how to use pycallgraph in ubuntu and window?

[meInvent bbird]

i install in ubunbu 14

pip install graphviz
pip install pycallgraph

martin at ubuntu:~/Downloads$ pycallgraph graphviz -- ./pusher.py
Traceback (most recent call last):
  File "/usr/local/bin/pycallgraph", line 25, in <module>
    with __pycallgraph.PyCallGraph(config=__config):
  File "/usr/local/lib/python2.7/dist-packages/pycallgraph/pycallgraph.py", line 32, in __init__
    self.reset()
  File "/usr/local/lib/python2.7/dist-packages/pycallgraph/pycallgraph.py", line 53, in reset
    self.prepare_output(output)
  File "/usr/local/lib/python2.7/dist-packages/pycallgraph/pycallgraph.py", line 97, in prepare_output
    output.sanity_check()
  File "/usr/local/lib/python2.7/dist-packages/pycallgraph/output/graphviz.py", line 63, in sanity_check
    self.ensure_binary(self.tool)
  File "/usr/local/lib/python2.7/dist-packages/pycallgraph/output/output.py", line 96, in ensure_binary
    'The command "{}" is required to be in your path.'.format(cmd))
pycallgraph.exceptions.PyCallGraphException: The command "dot" is required to be in your path.


in window 

i had already added path

C:\Python27\Lib\site-packages\graphviz;C:\Python27\Lib\site-packages\pycallgraph

 to environment variable path

but in cmd

'pycallgraph' is not recognized as an internal or external command,
operable program or batch file.

then i use full path

>python "C:\Python27\Lib\site-packages\pycallgraph\py
callgraph.py"  -- "C:\Users\hello\Downloads\pusher.py"
Traceback (most recent call last):
  File "C:\Python27\Lib\site-packages\pycallgraph\pycallgraph.py", line 3, in <m
odule>
    from .output import Output
ValueError: Attempted relative import in non-package