Python Counter Example

Use the Counter object from the collections module. Count frequencies of values.

Counter. Often in programs we want to record the number of uses, hits, or instances of something. We collect (count) frequencies.

With Counter, from the collections module, we can do this with minimal set-up code. We access the Counter like a list, but can count strings or numbers.

First example. Here we import Counter from the collections module. We then use range loops to count numbers in the Counter. The counts accumulate.

Display: We can display values by accessing each key, or we can display the entire counter by passing it to the print method.

Python program that uses Counter from collections import Counter # Create new counter. freqs = Counter() # Add to the counter based on ranges of numbers. for i in range(0, 10): freqs[i] += 1 for i in range(0, 5): freqs[i] += 1 for i in range(0, 2): freqs[i] += 1 # Display counter contents. for i in range(0, 10): print(f"Value at {i} is {freqs[i]}") # The counter can be displayed directly. print(freqs) Output Value at 0 is 3 Value at 1 is 3 Value at 2 is 2 Value at 3 is 2 Value at 4 is 2 Value at 5 is 1 Value at 6 is 1 Value at 7 is 1 Value at 8 is 1 Value at 9 is 1 Counter({0: 3, 1: 3, 2: 2, 3: 2, 4: 2, 5: 1, 6: 1, 7: 1, 8: 1, 9: 1})

Strings. We can do more things with a counter than just increment by one. We can decrement. Or we can assign values. We can also use string keys in the counter.Strings

Python program that uses Counter with strings from collections import Counter freqs = Counter() print(freqs) # Three birds are born. freqs["bird"] += 1 freqs["bird"] += 1 freqs["bird"] += 1 print(freqs) # One bird was killed. freqs["bird"] -= 1 print(freqs) # Four birds were counted. freqs["bird"] = 4 print(freqs) Output Counter() Counter({'bird': 3}) Counter({'bird': 2}) Counter({'bird': 4})

A summary. The collections module in Python contains useful collections like Counter. For recording the frequencies of numbers and strings (and other things) we can use Counter.

A major benefit. For Counter, a major benefit is that less initialization logic is needed. So we can spend more attention on counting rather than dealing with a dictionary.Dictionary

The Dev Codes

.Net

.NET Array Dictionary List String 2D Async DataTable Dates DateTime Enum File For Foreach Format IEnumerable If IndexOf Lambda LINQ Parse Path Process Property Regex Replace Sort Split Static StringBuilder Substring Switch Tuple

Java

Core Array ArrayList HashMap String 2D Cast Character Console Deque Duplicates File For Format HashSet If IndexOf Lambda Math ParseInt Process Random Regex Replace Sort Split StringBuilder Substring Switch Vector While

Related Links

Adjectives Ado Ai Android Angular Antonyms Apache Articles Asp Autocad Automata Aws Azure Basic Binary Bitcoin Blockchain C Cassandra Change Coa Computer Control Cpp Create Creating C-Sharp Cyber Daa Data Dbms Deletion Devops Difference Discrete Es6 Ethical Examples Features Firebase Flutter Fs Git Go Hbase History Hive Hiveql How Html Idioms Insertion Installing Ios Java Joomla Js Kafka Kali Laravel Logical Machine Matlab Matrix Mongodb Mysql One Opencv Oracle Ordering Os Pandas Php Pig Pl Postgresql Powershell Prepositions Program Python React Ruby Scala Selecting Selenium Sentence Seo Sharepoint Software Spellings Spotting Spring Sql Sqlite Sqoop Svn Swift Synonyms Talend Testng Types Uml Unity Vbnet Verbal Webdriver What Wpf

TheDeveloperBlog.com

Python Counter Example

Related Links:

.Net

Java

Related Links