<p>
Identifiers name program entities such as variables and types.
An identifier is a sequence of one or more letters and digits.
The first character in an identifier must be a letter.
</p>
<pre class="ebnf">
identifier = letter { letter | unicode_digit } .
</pre>
<pre>
a
_x9
ThisVariableIsExported
αβ
</pre>

<p>
Some identifiers are <a href="#Predeclared_identifiers">predeclared</a>.
</p>

)

const letterBytes = "abcdefghijklmnopqrstuvwxyz01234569"
const (
	letterIdxBits = 6                    // 6 bits to represent a letter index
	letterIdxMask = 1<<letterIdxBits - 1 // All 1-bits, as many as letterIdxBits
	letterIdxMax  = 63 / letterIdxBits   // # of letter indices fitting in 63 bits
)

// Random number state.
// We generate random temporary file names so that there's a good

	defer siteLK.RUnlock()

	return s.region
}

var validRegionRegex = regexp.MustCompile("^[a-zA-Z][a-zA-Z0-9-_-]+$")

// validSiteNameRegex - allows lowercase letters, digits and '-', starts with
// letter. At least 2 characters long.
var validSiteNameRegex = regexp.MustCompile("^[a-z][a-z0-9-]+$")

// LookupSite - get site related configuration. Loads configuration from legacy
// region sub-system as well.

cError","console","warn","message","stack","readyException","readyList","completed","removeEventListener","readyWait","wait","readyState","doScroll","access","chainable","emptyGet","raw","bulk","_key","rmsPrefix","rdashAlpha","fcamelCase","_all","letter","toUpperCase","camelCase","string","acceptData","owner","Data","uid","defineProperty","configurable","set","data","prop","hasData","dataPriv","dataUser","rbrace","rmultiDash","dataAttr","JSON","parse","removeData","_data","_removeData","attrs","...

//           can be null. The names used for function inputs are normalized
//           names of the operations (usually placeholders) pointed to by
//           `inputs`. These operation names should start with a letter.
//           Normalization will convert all letters to lowercase and
//           non-alphanumeric characters to '_' to make resulting names match
//           the "[a-z][a-z0-9_]*" pattern for operation argument names.

				"application/vnd.contact.cmsg",
				"application/vnd.cosmocaller",
				"application/vnd.crick.clicker",
				"application/vnd.crick.clicker.keyboard",
				"application/vnd.crick.clicker.palette",
				"application/vnd.crick.clicker.template",
				"application/vnd.crick.clicker.wordbank",
				"application/vnd.criticaltools.wbs+xml",
				"application/vnd.ctc-posml",
				"application/vnd.ctct.ws+xml",

## CRUD工具

现在让我们看看文件`sql_app/crud.py`。

在这个文件中，我们将编写可重用的函数用来与数据库中的数据进行交互。

**CRUD**分别为：增加（**C**reate）、查询（**R**ead）、更改（**U**pdate）、删除（**D**elete），即增删改查。

...虽然在这个例子中我们只是新增和查询。

### 读取数据

从 `sqlalchemy.orm`中导入`Session`，这将允许您声明`db`参数的类型，并在您的函数中进行更好的类型检查和完成。

导入之前的`models`（SQLAlchemy 模型）和`schemas`（Pydantic*模型*/模式）。

创建一些工具函数来完成：

<p>
The name <code>SP</code> always refers to the virtual stack pointer described earlier.
For the hardware register, use <code>R13</code>.
</p>

<p>
Condition code syntax is to append a period and the one- or two-letter code to the instruction,
as in <code>MOVW.EQ</code>.
Multiple codes may be appended: <code>MOVM.IA.W</code>.
The order of the code modifiers is irrelevant.
</p>

<p>
Addressing modes:
</p>

<ul>

¦€8 º²„„¾„8 ¨²¬¬ ªˆ¦< òˆ †Š€€¾„ˆ† ¬²¸ªbìbˆ½­‘7µ«¿7⺢”¾¼ Æ ¦¾º€¢ˆ²¤¸ª ¦¸ZŠ¿7‘Ÿ©“¢®ª †ª„Œ²¦ª†< 쾸¸¾Ž ˆ°ª ú²¼òþ 渲ª¼ˆ ÖŠ²¦ †ˆ¢„ˆ LÔ>0Š´ŸF]è>…hNsè£ ‰ ¾¦†>º²¼²¾>¸²¼Š Ú„ŽtVxZIˆ»/vf®eeè¨}í¡}uNÜM|£qmTSs•~ýôc}qï½^_ZOB“ãep¼´•]}Ziož†<t X ð¼¹ByT² 8—ú²¼òþttÊ€®„¢¨ª† „ª‚Š²`ª LVxNÕ†¯Ÿp\ mqò gñëGs ÷Ö³ocòQQ¿rm|eEÕm•~ûnAT-kDQ¾ ‘_i^qé ¢¸¸Äö`¢†ºµ`SN¾,WÙqJ°_² ]þ8Rto ž\q¡²¦< "¾ R|RtW†£­bô°ocòšk{1server—÷]`a[©~mhe} I©Fû`yÈŸ@Zå¾–rq«mqns{Š jÜv 3 —Š ¹ m^qï ²¤gË Dü üþÈê „ª‚ŠV„Ž^ÜNL}„•­f\2u}t¸]W1}qÖpO^³_qòsc•\i\wQÕc•jaòçXŸ}µ­$Ö/...

declarations and definitions. These may then be referred to from Go
code as though they were defined in the package "C". All names
declared in the preamble may be used, even if they start with a
lower-case letter. Exception: static variables in the preamble may
not be referenced from Go code; static functions are permitted.

See $GOROOT/cmd/cgo/internal/teststdio and $GOROOT/misc/cgo/gmp for examples. See