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import inspect

def _get_caller_module_name():
    """Return the name of the caller's module by inspecting call stack."""
    caller_frame = inspect.stack()[1][0]
    caller_module = inspect.getmodule(caller_frame)
    caller_module_name = None
    if caller_module is not None:
        caller_module_name = caller_module.__name__
    return caller_module_name
    
    
import os, fcntl
def read_non_blocking(file_handler):
    """A iterator that does a non-blocking read over given file handler.

    :param file_handler: file_handler to read from
    :returns: line read from the given file
    """
    # set non-blocking mode
    current_flags = fcntl.fcntl(file_handler, fcntl.F_GETFL)
    fcntl.fcntl(file_handler, fcntl.F_SETFL, current_flags | os.O_NONBLOCK)


    output_buffer = ''
    while True:
        try:
            output = output_buffer + os.read(file_handler.fileno(), 1024)
            if output == '':  # EOF
                raise StopIteration

            # Since there is no non-blocking os.readline(), parsing output and creating an equivalent
            output_buffer = ''
            for line in output.splitlines(True):
                if line.endswith('\n'):
                    yield line
                else:  # Incomplete
                    output_buffer += line

        except OSError:
            sleep(1)



def get_installed_pkgs():
  """ Get list of installed pkgs at sys level or in a venv. """
  # http://stackoverflow.com/a/23885252
  import pip, pprint
  installed_packages = pip.get_installed_distributions()
  installed_packages_list = sorted(["%s==%s" % (i.key, i.version)
     for i in installed_packages])

  pprint.pprint(installed_packages_list)
    
  with open('/tmp/pkgs.list', 'w') as f:
    f.write('\n'.join(installed_packages_list))