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from phylanx import Phylanx

@Phylanx
def foo():
    a = {"a":1,"b":2,"c":3}
    for k in a:
        print(k)

foo()

a
b
c

dict{c: 3, b: 2, a: 1}

from phylanx import Phylanx

@Phylanx
def foo():
    a = {"a":1,"b":2,"c":3}
    print(len(a))

foo()

Traceback (most recent call last):
  File "x.py", line 8, in <module>
    foo()
  File "/home/jovyan/.local/lib/python3.6/site-packages/phylanx-0.0.1-py3.6-linux-x86_64.egg/phylanx/ast/transducer.py", line 168, in __call__
    result = self.backend.call(*mapped_args, **mapped_kwargs)
  File "/home/jovyan/.local/lib/python3.6/site-packages/phylanx-0.0.1-py3.6-linux-x86_64.egg/phylanx/ast/physl.py", line 578, in call
    self.wrapped_function.__name__, *args, **kwargs)
RuntimeError: x.py(6, 10): __len:: primitive_argument_type does not hold a numeric value type (type held: 'phylanx::ir::dictionary'): HPX(bad_parameter)