Python delete word from string

In this tutorial, different methods are demonstrated on how to remove word from string in Python. We will study two ways to achieve this. First, we will discuss how to remove a specific word from sentences in Python. Then, we will discuss how to remove duplicate words from a string in Python.

How to Remove Word from Sentence in Python

We will first discuss methods to remove words from a string in Python.

Using the replace() function

We can use the replace() function to remove word from string in Python. This function replaces a given substring with the mentioned substring. We can replace a word with an empty character to remove it.

For example,

Output:

remove from this

We can also specify how many occurrences of a word we want to replace in the function. For this, we can use the count parameter. By default, all occurrences are replaced.

Using the re.sub() function

The regular expressions can identify parts of a string using a pattern. The re.sub() function replaces a given substring that matches the regular expression pattern with some desired string.

We can identify specific words using regular expressions and substitute them with an empty string to remove them.

See the code below.

Output:

remove from this

In the above example, the re.compile() function compiles a pattern that identifies the substring word.

Using the startswith() function

This method can remove word from the start of the sentence. The startswith() function returns True or False, based on whether the string starts with a given value or not.

In this method, if the function returns True, we will slice the string till the length of the word to be removed.

See the code below.

Output:

remove from this

Using the removeprefix() function

This is similar to the previous method. It will only remove words from the start of the sentence if they exist. This function only exists in Python 3.9 and above.

For example,

Output:

remove from this

Using the endswith() function

This method can remove a word from the end of a sentence. The endswith() function returns True or False, based on whether the string ends with a given value or not.

Here also, we will slice the string if the function returns True.

See the code below.

Output:

remove from this

Using the removesuffix() function

This method is similar to the previous one and can eliminate a word from the end of the string. It is only available in Python 3.9 and above.

For example,

Output:

remove from this

How to Remove Duplicate Words from String in Python

We will now discuss how to remove duplicate words from string in Python. A common operation in these methods involves splitting a string into a list of words. For this, we use the split() function as shown in the sample codes.

Using the set() function

A set is an unordered collection of elements. It contains only unique elements. We can use it to store a collection of unique words from a string.

We can then use a for loop to compare each word and check whether it belongs in the set object or not. If the object is not present, it is appended to the final string.

We implement this logic in the code below.

Output:

remove word from this

In the above example, we can observe that we have successfully removed any duplicate words from the string a1.

Using the set() and join() functions

This method uses a similar approach to the previous method. We will proceed by splitting a string into a list of words. We will then pass this list to the set() function and automatically remove any duplicate words.

After this, we will convert the words stored in the set object back to a string. For this, we will use the join() function. With the join() function, we can combine the elements of an iterable in a string by providing the separator character for the elements.

Let us now use both these functions to remove duplicate words from a string in Python.

See the code below.

Output:

remove word from this

In the above example, we use the sorted() function to maintain the order of the words in the string. We sort it by their index in the list l.

Using the join() and a user-defined function

This method also follows a similar approach to the previous one. We will start by splitting the string into a list of words. In this method, instead of using the sets to remove any duplicate, we will create a function that will eliminate duplicate words from the list.

For example,

Output:

remove word from this

In the above example, the lst_unique() function ensures that every element of the list is unique.

Using the collections.OrderedDict class

The collections.OrderedDict class creates a dictionary by arranging the order of the elements. We store the elements as keys and combine them using the join() function.

For example,

Output:

remove word from this

Using the numpy.duplicate() function

The numpy.duplicate() function creates arrays from existing arrays, lists by eliminating the duplicate elements. We can use the list of words to create such an array of unique elements. After this, we will combine the elements using the join() function as done in the previous methods.

The downside of this method is that it sorts the element, so the original order of the string is lost.

See the code below.

Output:

from remove this word

Using the regular expressions

We can use regular expressions to detect sub-strings based on regular expression patterns. We can use regular expressions to remove consecutive duplicate words using some pattern.

We will use the re.sub() function to substitute the words that will match this pattern with the first occurrence of the word.

See the code below.

Output:

remove word from this

Conclusion

This article demonstrated how to remove word from String in Python. Let’s wrap up with the most straightforward methods discussed. The replace() and re.sub() function can remove a specific word from a string very easily. Other methods remove words from the start or end of the sentence. We also discussed how to remove duplicate words from a string in Python. The main approach to remove duplicate words was to split the string into an iterable, remove the duplicate items, and combine them into a string again.

In this python tutorial, we will discuss Python remove substring from a string and also cover the below points:

• Remove substring from string python regex
• Remove substring from string python DataFrame
• Python remove substring from string by index
• Remove duplicate substring from string python
• Remove the last substring from string python
• Remove multiple substrings from string python
• Remove the first substring from string python
• Remove substring from beginning of string python
• Python remove substring from a string if exists
• Remove a substring from a string python pandas
• How to remove all occurrences of a substring from a string in python
• Python remove substring from the middle of a string

A substring is a contiguous sequence of characters. We extract these substrings using the substring method.

• When you give the substring method one number the result in the section from that position to the end of the string.
• If you have two numbers, you get the section starting at the start index up to but not including the end position.
• For example, abcdef is a string where the cd is a substring of this string.

Syntax:

Here is the syntax of Substring

Str.substring(start)

Str.substring(start,end)

Python remove substring from a String

• In this section, we will learn how to remove substring from a string.
• Python removes a character from a string offers multiple methods by which we can easily remove substring from a string.
  • String replace()

String replace() method replaces a specified character with another specified character.

Syntax:

Here is the Syntax of String replace()

replace[
         old_Str1,
         new_Str2,
         instance
        ]

Let’s take an example to check how to remove substring from a string in Python.

str2="calfornia"
str3= str2.replace("a","")
print(str3)

Here is the screenshot of following given code.

This is how to remove substring from a String in Python.

Read: Python 3 string replace() method example

Remove substring from string python regex

• In this section, we will learn how to remove substring from string python regex.
• Regular Expression is basically used for describing a search pattern so you can use regular expression for searching a specific string in a large amount of data.
• You can verify that string has a proper format or not you can find a string and replace it with another string and you can even format the data into a proper form for importing so these are all uses of the regular expression.
• Now over here I have shown you an example here.
• There is a string that is present in which they have written George is 22 and Michael is 34. So as you can see what are useful data that I can find here only name and age.
• So what I can do I can identify a pattern with the help of regular expression.
• I can convert that to a dictionary.

Let’s take an example to check how to remove substring from string python regex.

import re
from typing import Pattern
new_str1 = "George"
pattern = r'[oe]'
mod1_str2 = re.sub(pattern, '', new_str1)
print(mod1_str2)

Here is the screenshot of following given code.

This is how to remove substring from string using regex in Python (python remove substring from string regex).

Read: Python compare strings

Remove substring from string python DataFrame

DataFrame is two dimensional and the size of the data frame is mutable potentially heterogeneous data. We can call it heterogeneous tabular data so the data structure which is a dataframe also contains a labeled axis which is rows and columns and arithmetic operation aligned on both rows and column tables. It can be thought of as a dictionary-like container.

• In this section, we will learn how to remove substring from string Python DataFrame.
• First, we have to create a DataFrame with one column that contains a string.
• Then we have to use a string replace() method to remove substring from a string in Python DataFrame.

Let’s take an example to check how to remove substring from string python DataFrame.

import pandas as pd

dt = {'ALPHABET':  ['a','z','f','h']
          
         }
df = pd.DataFrame(dt, columns= ['ALPHABET'])
df['ALPHABET'] = df['ALPHABET'].str.replace('a','')
print (df)

Here is the screenshot of following given code.

This is how to remove substring from string in Python DataFrame.

Read: Crosstab in Python Pandas

Python remove substring from string by index

Index String method is similar to the fine string method but the only difference is instead of getting a negative one with doesn’t find your argument.

• In this section, we will learn how to remove substring from string by index.b-1.
• Remove substring from a string by index we can easily use string by slicing method.
• String Slicing returns the characters falling between indices a and b.Starting at a,a+1,a+2..till b-1.

Syntax:

Here is the syntax of string slicing.

String
      [start:end:step_value]

Let’s take an example to check how to remove substring from string by index.

str1 = 'George'
str3 = str1[:2] + str1[3:]
print(str3)

Here is the screenshot of following given code.

This is how to remove substring from string by index in Python.

Read: Python 3 string methods with examples

Remove duplicate substring from string Python

Let’s take an example this is a given string ‘abacd’. Now you can see that ‘a’ is repeating two times and no other character is repeating. So after removing all the duplicates. The result will be a b c d’. The condition is that you need to remove all the duplicates provided the order should be maintained.

• In this section, we will learn how to remove duplicate substring from string python.
• Using set() +split() method to remove Duplicate substring.

Syntax:

Here is the Syntax of set() +split()

set[
    (sub.split(''))
    ]

Let’s take an example to check how to remove duplicate substring from string python.

str1 = ['u-u-k','mm-cc','bb-cc']
print("original string :" + str(str1))
result = [set(sub.split('-')) for sub in str1]
print(" string after duplicate removal :" + str(result))

Here is the screenshot of following given code.

The above Python code to remove duplicate substring from string in Python.

Read: Python NumPy arange

Remove last substring from string python

• In this section, we will learn how to remove the last substring from string Python.
• Using the Naive method On the off chance that the first letter of the provided substring matches, we start an inner loop to check if all components from the substring match with the successive components in the main string. That is, we just check whether the whole substring is available or not.

Let’s take an example to check how to remove the last substring from string Python.

str1 = 'Micheal'
str2 = 'eal'
print ("First_strings : ", str1, "nsubstring : ", str2) 
if str1.endswith(str2):
    result = str1[:-(len(str2))]
print ("Resultant string", result)

Here is the screenshot of following given code.

This is how to remove last substring from string in Python.

Read: Could not convert string to float Python

Remove first substring from string python

• In this section, we will learn how to remove the first substring from string python.
• Remove the first substring from the string we can easily use string by slicing method.
• String Slicing returns the characters falling between indices a and b.Starting at a,a+1,a+2..till b-1.

Syntax:

Here is the syntax of String Slicing.

String
      [start:end:step_value]

Let’s take an example to check how to remove the first substring from string python

str1 = "smith"
str2 = str1[2:]
print(str2)

Here is the screenshot of following given code.

The above Python code we can use to remove first substring from string in Python.

Read: Python NumPy append

Remove substring from beginning of string python

• In this section, we will learn how to remove substring from the beginning of string python.
• Using loop + remove() + startswith() remove substring from beginning of string.

Syntax:

Here is the syntax of loop + remove () +startswith()

for str in str1 [:]:
 if str.startswith[pref]:

Let’s take an example to check how to remove substring from beginning of string python.

str2="calfornia"
str3= str2.replace("c","")
print(str3)

Here is the screenshot of following given code.

Read: Python find substring in string + Examples

Python remove substring from a string if exists

• In this section, we will learn how to remove a substring from a string if exists.
• String replace() method remove substring from a string if exists.

Syntax:

Here is the syntax of string replace

replace[
         old_Str1,
         new_Str2,
         instance
        ]

Let’s take an example to check how to remove substring from a string if exists

str2="calfornia"
str3= str2.replace("a","")
print(str3)

Here is the screenshot of following given code.

This is how to remove substring from a string if exists in Python.

Remove a substring from a string python pandas

Pandas is a python library that is used for data manipulation analysis and cleaning. Python pandas are well-suited for different kinds of data such as we can work on tabular data.

• In this section, we will learn how to remove a substring from a String Python pandas.
• First, we have to create a Data Frame with one Column that contains a String.
• Then we have to use a string replace() method which specified character with another specified character.

String replace() method remove a substring from a string python pandas.

Syntax:

Here is the syntax of String replace()

Column name
           [
            replace[
        
        old_Str1,
        new_Str2,
        instance
       ]
]

Let’s take an example to check how to remove a substring from a string Python Pandas

import pandas as pd

dt = {'ALPHABET':  ['a','z','f','h']
          
         }
df = pd.DataFrame(dt, columns= ['ALPHABET'])
df['ALPHABET'] = df['ALPHABET'].str.replace('a','l')
print (df)

Here is the screenshot of following given code.

The above Python code, we can use to remove a substring from a string in python pandas.

Read: Could not convert string to float Python

How to remove all occurrences of a substring from a string in python

• In this section, we will learn how to remove all occurrences of a substring from a string in python.
• String translate() will change the string by replacing the character or by deleting the character. We have to mention the Unicode for the character and None as a replacement to delete it from the String.
• Use the String translate() method to remove all occurrences of a substring from a string in python.

Let’s take an example to check how to remove all occurrences of a substring from a string in python.

str1 = "Micheal"
print("Original string : " + str1)
# Using translate()
temp = str.maketrans("iche", "abcd")
str1 = str1.translate(temp)
print(" string after swap : " + str(str1)) 

Here is the screenshot of following given code.

The above Python code, we can use to remove all occurrences of a substring from a string in python.

Python remove substring from the middle of a string

• In this section, we will learn how to remove substring from the middle of a string.
• The string replace() method remove the substring from the middle of a string.

Syntax:

Here is the syntax of String replace

replace[
         old_Str1,
         new_Str2,
         instance
        ]

Let’s take an example to check how to remove substring from the middle of a string.

str1 = input("Enter the string").replace("the","")
print(str1)

Here is the screenshot of following given code

The above Python code, we can use to remove substring from the middle of a string in Python.

You may like the following Python tutorials:

• Slicing string in Python + Examples
• Convert string to float in Python
• Append to a string Python + Examples

In this python tutorial we learned about how to remove substring from a String in Python with the below examples:

• How to remove substring from a String in Python
• Remove substring from string python regex
• How to remove substring from string python DataFrame
• Python remove substring from string by index
• How to remove duplicate substring from string Python
• Remove last substring from string python/
• How to remove first substring from string python
• Remove substring from beginning of string python
• Python remove substring from a string if exists
• Remove a substring from a string python pandas
• How to remove all occurrences of a substring from a string in python
• Python remove substring from the middle of a string