Expressions

eval(expression)

Evaluate a Hail expression, returning the result.

Expression	Base class for Hail expressions.
ArrayExpression	Expression of type tarray.
ArrayNumericExpression	Expression of type tarray with a numeric type.
BooleanExpression	Expression of type tbool.
CallExpression	Expression of type tcall.
CollectionExpression	Expression of type tarray or tset
DictExpression	Expression of type tdict.
IntervalExpression	Expression of type tinterval.
LocusExpression	Expression of type tlocus.
NumericExpression	Expression of numeric type.
Int32Expression	Expression of type tint32.
Int64Expression	Expression of type tint64.
Float32Expression	Expression of type tfloat32.
Float64Expression	Expression of type tfloat64.
SetExpression	Expression of type tset.
StringExpression	Expression of type tstr.
StructExpression	Expression of type tstruct.
TupleExpression	Expression of type ttuple.
NDArrayExpression	Expression of type tndarray.
NDArrayNumericExpression	Expression of type tndarray with a numeric element type.

hail.expr.eval(expression)

Evaluate a Hail expression, returning the result.

This method is extremely useful for learning about Hail expressions and understanding how to compose them.

The expression must have no indices, but can refer to the globals of a Table or MatrixTable.

Examples

Evaluate a conditional:

>>> x = 6
>>> hl.eval(hl.if_else(x % 2 == 0, 'Even', 'Odd'))
'Even'

Parameters:

expression (Expression) – Any expression, or a Python value that can be implicitly interpreted as an expression.

Returns:

Any