symtable
ast — 抽象句法树
ast
源代码： Lib/symtable.py
Symbol tables are generated by the compiler from AST just before bytecode is generated. The symbol table is responsible for calculating the scope of every identifier in the code. symtable provides an interface to examine these tables.
Return the toplevel SymbolTable for the Python source code . filename is the name of the file containing the code. compile_type is like the mode 自变量对于 compile() .
SymbolTable
compile()
A namespace table for a block. The constructor is not public.
Return the type of the symbol table. Possible values are 'class' , 'module' , 'function' , 'annotation' , 'TypeVar bound' , 'type alias' ，和 'type parameter' . The latter four refer to different flavors of annotation scopes .
'class'
'module'
'function'
'annotation'
'TypeVar bound'
'type alias'
'type parameter'
Changed in version 3.12: 添加 'annotation' , 'TypeVar bound' , 'type alias' ，和 'type parameter' as possible return values.
Return the table’s identifier.
Return the table’s name. This is the name of the class if the table is for a class, the name of the function if the table is for a function, or 'top' if the table is global ( get_type() 返回 'module' ). For type parameter scopes (which are used for generic classes, functions, and type aliases), it is the name of the underlying class, function, or type alias. For type alias scopes, it is the name of the type alias. For TypeVar bound scopes, it is the name of the TypeVar .
'top'
get_type()
TypeVar
Return the number of the first line in the block this table represents.
返回 True if the locals in this table can be optimized.
True
返回 True if the block is a nested class or function.
返回 True if the block has nested namespaces within it. These can be obtained with get_children() .
get_children()
Return a view object containing the names of symbols in the table. See the 视图对象的文档编制 .
Lookup name in the table and return a Symbol 实例。
Symbol
返回列表化的 Symbol instances for names in the table.
Return a list of the nested symbol tables.
A namespace for a function or method. This class inherits from SymbolTable .
Return a tuple containing names of parameters to this function.
Return a tuple containing names of locals in this function.
Return a tuple containing names of globals in this function.
Return a tuple containing names of nonlocals in this function.
Return a tuple containing names of free variables in this function.
A namespace of a class. This class inherits from SymbolTable .
Return a tuple containing the names of methods declared in the class.
An entry in a SymbolTable corresponding to an identifier in the source. The constructor is not public.
Return the symbol’s name.
返回 True if the symbol is used in its block.
返回 True if the symbol is created from an import statement.
返回 True if the symbol is a parameter.
返回 True if the symbol is global.
返回 True if the symbol is nonlocal.
返回 True if the symbol is declared global with a global statement.
返回 True if the symbol is local to its block.
返回 True if the symbol is annotated.
Added in version 3.6.
返回 True if the symbol is referenced in its block, but not assigned to.
返回 True if the symbol is assigned to in its block.
返回 True if name binding introduces new namespace.
If the name is used as the target of a function or class statement, this will be true.
例如：
>>> table = symtable.symtable("def some_func(): pass", "string", "exec") >>> table.lookup("some_func").is_namespace() True
Note that a single name can be bound to multiple objects. If the result is True , the name may also be bound to other objects, like an int or list, that does not introduce a new namespace.
Return a list of namespaces bound to this name.
Return the namespace bound to this name. If more than one or no namespace is bound to this name, a ValueError 被引发。
ValueError
token — 用于 Python 剖析树的常量
token
键入搜索术语或模块、类、函数名称。