HeldExpression

HeldExpression()

Operations that transform an expression.

Methods

Name	Description
contains	Returns true iff self contains a literally.
is_type	Test if the expression is of a certain type.
matches	Create a transformer that tests whether the pattern is found in the expression.

contains

HeldExpression.contains(s)

Returns true iff self contains a literally.

is_type

HeldExpression.is_type(atom_type)

Test if the expression is of a certain type.

matches

HeldExpression.matches(
    lhs,
    cond=None,
    level_range=None,
    level_is_tree_depth=None,
    allow_new_wildcards_on_rhs=None,
)

Create a transformer that tests whether the pattern is found in the expression. Restrictions on the pattern can be supplied through cond.