Recipe ObjectiveIn the world of Content, there are many things that are present like, text, characters, special characters, and many more. Sometimes we just need the text for our ease of access and don't need any special characters or punctuation in it.So, We are going to see how to remove Punctuations from a text and only text will remain. Show
Master the Art of Data Cleaning in Machine Learning Table of Contents
Step 1- Taking a simple string or text and printing it
Printing the Simple Text for our Understanding : It, is better for waking up early in morning !!, than working late nights; So from the above we can see that in simple text punctuations are there and we need to remove them. So lets see how to do it. Step 2 - Storing all punctuations in a Variable
So in this we are taking a variable named All_punct which consist of all the Punctuations that we want to remove. Step 3 - Removing punctuations from the text
Now let us see the text after removing the punctuations : It is better for waking up early in morning than working late nights Here we can see that the punctuations were present in the text are removed by using the for loop and only text is remaining without any special character or punctuation. Step 4 - Removing punctuations by using re, importing re
It is more simpler than the other method we used for removing punctuation, just need to import re which is nothing but a regex. Step 5 - Taking another text and printing it
Printing the original text with punctuations : why can't i live freely ?? , It's just the : way i want it, no more interference required !! by any other side ; Step 6 - Removing punctuations using re, printing updated one
updated text with no punctuations : why cant i live freely Its just the way i want it no more interference required by any other side So here, we can get a idea about how regex works for removing the punctuations from a text Sometimes, we may wish to break a sentence into a list of words. In such cases, we may first want to clean up the string and remove all the punctuation marks. Here is an example of how it is done. Source Code
Output Hello he said and went In this program, we first define a string of punctuations. Then, we iterate over the provided string using a In each iteration, we check if the character is a punctuation mark or not using the membership test. We have an empty string to which we add (concatenate) the character if it is not punctuation. Finally, we display the cleaned up string. While doing some Python projects, we need to remove the Punctuation marks to make our code look cleaner. So, keeping this in mind, Python Pool brings you an in-depth article on removing the punctuation marks from a string, list, and file in Python. The whole article will be divided into three parts. In the first part, we will look at the elimination of punctuation from a string. After that, we will move on to the List, and subsequently, we will see how to remove Punctuation from a file in Python. Accordingly, without wasting any time, let’s directly jump into the tutorial.
What is a Punctuation Mark?According to Google: Any one of the marks (such as a period, comma, or question mark) used to divide a piece of writing into sentences, clauses, etc., are known as Punctuation marks. Broadly speaking, there are 14 Punctuation Marks listed in English Grammar. They are the period (full stop), question mark, exclamation point/mark, comma, semicolon, colon, dash, hyphen, parentheses, brackets, braces, apostrophe, quotation marks, and ellipses. In this article, we will see how to remove these punctuation marks from our program using Python. Removing Punctuation Marks from a String in PythonMoving to the first part of our article, we will discuss all possible ways to remove punctuation from a string in Python. At the same time, digging and researching this particular topic. I got to know about 5 ways to remove punctuation from a string. I will try my best to explain through examples and step by step walkthrough to get a clear cut idea. You will not look into other websites or video tutorials after reading this whole composition. 5 ways to Remove Punctuation from a string in Python:
Let’s start our journey with the above five ways to remove punctuation from a String in Python. Using a for Loop and Punctuation StringThis program will remove all punctuations out of a string. We’ll assess each part of the string using for loop. From time to time, we might want to split a sentence into a list of phrases. In these situations, we might first wish to wash up the string and eliminate all punctuation marks. Here’s a good illustration of how it’s completed. Let’s see the working through an example: punctuations = '''!()-[]{};:'"\,<>./[email protected]#$%^&*_~''' inp_str = input("Enter a string: ") no_punc = "" for char in inp_str: if char not in punctuations: no_punc = no_punc + char print("Punctuation Free String: ",no_punc) Output:
ExplanationThe above method to remove punctuation from a string in python is a simple brute way this task can be carried out. In this, we assess for the punctuations utilizing a raw string that contains punctuations, and we build string after removing those punctuations. In this program, we first defined a string named
‘punctuations‘ consists of all punctuation marks. After that, we have taken the input from the user and stored it in ‘inp_str’. Then we iterate over the provided string using a for loop. Using the Regex to Remove Punctuation from String in PythonPython gives us the regex library to manage all sorts of regular expressions and also control and manipulate the same. If you don’t know what a regular expression is let me tell you: A regular expression is a sequence of characters which specify a search pattern. Normally, these patterns are utilized by string-searching algorithms for “find” or” find and replace” operations on strings, or for input signal. It’s a strategy developed in theoretical computer science and formal language theory. Note: We need to import re library to work with regular expression. Regex in python comes with sub-string function and we will use that function. To remove punctuation from string in python. Syntax of re.sub
Let’s see the working through an example: Example to Remove Punctuation from a String in Python Using Regeximport re my_string = "Python P$#@!*oo()&l,. is ##th$e$ Bes.t pl*ace to [email protected] P)(*y&tho.n" op_string = re.sub(r'[^\w\s]','',my_string) print('String with Punctuation: ', my_string) print('String without Punctuation: ', op_string) Output:
ExplanationIn the above example, we need to import the regex library because we are using a function that is available in the regex library. Then we have our input string with punctuations in it. And we have stored it in the variable my_string. Subsequently, with the function re.sub we have, we have removed all the punctuations. Here in the parameters of ‘re.sub’ you might be wondering what r'[^\w\s] is. So, basically, r'[^\w\s] is a pattern to select characters and numbers. I prefer using Regular Expressions though as they easy to maintain and also easier to understand (if someone else is reading your code). By using the translate() method to Remove Punctuation From a String in PythonThe string translate method is the fastest way to remove punctuation from a string in python. The translate() function is available in the built-in string library. So, we need to import string module to use translate function. If you don’t know what translate function do is let me explain it to you. The Let’s see the working through an example: Example To Remove Punctuation From A String In Python Using Translate Functionimport string my_string = "H*!i I a&m [email protected]$an F)(&rom Python P$#@!*oo()&l," op_string = my_string.translate(str.maketrans('', '', string.punctuation)) print('String with Punctuation: ', my_string) print('String without Punctuation: ', op_string) Output:
ExplanationIn the above example firstly we need to import the string library. As the translate method is a part of the string module in python. After that, we have initialized our string which consists of a lot of punctuation marks. We can remove all punctuation from these values using the translate() method in the next step. How this method work is it makes a copy of a string with a specific set of values substituted. To make this work, we’re going to use the string.punctuation as a parameter in the translate method. This method, which is part of the “string” library, gives us a list of all punctuation marks. Using the join() Method to Remove Punctuation from String in PythonWe can also use the The syntax of the
The import string st = "This , is a sam^ple string f#^[email protected] P#@ytho&n P#o#o*~l" exclude = set(string.punctuation) st = ''.join(ch for ch in st if ch not in exclude) print(st) Output:
Explanation:In the given example, we first start importing the string module. This module provides multiple sets of characters as per your need. In our case, we required all the punctuation characters and created a set of those punctuation marks. Next, we used the join method to combine all the characters by eliminating the punctuation marks in one line. The join function can be used as a one-liner initializer for lists and strings. In this case, we used it for the sample string. By Using Generator ExpressionThe last but not the least method to remove punctuation from a string in Python is by using the generator. Generators are a simple way of creating iterators. It returns an object (iterator) which we can iterate over (one value at a time). def remove_punc_generator(string): punc = '''!()-[]{};:'"\,<>./[email protected]#$%^&*_~''' for ele in string: if ele in punc: string = string.replace(ele, "") yield string sample = "This is, a list! For% #Pythonpool" sample = remove_punc_generator(sample) print(next(sample)) Output:
Explanation:There are multiple ways of creating a generator. Two of them are by using yield statements and () comprehension. In the given example, we’ve used the yield to create a generator object for our string. Firstly, we start by creating a function that accepts a string and then yields the string in the final statement. The yield statement allows the function to return a generator object, further using the next() function. In our code’s last statement, we’ve used the next(sample) to get the item from the generator object. Removing Punctuation From a List in PythonWe have talked about a lot of methods to remove punctuation from a string in Python. But the string is not the only thing in python. We have Lists too. The list is one of the most popular built-in data types. So, it’s become mandatory for us to talk about such a popular datatype and how to remove punctuation from the Lists in Python. If you guys don’t know what a list is let me briefly explain it to you: The list is a most flexible datatype available in Python. List can be written as a list of comma-separated values (items) between square brackets. Important thing about a list is that items in a list need not be of the same type. Without wasting any time let’s directly jump to example: Example to Remove Punctuation From a List in Pythonlis = ["[email protected]!is", "i#s" , "*&a", "list!", "For%", "#Pyt#$hon.?^pool"] def remove_punc(string): punc = '''!()-[]{};:'"\, <>./[email protected]#$%^&*_~''' for ele in string: if ele in punc: string = string.replace(ele, "") return string lis = [remove_punc(i) for i in lis] print(lis) # cleaned list Output:
Explanation:Lists are one of the most used data types in python. There are multiple ways for iterating through the list. In the above example, we’ll use list comprehension to loop through all the elements of the list. Firstly, we start by creating a customized function that accepts a string as a parameter and removes all the string’s punctuations. The removal process is done by replacing all the punctuation marks with an empty character in the string. Then we create a sample list consisting of multiple strings and use the list comprehension method to apply remove_punc() on each of the list elements. Then finally, to check the list, print() is used. How to Remove Punctuation From a File in PythonWhile doing some projects and some mathematical tasks it becomes necessary to have a clean and clear text file to work with. Which has no punctuation marks in it. So, that we can perform mathematical calculations easily. Original Text File with Punctuationfilename = input("Enter filename: ") def remove_punc(string): punc = '''!()-[]{};:'"\, <>./[email protected]#$%^&*_~''' for ele in string: if ele in punc: string = string.replace(ele, "") return string try: with open(filename,'r',encoding="utf-8") as f: data = f.read() with open(filename,"w+",encoding="utf-8") as f: f.write(remove_punc(data)) print("Removed punctuations from the file", filename) except FileNotFoundError: print("File not found") Output: Clean text file after removing punctuation using PythonExplanation:Reading and Writing files is an integral part of python codes, and every coder must know how to do it. To do the same, we’ve used the open() method to read and write files. Firstly, we declare a user input variable that asks the user to enter a filename. Next, we created a customized function to remove all the string punctuation characters. Then we read the file using an open() statement. To avoid the File Not Found error, we’ve used the try-catch method to inform the end-user that the filename is invalid. Then, we use remove_punc() to remove all the punctuation characters and rewrite the file using the open() method. You Might Be Also Interested in Reading:
ApplicationThis can have application in data preprocessing in Data Science domain and also in day-day programming. ConclusionTo summarize, in this post, you have learned various methods to remove punctuation marks from a string, list, and file in Python. However, if you have any doubts or questions, do let me know in the comment section below. I will try to help you as soon as possible. Happy Pythoning! How do you remove punctuation from a data set?“remove punctuation in dataframe column” Code Answer's. # Define the function to remove the punctuation.. def remove_punctuations(text):. for punctuation in string. punctuation:. text = text. replace(punctuation, ''). return text.. # Apply to the DF series.. df['new_column'] = df['column']. apply(remove_punctuations). How do I remove punctuation from a csv file in Python?By using the translate() method to Remove Punctuation From a String in Python. The string translate method is the fastest way to remove punctuation from a string in python. The translate() function is available in the built-in string library. So, we need to import string module to use translate function.
How do I get rid of punctuation in pandas?How To Remove Punctuation From Pandas. str.replace(). regex.sub(). and str.translate(). How do I remove a comma from a dataset in Python?sub() function removes commas from the python string.
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