اضافية لشراء اثاث من جديد ،
    شركة شراء اثاث مستعمل بجدة
    ، ونظرا لان شركة نقل اثاث بجدة من الشركات التى تعلم جيدا حجم المشكلات والاضرار التى تحدث وهي ايضا من الشركات التى على دراية كاملة بكيفية الوصول الى افضل واحسن النتائج فى عملية النقل ،كل ماعليك ان تتعاون مع شركة شراء الاثاث المستعمل بجدة والاعتماد عليها بشكل كلي في عملية نقل الاثاث من اجل الحصول علي افضل النتائج المثالية في عمليات النقل
    من اهم الخدمات التي تقدمها شركة المستقبل في عملية النقل وتجعلك تضعها من
    ضمن اوائل الشركات هي :
    اعتماد شراء الاثاث المستعمل بجدة علي القيام بأعمال النقل علي عدة مراحل متميزة من اهما اثناء القيام بالنقل داخل المملكة او خارجها وهي مرحلة تصنيف الاثاث عن طريق المعاينة التي تتم من قبل الخبراء والفنين المتخصصين والتعرف علي اعداد القطع الموجودة من قطع خشبية او اجهزة كهربائية ا تحف او اثاث غرف وغيرهم.
    كما اننا نقوم بمرحلة فك الاثاث بعد ذلك وتعتمد شركتنا في هذة المرحلة علي اقوي الاساليب والطرق المستخدمة ويقوم بذلك العملية طاقم كبير من العمالة المتربة للقيام بأعمال الفك والتركيب.
    ارقام شراء الاثاث المستعمل بالرياضثم تأتي بعد ذلك مرحلة التغليف وهي من اهم المراحل التي تعمل علي الحفاظ علي اثاث منزلك وعلي كل قطعة به وتتم عملية التغليف بطريقة مميزة عن باقي الشركات.
    محلات شراء الاثاث المستعمل بالرياضويأتي بعد ذلك للمرحلة الاخيرة وهي نقل الاثاث وتركيبة ويتم اعتمادنا في عملية النقل علي اكبر الشاحنات المميزة التي تساعد علي الحفاظ علي كل قطع اثاثك اثناء عملية السير والنقل كما اننا لا نتطرق الي عمليات النقل التقليدية لخطورتها علي الاثاث وتعرضة للخدش والكسر .
    تخزين الاثاث بالرياض
    ارقام شراء الاثاث المستعمل بجدة
    تمتلك شركة المستقبل افضل واكبر المستودعات المميزة بجدة والتي تساعد علي تحقيق اعلي مستوي من الدقة والتميز فأذا كنت في حيرة من اتمام عملية النقل والتخزين فعليك الاستعانة بشركة نقل اثاث بجدة والاتصال بنا ارقام محلات شراء الاثاث المستعمل بجدة
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