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Python专业技巧： Start using Python defaultdict and Counter in place ...

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Python专业技巧：Start using Python defaultdict and Counter in place of dictionary，使用defaultdict and Counter代替字典。

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https://towardsdatascience.com/python-pro-tip-start-using-python-defaultdict-and-counter-in-place-of-dictionary-d1922513f747 1/7

Python Shorts

PythonProTip:StartusingPython

defaultdictandCounterinplaceof

dictionary

How you could use defaultdict and Counter

to make your code short andreadable

Learningalanguageiseasy.WheneverIstartwithanew

language,Ifocusonafewthingsinbeloworder,anditisabreezeto

getstartedwithwritingcodeinanylanguage.

OperatorsandDataTypes:+,-,int,float,str

Conditionalstatements:if,else,case,switch

Loops:For,while

Datastructures:List,Array,Dict,Hashmaps

DefineFunction

Rahul Agarwal

Apr 22

4 min read

•

Photo by Brooke Lark onUnsplash

6/24/2019 Python Pro Tip: Start using Python defaultdict and Counter in place of dictionary

https://towardsdatascience.com/python-pro-tip-start-using-python-defaultdict-and-counter-in-place-of-dictionary-d1922513f747 2/7

However,learningtowritealanguageandwritinga

languageinanoptimizedwayaretwodifferentthings.

EveryLanguagehassomeingredientswhichmakeitunique.

Yet,anewprogrammertoanylanguagewillalwaysdo

someforcedoverfitting.AJavaprogrammer,newtopython,for

example,mightwritethiscodetoaddnumbersinalist.

x=[1,2,3,4,5]

sum_x=0

foriinrange(len(x)):

sum_x+=x[i]

Whileapythonprogrammerwillnaturallydothis:

sum_x=sum(x)

Inthisseriesofpostsnamed‘PythonShorts’,Iwillexplainsome

simpleconstructsprovidedbyPython,someessentialtipsandsome

usecasesIcomeupwithregularlyinmyDataSciencework.

Thisseriesisaboutefficientandreadablecode.

. . .

Counter and defaultdict —

UseCases

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