* @see ArtifactCoordinates#getClassifier()
     */
    @Nonnull
    String getClassifier();

    /**
     * Returns the file extension of the artifact.
     * The dot separator is not included in the returned string.
     *
     * @return the file extension or an empty string if none, never {@code null}
     * @see ArtifactCoordinates#getExtension()
     */
    @Nonnull

#### How relative imports work { #how-relative-imports-work }

/// tip

If you know perfectly how imports work, continue to the next section below.

///

A single dot `.`, like in:

```Python
from .dependencies import get_token_header
```

would mean:

            // groupId:artifactId:goal or pluginPrefix:version:goal (since Maven 3.9.0)

            String firstToken = tok[0];
            // groupId or pluginPrefix? heuristics: groupId contains dot (.) but not pluginPrefix
            if (firstToken.contains(".")) {
                // We have everything that we need except the version
                //

# U+200B, U+2060, and U+FEFF, are ignored
http://GOO\u200b\u2060\ufeffgoo.com  s:http p:/ h:googoo.com

# Ideographic full stop (full-width period for Chinese, etc.) should be
# treated as a dot.
# U+3002 is mapped to U+002E (dot)
http://www.foo\u3002bar.com  s:http p:/ h:www.foo.bar.com

# Invalid unicode characters should fail...
# U+FDD0 is disallowed; %ef%b7%90 is U+FDD0
http://\ufdd0zyx.com

    // Mixed case.
    checkPublicSuffix("COM", null)
    checkPublicSuffix("example.COM", "example.com")
    checkPublicSuffix("WwW.example.COM", "example.com")
    // Leading dot.
    checkPublicSuffix(".com", null)
    checkPublicSuffix(".example", null)
    checkPublicSuffix(".example.com", null)
    checkPublicSuffix(".example.example", null)
    // Unlisted TLD.

```

#### Windows (regular user)

On windows you would need to use [Docker integrated windows authentication](https://success.docker.com/article/modernizing-traditional-dot-net-applications#integratedwindowsauthentication) and [Create a container with Active Directory Support](https://blogs.msdn.microsoft.com/containerstuff/2017/01/30/create-a-container-with-active-directory-support/)

// https://www.iana.org/domains/root/db/dog.html
dog

// domains : Binky Moon, LLC
// https://www.iana.org/domains/root/db/domains.html
domains

// dot : Dish DBS Corporation
// https://www.iana.org/domains/root/db/dot.html
dot

// download : dot Support Limited
// https://www.iana.org/domains/root/db/download.html
download

// drive : Charleston Road Registry Inc.

This practice is common enough that it has a name, these environment variables are commonly placed in a file `.env`, and the file is called a "dotenv".

/// tip

A file starting with a dot (`.`) is a hidden file in Unix-like systems, like Linux and macOS.

But a dotenv file doesn't really have to have that exact filename.

///

	}{
		{
			name:  "Select a column containing dot",
			query: `select "na.me" from S3Object s`,
			wantResult: `apple
mango`,
		},
		{
			name:       "Select column containing dot with table name prefix",
			query:      `select count(S3Object."na.me") from S3Object`,
			wantResult: `2`,
		},
		{
			name:  "Select column containing dot with table alias prefix",

Was it `upper`? Was it `uppercase`? `first_uppercase`? `capitalize`?

Then, you try with the old programmer's friend, editor autocompletion.

You type the first parameter of the function, `first_name`, then a dot (`.`) and then hit `Ctrl+Space` to trigger the completion.

But, sadly, you get nothing useful:

<img src="/img/python-types/image01.png">

### Add types { #add-types }