Extended call syntax. At present, nested calls (i.e. where the
argument to a function call is itself a complex expression)
lead to excess brackets and layout problems which are contrary
to the usual clean syntax of python. An extended syntax allowing
something like:
x = f 1, 2, 3:
with parameter1 = argument1
with parameter2 = argument2
would be useful. This is particularly important building
deeply nested structures such as GUI widgets.