yourself with the extension's features, you can checkout the extension walkthrough by opening the Command Palette (<kbd>Ctrl</kbd> + <kbd>Shift</kbd> + <kbd>P</kbd> or on macOS: <kbd>Cmd</kbd> + <kbd>Shift</kbd> + <kbd>P</kbd>) and selecting "Welcome: Open walkthrough..." and then choosing the "Get started with FastAPI" walkthrough....

It will then start the server with your **FastAPI** code, stop at your breakpoints, etc.

Here's how it might look:

<img src="/img/tutorial/debugging/image01.png">

---

If you use Pycharm, you can:

* Open the "Run" menu.
* Select the option "Debug...".
* Then a context menu shows up.
* Select the file to debug (in this case, `main.py`).

    @DisplayName("Lifecycle and exception mapping")
    class LifecycleAndExceptions {

        @Test
        @DisplayName("open() acquires handle and closes it")
        void openDelegatesEnsureOpenAndCloses() throws Exception {
            SmbFileInputStream in = newStream();
            in.open();
            // ensureOpen returns acquired handle; try-with-resources must close it
            verify(mockHandle, times(1)).close();

	PutMultiple(item []I) (Key, error)
	Get(key Key) (I, error)
	GetMultiple(key Key) ([]I, error)
	GetRaw(key Key) ([]byte, error)
	PutRaw(b []byte) (Key, error)
	Len() int
	List() []Key
	Del(key Key) error
	Open() error
	Delete() error
}

// Key denotes the key present in the store.
type Key struct {
	Name      string
	Compress  bool
	Extension string
	ItemCount int
}

// String returns the filepath name

 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package okhttp3

import kotlin.reflect.KClass
import okio.Timeout

open class FailingCall : Call {
  override fun request(): Request = error("unexpected")

  override fun execute(): Response = error("unexpected")

  override fun enqueue(responseCallback: Callback): Unit = error("unexpected")

 *
 * <p>See the Guava User Guide article on <a
 * href="https://github.com/google/guava/wiki/CachesExplained">caches</a>.
 *
 * <p>This package is a part of the open-source <a href="https://github.com/google/guava">Guava</a>
 * library.
 *
 * @author Charles Fry
 */
@CheckReturnValue
@NullMarked
package com.google.common.cache;

 * Side Public License, v 1.
 */

import org.elasticsearch.gradle.VersionProperties
import org.elasticsearch.gradle.testclusters.RunTask

// gradle has an open issue of failing applying plugins in
// precompiled script plugins (see https://github.com/gradle/gradle/issues/17004)
// apply plugin: 'elasticsearch.internal-testclusters'

testClusters.register("runTask") {

          <type>DOM</type>
          <description>
            Toolchain identification information, which will be matched against project requirements.
            &lt;p>Actual content structure is completely open: each toolchain type will define its own format and
            semantics.
            &lt;p>This is generally a properties format: {@code &lt;name&gt;value&lt;/name&gt;} with predefined
            properties names.

	Compress bool
}

// Writer is a concurrency-safe writer with file rotation.
type Writer struct {
	// opts are the configuration options for this Writer
	opts Options

	// f is the currently open file used for appends.
	// Writes to f are only synchronized once Close() is called,
	// or when files are being rotated.
	f *os.File

	pw *xioutil.PipeWriter
	pr *xioutil.PipeReader
}

/*
 * Copyright (C) 2011 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,