## Description from docstring { #description-from-docstring }

As descriptions tend to be long and cover multiple lines, you can declare the *path operation* description in the function <abbr title="a multi-line string as the first expression inside a function (not assigned to any variable) used for documentation">docstring</abbr> and **FastAPI** will read it from there.

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* *路径*可以包含 <a href="https://github.com/OAI/OpenAPI-Specification/blob/master/versions/3.0.2.md#key-expression" class="external-link" target="_blank">OpenAPI 3 表达式</a>（详见下文），可以使用带参数的变量，以及发送至您的 API 的原始请求的部分

### 回调路径表达式

回调*路径*支持包含发送给您的 API 的原始请求的部分的  <a href="https://github.com/OAI/OpenAPI-Specification/blob/master/versions/3.0.2.md#key-expression" class="external-link" target="_blank">OpenAPI 3 表达式</a>。

本例中是**字符串**：

```Python

	exp, err := ParseSelectStatement("select _3,_1,_2 as 'mytest'  from S3object")
	if err != nil {
		t.Fatalf("parse alias sql error: %v", err)
	}
	if exp.selectAST.Expression.Expressions[2].As != "mytest" {
		t.Fatalf("parse alias sql error: %s not equal %s", exp.selectAST.Expression.Expressions[2].As, err)
	}

    @Resource
    protected DictionaryManager dictionaryManager;

    /**
     * Creates a new DictionaryCreator with the specified pattern.
     *
     * @param pattern the regular expression pattern to match file paths
     */
    protected DictionaryCreator(final String pattern) {
        this.pattern = Pattern.compile(pattern);
    }

    /**

import org.codehaus.plexus.component.configurator.converters.lookup.DefaultConverterLookup;
import org.codehaus.plexus.component.configurator.expression.ExpressionEvaluationException;
import org.codehaus.plexus.component.configurator.expression.ExpressionEvaluator;
import org.codehaus.plexus.configuration.PlexusConfiguration;
import org.codehaus.plexus.configuration.xml.XmlPlexusConfiguration;

		if !isDryRun {
			return
		}

		ok, mode := hasReturning(db, supportReturning)
		if ok {
			if c, ok := db.Statement.Clauses["ON CONFLICT"]; ok {
				onConflict, _ := c.Expression.(clause.OnConflict)
				if onConflict.DoNothing {
					mode |= gorm.ScanOnConflictDoNothing
				} else if len(onConflict.DoUpdates) > 0 || onConflict.UpdateAll {
					mode |= gorm.ScanUpdate
				}
			}

    }

    /**
     * Retrieves a list of XPath nodes from the document.
     *
     * @param doc The XML document.
     * @param xpath The XPath expression.
     * @return A list of XPath nodes.
     * @throws XPathExpressionException if an XPath expression error occurs.
     */
    protected XPathNodes getNodeList(final Document doc, final String xpath) throws XPathExpressionException {

     * (java.lang.String)
     */
    /**
     * Retrieves a list of URL patterns to be excluded for a given session.
     * @param sessionId The ID of the session.
     * @return A list of compiled regular expression patterns.
     */
    @Override
    public List<Pattern> getExcludeUrlPatternList(final String sessionId) {
        return dataHelper.getExcludeUrlPatternList(sessionId);
    }

    private static final Pattern SPACE_PATTERN = Pattern.compile("\\s+", Pattern.MULTILINE);

    /**
     * A map of field rules, where the key is the field name and the value is the XPath expression.
     */
    protected Map<String, String> fieldRuleMap = new LinkedHashMap<>();

    /** Flag to enable or disable trimming of whitespace characters. */
    protected boolean trimSpaceEnabled = true;