Length of Python object — py

Get the length of a Python object. This is equivalent to calling the Python builtin len() function on the object.

py_len(x, default = NULL)

Arguments

x: A Python object.
default: The default length value to return, in the case that the associated Python object has no __len__ method. When NULL (the default), an error is emitted instead.

Value

The length of the object, as a numeric value.

Details

Not all Python objects have a defined length. For objects without a defined length, calling py_len() will throw an error. If you'd like to instead infer a default length in such cases, you can set the default argument to e.g. 1L, to treat Python objects without a __len__ method as having length one.