For example:

* <a href="https://code.visualstudio.com/docs/python/environments#_select-and-activate-an-environment" class="external-link" target="_blank">VS Code</a>
* <a href="https://www.jetbrains.com/help/pycharm/creating-virtual-environment.html" class="external-link" target="_blank">PyCharm</a>

/// tip

You normally have to do this only **once**, when you create the virtual environment.

///

    checkArgument(validateSyntax(parts), "Not a valid domain name: '%s'", name);
  }

  /**
   * Internal constructor that skips validations when creating an instance from parts of an
   * already-validated InternetDomainName, as in {@link ancestor}.
   */
  private InternetDomainName(String name, ImmutableList<String> parts) {

* Changed ext3/ext4 volume creation to not reserve any portion of the volume for the root user. When creating ext3/ext4 volume, mkfs defaults to reserving 5% of the volume for the super-user (root). This patch changes the mkfs to pass -m0 to disable this setting.

- Endpoints resources created by the Endpoints controller now have a label indicating this.
  (Users creating Endpoints by hand _can_ also add this label themselves, but they ought
  to switch to creating EndpointSlices rather than Endpoints anyway.) ([#130564](https://github.com/kubernetes/kubernetes/pull/130564), [@danwinship](https://github.com/danwinship)) [SIG Apps and Network]

// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

// Package bufio implements buffered I/O. It wraps an io.Reader or io.Writer
// object, creating another object (Reader or Writer) that also implements
// the interface but provides buffering and some help for textual I/O.
package bufio

import (
	"bytes"
	"errors"
	"io"
	"strings"
	"unicode/utf8"
)

   * Double#NEGATIVE_INFINITY} only, the result is {@link Double#NEGATIVE_INFINITY}.
   *
   * <p>If you only want to calculate the mean, use {@link #meanOf} instead of creating a {@link
   * Stats} instance.
   *
   * @throws IllegalStateException if the dataset is empty
   */
  public double mean() {
    checkState(count != 0);
    return mean;
  }

  /**

### SIG Apps

- The service controller will now retry creating the load balancer when `persistUpdate` fails due to conflict. ([#68087](https://github.com/kubernetes/kubernetes/pull/68087), [@grayluck](https://github.com/grayluck))

### Expanded CLI support for debugging workloads and nodes

SIG CLI expanded on debugging with `kubectl` to support two new debugging workflows: debugging workloads by creating a copy, and debugging nodes by creating a container in host namespaces. These can be convenient to:
 - Insert a debug container in clusters that don’t have ephemeral containers enabled 

 * acquisition order.
 *
 * <p>Potential deadlocks detected when calling the {@code lock()}, {@code lockInterruptibly()}, or
 * {@code tryLock()} methods will result in the execution of the {@link Policy} specified when
 * creating the factory. The currently available policies are:
 *
 * <ul>
 *   <li>DISABLED
 *   <li>WARN
 *   <li>THROW
 * </ul>
 *

    checkArgument(columnIndex != null, "Column %s not in %s", columnKey, columnList);
    return set(rowIndex, columnIndex, value);
  }

  /*
   * TODO(jlevy): Consider creating a merge() method, similar to putAll() but
   * copying non-null values only.
   */

  /**
   * {@inheritDoc}
   *