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Removing a trailing newline in Python

How can I remove a trailing newline in python?

A trailing new line is a ’\n’ character at the end of a line like that in Python strings. In this article let’s learn how we can remove this trailing newline.

  • Using rstrip
  • Using strip()
  • Using replace()
  • Using regex

 

1. Using strip():

This string method removes the trailing and leading characters which may also have whitespaces from a string.

 

Example:

string_eg = "     Python by i2 tutorials     "

string_trim = string_eg.strip()

print("The Original String:", string_eg)
print("String after trimming:", string_trim)

output:

 

2. Using rstrip():

The rstrip() method removes the trailing characters from a string and returns a copy of this trimmed string.

 

Example:

string_eg = "     Python by i2 tutorials     "

string_trim = string_eg.rstrip()

print("The Original String:", string_eg)
print("String after trimming:", string_trim)

output:

 

3. Using replace():

We check for ’\n’ as a string and replace it using a for loop and replace() method. 

 

Example:

demo_list = ["Python\n", "b\ny", "i2tutorials\n\n"]

list_trimmed = []

for x in demo_list:
    list_trimmed.append(x.replace("\n", ""))

print("Original List : " + str(demo_list))
print("Trimmed List : " + str(list_trimmed))

output:

 

4. Using Regex:

A Regular Expression[RegEx] pattern is a five-letter string that starts with ‘a’ and ends with ‘s’.

^a...s$

 

We first have to import re module to work with these regular expressions.

 

Example:

import re

string_eg = "     Python by i2 tutorials     "
string_trim = re.sub(r'^\s+$', '', string_eg)

print("The Original String:", string_eg)
print("String after trimming:", string_trim)

output:

 

The sub() method performs a global replacement of all the newline characters with an empty string. This method checks for every occurrence of a newline character .

 

In the regex expression, ^ is known as caret which denotes if a string is starting with a specific character or not. \s denotes a whitespace and | denotes the or operation. $ is known as a dollar which denotes if a string is ending with a specific character or not. +(Plus) symbol matches one or more occurrences of the pattern left to it.

 

Look at a much simpler example below

 

Example:

import re
demo_list = ["Python\n", "b\ny", "i2tutorials\n\n"]

list_trimmed = []

for x in demo_list:
    list_trimmed.append(re.sub("\n", ""))

print("Original List : " + str(demo_list))
print("Trimmed List : " + str(list_trimmed))

output:

 

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