infoCopy.Name = escapeForDot(ShortenFunctionName(infoCopy.Name))
	infoCopy.Name = strings.Replace(infoCopy.Name, "::", `\n`, -1)
	// Go type parameters are reported as "[...]" by Go pprof profiles.
	// Keep this ellipsis rather than replacing with newlines below.
	infoCopy.Name = strings.Replace(infoCopy.Name, "[...]", "[…]", -1)
	infoCopy.Name = strings.Replace(infoCopy.Name, ".", `\n`, -1)
	if infoCopy.File != "" {

```Python hl_lines="7"
{!../../../docs_src/query_params_str_validations/tutorial006b.py!}
```

!!! info
    如果你之前没见过 `...` 这种用法：它是一个特殊的单独值，它是 <a href="https://docs.python.org/3/library/constants.html#Ellipsis" class="external-link" target="_blank">Python 的一部分并且被称为「省略号」</a>。
    Pydantic 和 FastAPI 使用它来显式的声明需要一个值。

这将使 **FastAPI** 知道此查询参数是必需的。

### 使用`None`声明必需参数

	if sig.variadic {
		if ddd {
			// variadic_func(a, b, c...)
			if len(call.Args) == 1 && nargs > 1 {
				// f()... is not permitted if f() is multi-valued
				check.errorf(inNode(call, call.Ellipsis), InvalidDotDotDot, "cannot use ... with %d-valued %s", nargs, call.Args[0])
				return
			}
		} else {
			// variadic_func(a, b, c)
			if nargs >= npars-1 {
				// Create custom parameters for arguments: keep

GTEST_API_ size_t GetThreadCount();

// Passing non-POD classes through ellipsis (...) crashes the ARM
// compiler and generates a warning in Sun Studio.  The Nokia Symbian
// and the IBM XL C/C++ compiler try to instantiate a copy constructor
// for objects passed through ellipsis (...), failing for uncopyable
// objects.  We define this to ensure that only POD is passed through
// ellipsis on these systems.

GTEST_API_ size_t GetThreadCount();

// Passing non-POD classes through ellipsis (...) crashes the ARM
// compiler and generates a warning in Sun Studio.  The Nokia Symbian
// and the IBM XL C/C++ compiler try to instantiate a copy constructor
// for objects passed through ellipsis (...), failing for uncopyable
// objects.  We define this to ensure that only POD is passed through
// ellipsis on these systems.

	{token.ASSIGN, "=", operator},
	{token.NOT, "!", operator},

	{token.NEQ, "!=", operator},
	{token.LEQ, "<=", operator},
	{token.GEQ, ">=", operator},
	{token.DEFINE, ":=", operator},
	{token.ELLIPSIS, "...", operator},

	{token.LPAREN, "(", operator},
	{token.LBRACK, "[", operator},
	{token.LBRACE, "{", operator},
	{token.COMMA, ",", operator},
	{token.PERIOD, ".", operator},

					if isIdent(n.Args[0], "pos") {
						pos := n.Args[0].Pos()
						fun := &ast.SelectorExpr{X: newIdent(pos, "posn"), Sel: newIdent(pos, "Pos")}
						arg := &ast.CallExpr{Fun: fun, Lparen: pos, Args: nil, Ellipsis: token.NoPos, Rparen: pos}
						n.Args[0] = arg
						return false
					}
				case "addf":
					// rewrite err.addf(pos, ...) to err.addf(posn, ...)
					if isIdent(n.Args[0], "pos") {

	if sig.variadic {
		if ddd {
			// variadic_func(a, b, c...)
			if len(call.ArgList) == 1 && nargs > 1 {
				// f()... is not permitted if f() is multi-valued
				//check.errorf(call.Ellipsis, "cannot use ... with %d-valued %s", nargs, call.ArgList[0])
				check.errorf(call, InvalidDotDotDot, "cannot use ... with %d-valued %s", nargs, call.ArgList[0])
				return
			}
		} else {
			// variadic_func(a, b, c)

{content:"\f1a9"}.fa-dyalog:before{content:"\f399"}.fa-earlybirds:before{content:"\f39a"}.fa-edge:before{content:"\f282"}.fa-edit:before{content:"\f044"}.fa-eject:before{content:"\f052"}.fa-elementor:before{content:"\f430"}.fa-ellipsis-h:before{content:"\f141"}.fa-ellipsis-v:before{content:"\f142"}.fa-ember:before{content:"\f423"}.fa-empire:before{content:"\f1d1"}.fa-envelope:before{content:"\f0e0"}.fa-envelope-open:before{content:"\f2b6"}.fa-envelope-square:before{content:"\f199"}.fa-envira:bef...

		} else {
			f.walk(&n.Type, ctxType, visit)
		}
	case *ast.FieldList:
		for _, field := range n.List {
			f.walk(field, context, visit)
		}
	case *ast.BadExpr:
	case *ast.Ident:
	case *ast.Ellipsis:
		f.walk(&n.Elt, ctxType, visit)
	case *ast.BasicLit:
	case *ast.FuncLit:
		f.walk(n.Type, ctxType, visit)
		f.walk(n.Body, ctxStmt, visit)
	case *ast.CompositeLit:
		f.walk(&n.Type, ctxType, visit)