Activating a virtual environment also changes a couple of other things, but this is one of the most important things it does.

## Checking a Virtual Environment { #checking-a-virtual-environment }

When you check if a virtual environment is active, for example with:

//// tab | Linux, macOS, Windows Bash

<div class="termy">

```console
$ which python

	if i.debug {
		if oi.VersionID != "" {
			console.Debugf(applyActionsLogPrefix+" heal checking: %v/%v v(%s)\n", i.bucket, i.objectPath(), oi.VersionID)
		} else {
			console.Debugf(applyActionsLogPrefix+" heal checking: %v/%v\n", i.bucket, i.objectPath())
		}
	}
	scanMode := madmin.HealNormalScan
	if i.heal.bitrot {
		scanMode = madmin.HealDeepScan
	}

     *
     * @return <code>true</code> if the resource exists or is alive or
     *         <code>false</code> otherwise
     * @throws SmbException if an error occurs while checking existence
     */

    public boolean exists() throws SmbException {

        if (attrExpiration > System.currentTimeMillis()) {
            return isExists;
        }

    if (handleNullAutomatically) {
      // TODO(kevinb): we shouldn't be checking for a null result at runtime. Assert?
      return a == null ? null : checkNotNull(doForward(a));
    } else {
      return unsafeDoForward(a);
    }
  }

  @Nullable A correctedDoBackward(@Nullable B b) {
    if (handleNullAutomatically) {
      // TODO(kevinb): we shouldn't be checking for a null result at runtime. Assert?

                    update = updateCheckManager.isUpdateRequired(metadata, repository, file);
                }

                if (update) {
                    getLogger().info(metadata.getKey() + ": checking for updates from " + repository.getId());
                    try {
                        wagonManager.getArtifactMetadata(metadata, repository, file, policy.getChecksumPolicy());

                responseData.setCharSet(charset);
                responseData.setContentLength(0);
            } else if (file.isFile()) {
                if (logger.isDebugEnabled()) {
                    logger.debug("Checking SmbFile Size: {}", filePath);
                }
                responseData.setContentLength(file.length());
                checkMaxContentLength(responseData);

                        // page), so we'll try this up to two times. On the second try, we'll handle it as a bona-fide
                        // error, based on the repository's checksum checking policy.
                        if (firstRun) {
                            logger.warn("*** CHECKSUM FAILED - " + e.getMessage() + " - RETRYING");
                            retry = true;
                        } else {

    $env:PATH = [Environment]::GetEnvironmentVariable('PATH', 'Machine') + ';C:\tools\msys64;C:\tools\msys64\usr\bin\'; \
    [Environment]::SetEnvironmentVariable('PATH', $env:PATH, 'Machine');

# Disable signature checking on pacman because we cannot initialize the keyring.
RUN Add-Content -Path C:\tools\msys64\etc\pacman.d\mirrorlist.mingw32 -Value 'SigLevel = Never'

            logger.warn("Failed to write a sugget elevate word.", e);
        }
    }

    /**
     * Safely retrieves a value from a list at the specified index, handling bounds checking
     * and cleaning up quoted strings.
     *
     * @param list the list to retrieve the value from
     * @param index the index of the value to retrieve

---

The main point is, **none** of these are **rules written in stone** that you have to blindly follow. You can use these ideas to **evaluate your own use case** and decide what is the best approach for your system, checking out how to manage the concepts of:

* Security - HTTPS
* Running on startup
* Restarts
* Replication (the number of processes running)
* Memory
* Previous steps before starting

## Memory { #memory }