Because the editor knows the types of the variables, you don't only get completion, you also get error checks:

<img src="/img/python-types/image04.png">

Now you know that you have to fix it, convert `age` to a string with `str(age)`:

{* ../../docs_src/python_types/tutorial004_py310.py hl[2] *}

## Declaring types { #declaring-types }

You just saw the main place to declare type hints. As function parameters.

            f.set(c, val);
        } catch (Exception e) {
            throw new AssertionError(e);
        }
    }

    // Helper to build a minimal smb URL
    private static URL smbUrl(String spec) throws Exception {
        return new URL(null, spec, new Handler());
    }

    @Test
    @DisplayName("getConfig returns context config")
    void getConfig_returnsConfig() {

### Dependency Injection { #dependency-injection }

FastAPI includes an extremely easy to use, but extremely powerful <dfn title='also known as "components", "resources", "services", "providers"'><strong>Dependency Injection</strong></dfn> system.

* Even dependencies can have dependencies, creating a hierarchy or **"graph" of dependencies**.
* All **automatically handled** by the framework.

        self.remaining_points = remaining
        self.reset_at = datetime.fromisoformat(reset_at.replace("Z", "+00:00"))


rate_limiter = RateLimiter()


discussions_query = """
query Q($after: String, $category_id: ID) {
  repository(name: "fastapi", owner: "fastapi") {
    discussions(first: 30, after: $after, categoryId: $category_id) {
      edges {
        cursor
        node {
          number

}} {{- end }} {{- end }} {{- range $key, $val := .Values.environment }} - name: {{ $key }} value: {{ tpl $val $ | quote }} {{- end }} resources: {{- toYaml .Values.resources | nindent 12 }} {{- with .Values.extraContainers }} {{- if eq (typeOf .) "string" }} {{- tpl . $ | nindent 8 }} {{- else }} {{- toYaml . | nindent 8 }} {{- end }} {{- end }} {{- with .Values.nodeSelector }} nodeSelector: {{- toYaml . | nindent 8 }} {{- end }} {{- include "minio.imagePullSecrets" . | indent 6 }} {{- with .Values.affinity...

      <span style="background-color:#007166"><font color="#D3D7CF"> app </font></span>  Using import string: <font color="#3465A4">main:app</font>

     *
     * crc0 = ~int0
     * crc1 = int1
     * crc2 = int2
     * crc3 = int3
     *
     * ...so we set crc0 so that computeForWord(crc0) = -1 and xoring it with the first int
     * gives us the desired result.  computeForWord(0) == 0, so all the others do the right thing.
     */
    private int crc0 = INVERSE_COMPUTE_FOR_WORD_OF_ALL_1S;
    private int crc1 = 0;
    private int crc2 = 0;
    private int crc3 = 0;

   *     arbitrary past or present time
   */
  abstract long reserveEarliestAvailable(int permits, long nowMicros);

  @Override
  public String toString() {
    return String.format(Locale.ROOT, "RateLimiter[stableRate=%3.1fqps]", getRate());
  }

  abstract static class SleepingStopwatch {
    /** Constructor for use by subclasses. */
    protected SleepingStopwatch() {}

      Unit
    }

    if (noNewExchangesEvent) {
      connectionListener.noNewExchanges(this)
    }
  }

  override fun protocol(): Protocol = protocol

  override fun toString(): String =
    "Connection{${route.address.url.host}:${route.address.url.port}," +
      " proxy=${route.proxy}" +
      " hostAddress=${route.socketAddress}" +
      " cipherSuite=${handshake?.cipherSuite ?: "none"}" +

     *            context to use
     * @throws SmbException if an SMB error occurs
     * @throws MalformedURLException if the URL is malformed
     */
    @SuppressWarnings("resource")
    public SmbFileInputStream(final String url, final CIFSContext tc) throws SmbException, MalformedURLException {
        this(new SmbFile(url, tc), 0, SmbConstants.O_RDONLY, SmbConstants.DEFAULT_SHARING, true);
    }

    /**