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

## Simple usage { #simple-usage }

If you look at it, *path operation functions* are declared to be used whenever a *path* and *operation* matches, and then **FastAPI** takes care of calling the function with the correct parameters, extracting the data from the request.

Actually, all (or most) of the web frameworks work in this same way.

Similarly, you cannot redefine a path operation:

{* ../../docs_src/path_params/tutorial003b_py39.py hl[6,11] *}

The first one will always be used since the path matches first.

## Predefined values { #predefined-values }

	if err != nil {
		return err
	}
	*ef = BatchJobExpireFilter(tmp)
	ef.line, ef.col = value.Line, value.Column
	return err
}

// Matches returns true if obj matches the filter conditions specified in ef.
func (ef BatchJobExpireFilter) Matches(obj ObjectInfo, now time.Time) bool {
	switch ef.Type {
	case BatchJobExpireObject:
		if obj.DeleteMarker {
			return false
		}
	case BatchJobExpireDeleted:

        mockedStatic = mockStatic(GSSManager.class);
        mockedStatic.when(GSSManager::getInstance).thenReturn(gssManager);

        // Setup mock behavior for GSSManager with lenient matchers
        lenient().when(gssManager.createName(anyString(), any(), any())).thenReturn(serviceName);
        lenient().when(gssManager.createName(anyString(), any())).thenReturn(serviceName);

			continue
		}
		if !meta.IsValid() {
			inconsistent++
			continue
		}
		if meta.XLV1 != fi.XLV1 {
			inconsistent++
			continue
		}
		// check if erasure distribution order matches the index
		// position if this is not correct we discard the disk
		// and move to collect others
		if distribution[i] != meta.Erasure.Index {
			inconsistent++ // keep track of inconsistent entries
			continue
		}

	retStr := "{"
	retStr = retStr + expirationStr + ","
	retStr += conditionStr
	retStr += "}"

	return []byte(retStr)
}

// newPostPolicyBytesV4 - creates a bare bones postpolicy string with key and bucket matches.
func newPostPolicyBytesV4(credential, bucketName, objectKey string, expiration time.Time) []byte {
	t := UTCNow()
	// Add the expiration date.

// and options for listing keys.
type ListRequest struct {
	// Prefix is an optional prefix for filtering names.
	// A list operation only returns elements that match
	// this prefix.
	// An empty prefix matches any value.
	Prefix string

	// ContinueAt is the name of the element from where
	// a listing should continue. It allows paginated
	// listings.
	ContinueAt string

            } else if (log.isTraceEnabled()) {
                log.trace(key + " vs. " + cachedKey);
            }

            if (match) {
                if (log.isDebugEnabled()) {
                    log.debug("Matched " + cachedKey);
                }
                return refs.map.get(cachedKey);
            }
        }
        if (log.isTraceEnabled()) {
            log.trace("No match for " + key);
        }

And be compatible with all of them at the same time.

///

Create a utility function to hash a password coming from the user.

And another utility to verify if a received password matches the hash stored.

And another one to authenticate and return a user.

{* ../../docs_src/security/tutorial004_an_py310.py hl[8,49,56:57,60:61,70:76] *}

/// note

		statusCode: 400,
		cause:      err,
	}
}

func errAmbiguousFieldName(err error) *s3Error {
	return &s3Error{
		code:       "AmbiguousFieldName",
		message:    "Field name matches to multiple fields in the file. Check the SQL expression and the file, and try again.",
		statusCode: 400,
		cause:      err,
	}
}

func errIntegerOverflow(err error) *s3Error {
	return &s3Error{