Answers by Sentry

How do I remove a trailing newline from a string in Python

David Y.

The Problem

Using Python, how can I remove one or more newline characters at the end of a string, if present?

The Solution

Python provides the string method rstrip for this purpose. By default, it will remove trailing newlines, carriage returns, and spaces.

my_string = "Hello world! \r\n\n"
my_string = my_string.rstrip()  # will produce "Hello world!"

We can optionally provide a specific set of characters for rstrip to remove. So, to remove only trailing newlines, leaving all other characters intact, we can write the following:

my_string = "Hello world! \r\n\n"
my_string = my_string.rstrip("\n") # will produce "Hello world! \r"

We can use any number of characters in any order here and they will be removed from the end of the string. For example:

my_string = "Hello world! \r\n\n"
my_string = my_string.rstrip("\n\r !d") # will produce "Hello worl"

Python also provides an lstrip method, which performs the same operation on leading characters, and strip, which removes leading and trailing characters from the string. For example:

my_string = "\r\n\n Hello world! \r\n\n"
my_string = my_string.lstrip() # will be "Hello world! \r\n\n"

my_string = "\r\n\n Hello world! \r\n\n"
my_string = my_string.rstrip() # will be "\r\n\n Hello world!"

my_string = "\r\n\n Hello world! \r\n\n"
my_string = my_string.strip() # will be "Hello world!"

We can use lstrip and rstrip together to remove leading and trailing characters while preserving characters in the middle of the string, as below:

my_string = "\r\n\n Hello world! \r\n\n"
my_string = my_string.lstrip().rstrip() # will be "Hello world!"

Get Started With Sentry

Get actionable, code-level insights to resolve Python performance bottlenecks and errors.

  1. Create a free Sentry account

  2. Create a Python project and note your DSN

  3. Grab the Sentry Python SDK

pip install --upgrade sentry-sdk
  1. Configure your DSN
import sentry_sdk

sentry_sdk.init(
    "https://<key>@sentry.io/<project>",

    # Set traces_sample_rate to 1.0 to capture 100%
    # of transactions for performance monitoring.
    # We recommend adjusting this value in production.
    traces_sample_rate=1.0,
)

Loved by over 4 million developers and more than 90,000 organizations worldwide, Sentry provides code-level observability to many of the world’s best-known companies like Disney, Peloton, Cloudflare, Eventbrite, Slack, Supercell, and Rockstar Games. Each month we process billions of exceptions from the most popular products on the internet.

learn more about sentryjoin our discord
Share on Twitter
Bookmark this page
Ask a questionJoin the discussion

Related Answers

A better experience for your users. An easier life for your developers.

Try Sentry For FreeRequest a Demo
    TwitterGitHubDribbbleLinkedinDiscord
© 2024 • Sentry is a registered Trademark
of Functional Software, Inc.