from __future__ import (absolute_import, division, print_function,

unicode_literals)

import six

import matplotlib

import inspect

import warnings

# ipython relies on interactive_bk being defined here

from matplotlib.rcsetup import interactive_bk

__all__ = ['backend','show','draw_if_interactive',

'new_figure_manager', 'backend_version']

backend = matplotlib.get_backend() # validates, to match all_backends

def pylab_setup():

'return new_figure_manager, draw_if_interactive and show for pylab'

# Import the requested backend into a generic module object

if backend.startswith('module://'):

backend_name = backend[9:]

else:

backend_name = 'backend_'+backend

backend_name = backend_name.lower() # until we banish mixed case

backend_name = 'matplotlib.backends.%s'%backend_name.lower()

# the last argument is specifies whether to use absolute or relative

# imports. 0 means only perform absolute imports.

backend_mod = __import__(backend_name,

globals(),locals(),[backend_name],0)

# Things we pull in from all backends

new_figure_manager = backend_mod.new_figure_manager

# image backends like pdf, agg or svg do not need to do anything

# for "show" or "draw_if_interactive", so if they are not defined

# by the backend, just do nothing

def do_nothing_show(*args, **kwargs):

frame = inspect.currentframe()

fname = frame.f_back.f_code.co_filename

if fname in ('<stdin>', '<ipython console>'):

warnings.warn("""

Your currently selected backend, '%s' does not support show().

Please select a GUI backend in your matplotlibrc file ('%s')

or with matplotlib.use()""" %

(backend, matplotlib.matplotlib_fname()))

def do_nothing(*args, **kwargs): pass

backend_version = getattr(backend_mod,'backend_version', 'unknown')

show = getattr(backend_mod, 'show', do_nothing_show)

draw_if_interactive = getattr(backend_mod, 'draw_if_interactive', do_nothing)

# Additional imports which only happen for certain backends. This section

# should probably disappear once all backends are uniform.

if backend.lower() in ['wx','wxagg']:

Toolbar = backend_mod.Toolbar

__all__.append('Toolbar')

matplotlib.verbose.report('backend %s version %s' % (backend,backend_version))

return backend_mod, new_figure_manager, draw_if_interactive, show