How to Remove Commas from a String Python

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How to remove commas from a string in Python? To remove commas from a string you can use multiple approaches of Python. You can use some of the approaches such as replace(), for loop, re.sub(), translate() & maketrans() and list comprehension & join() functions to remove the commas from the string. In this article, I will explain how to remove commas from a string by using all these functions with examples.

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Related: In Python you can also remove punctuation from the string.

1. Quick Examples of Removing Commas from a String

If you are in a hurry, below are some quick examples of removing commas from a string.


# Quick examples of removing commas from a string

import re

# Initialize the string
string = "Welcome, To, SparkByExamples,"

# Example 1: Using replace() method
result = string.replace(",","")

# Example 2: Using replace() method
result = string.replace(",", "", 1)

# Example 3: Using for loop
result = ""
for alphabet in string:
  if alphabet != ",":
    result = result + alphabet

# Example 4: Using re.sub() method
result = re.sub(",","",string)

# Example 5: Using the translate() and maketrans() methods 
translation_table = str.maketrans("", "", ",")  
result = string.translate(translation_table)

# Example 6: Using a list comprehension and join() method 
result =''.join(char for char in string if char != ',')

2. String replace() Method

The string replace() method is a built-in method that allows you to replace substrings within a string.

2.1 Syntax of String replace()

The following is the syntax of the String replace() function.


# Syntax of string replace()
string.replace(old, new, count)

2.2 Parameters of String replace()

It takes three parameters.

  • old – This is the substring you want to replace in the original string.
  • new – This is the new substring that you want to put in place of the old substring.
  • count – (optional): This parameter specifies the maximum number of occurrences to replace. If omitted, all occurrences of the old substring will be replaced.

2.3 Return value

It returns the string with replaced substrings.

3. Remove Commas from the String using replace()

You can remove commas from a string using the replace() method, you can simply call the replace() function on the string and pass a comma(“,”) as the first argument and an empty string(“”) as the second argument. This will replace all occurrences of commas in the string with nothing effectively removing them.

In the below example, the replace() method is used to remove all commas from the string, and the result is stored in the result. The replace() method is a simple and effective way to achieve this.


# Initialize string
string = "Welcome, To, SparkByExamples,"
print("Original string: ", string)

# Using replace() method
# Removing commas from a string
result = string.replace(",", "")
print("After removing commas from a string :",result)

Yields below output.

python remove commas string

The commas have been successfully removed from the original string, leaving you with the desired output.

If you want to remove only the first occurrence of a comma within a string, you can use the replace() method with the count parameter set to 1. This will ensure that only the first occurrence is replaced.

In the below example, you set the count parameter to 1, which means only the first occurrence of the comma is replaced with an empty string, effectively removing it. The remaining commas in the string are left unchanged.


# Using replace() method
result = string.replace(",", "", 1)
print("After removing commas from a string :",result)

Yields below output.

python remove commas string

4. Remove Commas From the String Using For Loop

Alternatively, you can use a for loop to remove commas from a string. For example, first, the original string is defined, as "Welcome, To, SparkByExamples,". A variable result is initialized as an empty string, where you will store the characters of the original string without commas.

The for loop iterates over each character of the string. Inside the loop, there is an if condition that checks if the character is not a comma (‘,’). If the character is not a comma, it is appended to the result string. The loop continues until all characters in the original string are processed. After the loop, the final result string contains the original string without commas.


# Initialize string
string = "Welcome, To, SparkByExamples,"
print("Original string: ", string)

# Using for loop
# Remove commas from string 
result = ""
for alphabet in string:
  if alphabet != ",":
    result = result + alphabet
print("After removing commas from a string :",result)

# Output:
# Original list:  Welcome, To, SparkByExamples,
# After removing commas from a string : Welcome To SparkByExamples

5. Remove Commas From String Using re.sub() Method

To remove commas from a string using the re.sub() method in Python, you’ll need to use the re module, which provides support for regular expressions.

In the below example, the re.sub() method is used to replace all occurrences of commas(','), specified by the regular expression ",", with an empty string "". The re.sub() method searches for the regular expression pattern in the string and replaces it with the specified replacement (empty string in this case).


import re

# Initialize string
string = "Welcome, To, SparkByExamples,"
print("Original string: ", string)

# Using re.sub() method
# Remove commas from string 
result = re.sub(",","",string)
print("After removing commas from a string :",result)

Yields the same output as above.

6. Using the translate() and maketrans() Methods

You can also use the translate() method along with the maketrans() method to remove commas from a string in Python.

In the below example, the str.maketrans() method is used to create a translation table. The translation table is a mapping of characters to be replaced. In this case, you want to replace commas(','), so you map them to an empty string "". Then, the translate() method is used with the created translation table to remove the characters specified in the translation table from the original string.


# Initialize string
string = "Welcome, To, SparkByExamples,"
print("Original string: ", string)

# Using the translate() and maketrans() methods 
# Remove commas from string
translation_table = str.maketrans("", "", ",")  
# Use translate() to remove commas
result = string.translate(translation_table)
print("After removing commas from a string :",result)

Yields the same output as above.

7. Using a List Comprehension and join() Method

You can also use a list comprehension along with the join() method to remove commas from a string in Python. The join() method takes an iterable (in this case, the characters generated by the list comprehension) and joins them into a single string without any separators (since an empty string ',' is used as the separator in this case). The list comprehension filters out commas from the original string and then join() combines the remaining characters to form the final string without commas.


# Initialize string
string = "Welcome, To, SparkByExamples,"
print("Original string: ", string)

# Using a list comprehension and join() method 
result =''.join(char for char in string if char != ',')
print("After removing commas from a string :",result)

Yields the same output as above.

8. Conclusion

In this article, I have explained how to remove commas from a string in Python by using the replace(), for loop, re.sub(), translate() & maketrans(), and list comprehension & join() functions with examples.

Happy Learning !!

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