Easy AST validation
A series of AST validators for validating the integrity of the tree.
The stable interface is
validate, which comes directly from the root of
the package. It takes the tree, and the validation level. Validation level
specifies the strictness degree; for an example if it is 1, tree will be only
checked by some basic checks that is similiar to
PyAST_Validate interface in
Python/ast.c. Increasing levels means increasing checks and strictness.
import ast from astvalidate import validate tree = ast.parse("def x(): raise X from Y") assert validate(tree)
If the validator encounters with anything that shouldn't be, it raises a
with the node's line number and column offset. Also the original node that caused the
error is attached to the exception's
tree.body.body.exc = None assert validate(tree)
SyntaxError: Raise's cause can't be used without setting an exception
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