assertArgumentNotNull("converter", converter);

        if (isEmpty(propertyNames)) {
            converters.add(converter);
        } else {
            for (final CharSequence name : propertyNames) {
                assertArgumentNotEmpty("element of propertyNames", name);
                converterMap.put(name.toString(), converter);
            }
        }

            if (pos == 0) {
                buf.append(toText);
                pos2 = fromText.length();
            } else if (pos > 0) {
                buf.append(text.substring(pos2, pos));
                buf.append(toText);
                pos2 = pos + fromText.length();
            } else {
                buf.append(text.substring(pos2));
                break;
            }
        }

		// slice. We only need m+n <= c to slide, but
		// we instead let capacity get twice as large so we
		// don't spend all our time copying.
		copy(b.buf, b.buf[b.off:])
	} else if c > maxInt-c-n {
		panic(ErrTooLarge)
	} else {
		// Add b.off to account for b.buf[:b.off] being sliced off the front.
		b.buf = growSlice(b.buf[b.off:], b.off+n)
	}
	// Restore b.off and len(b.buf).
	b.off = 0
	b.buf = b.buf[:m+n]

)

type Config struct {
	TraceLogging bool `json:"IPTABLES_TRACE_LOGGING"`
	EnableIPv6   bool `json:"ENABLE_INBOUND_IPV6"`
	RedirectDNS  bool `json:"REDIRECT_DNS"`
	// If true, TPROXY will be used for redirection. Else, REDIRECT will be used.
	// Currently, this is treated as a feature flag, but may be promoted to a permanent feature if there is a need.
	TPROXYRedirection bool `json:"TPROXY_REDIRECTION"`
}

type IptablesConfigurator struct {

                        : targetName.toUpperCase().getBytes(getOEMEncoding());
                size += targetBytes.length;
            }
            else {
                flags &= ( 0xffffffff ^ NTLMSSP_REQUEST_TARGET );
            }
        }

        if ( targetInformationBytes != null ) {
            size += targetInformationBytes.length;

                            create3.chain(new Smb2CloseRequest(sess.getConfig(), Smb2Constants.UNSPECIFIED_FILEID));
                        }
                        else {
                            e.printStackTrace();
                            fail("Failed to interrupt sendrecv");
                        }
                    }
                }
            }
        }

So, a Python class is also a **callable**.

Then, in **FastAPI**, you could use a Python class as a dependency.

What FastAPI actually checks is that it is a "callable" (function, class or anything else) and the parameters defined.

		// Initiate a list objects operation inside a zip file based in the input params
		listObjectsV2Info, err = listObjectsV2InArchive(ctx, objectAPI, bucket, prefix, token, delimiter, maxKeys, startAfter, r.Header)
	} else {
		// Initiate a list objects operation based on the input params.
		// On success would return back ListObjectsInfo object to be
		// marshaled into S3 compatible XML header.

	msg := sarama.ProducerMessage{
		Topic: h.kconfig.Topic,
		Value: sarama.ByteEncoder(logJSON),
	}
	_, _, err = h.producer.SendMessage(&msg)
	if err != nil {
		atomic.StoreInt32(&h.status, statusOffline)
	} else {
		atomic.StoreInt32(&h.status, statusOnline)
	}
	return err
}

// Init initialize kafka target
func (h *Target) init() error {
	if os.Getenv("_MINIO_KAFKA_DEBUG") != "" {

	// Parse the nanoseconds.
	if strings.Trim(sn, "0123456789") != "" {
		return time.Time{}, ErrHeader
	}
	if len(sn) < maxNanoSecondDigits {
		sn += strings.Repeat("0", maxNanoSecondDigits-len(sn)) // Right pad
	} else {
		sn = sn[:maxNanoSecondDigits] // Right truncate
	}
	nsecs, _ := strconv.ParseInt(sn, 10, 64) // Must succeed
	if len(ss) > 0 && ss[0] == '-' {
		return time.Unix(secs, -1*nsecs), nil // Negative correction
	}