all Python 3astterm

ast.boolop

operators

The abstract base class of the boolean operators And and Or. An instance sits in the op field of a BoolOp node.

Syntax

isinstance(node.op, ast.boolop)

The chain a and b and c is a single BoolOp with three values, not nested pairs; the mixed a or b and c is BoolOp(Or) with a nested BoolOp(And), following precedence. not does not belong here: it is the unary Not from unaryop. Check the operator type with isinstance(node.op, ast.And), not with ==.

Examples

import ast
e = ast.parse('a and b and c', mode='eval').body
print(type(e.op).__name__, isinstance(e.op, ast.boolop), len(e.values))  # → And True 3
print([c.__name__ for c in ast.boolop.__subclasses__()])  # → ['And', 'Or']

import ast
e = ast.parse('a or b and c', mode='eval').body
print(type(e.op).__name__, type(e.values[1].op).__name__)  # → Or And

ast.boolop

Syntax

Examples

See also