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The rcsetup module contains the default values and the validation code for
customization using matplotlib's rc settings.
Each rc setting is assigned a default value and a function used to validate any
attempted changes to that setting. The default values and validation functions
are defined in the rcsetup module, and are used to construct the rcParams global
object which stores the settings and is referenced throughout matplotlib.
These default values should be consistent with the default matplotlibrc file
that actually reflects the values given here. Any additions or deletions to the
parameter set listed here should also be visited to the
:file:`matplotlibrc.template` in matplotlib's root source directory.
from __future__ import print_function
import warnings
from matplotlib.fontconfig_pattern import parse_fontconfig_pattern
from matplotlib.colors import is_color_like
#interactive_bk = ['gtk', 'gtkagg', 'gtkcairo', 'fltkagg', 'qtagg', 'qt4agg',
#                  'tkagg', 'wx', 'wxagg', 'cocoaagg']
# The capitalized forms are needed for ipython at present; this may
# change for later versions.
interactive_bk = ['GTK', 'GTKAgg', 'GTKCairo', 'FltkAgg', 'MacOSX',
                  'QtAgg', 'Qt4Agg', 'TkAgg', 'WX', 'WXAgg', 'CocoaAgg',
                  'GTK3Cairo', 'GTK3Agg']
non_interactive_bk = ['agg', 'cairo', 'emf', 'gdk',
                      'pdf', 'ps', 'svg', 'template']
all_backends = interactive_bk + non_interactive_bk
class ValidateInStrings:
    def __init__(self, key, valid, ignorecase=False):
        'valid is a list of legal strings'
        self.key = key
        self.ignorecase = ignorecase
        def func(s):
            if ignorecase: return s.lower()
            else: return s
        self.valid = dict([(func(k),k) for k in valid])
    def __call__(self, s):
        if self.ignorecase: s = s.lower()
        if s in self.valid: return self.valid[s]
        raise ValueError('Unrecognized %s string "%s": valid strings are %s'
                         % (self.key, s, self.valid.values()))
def validate_path_exists(s):
    'If s is a path, return s, else False'
    if os.path.exists(s): return s
        raise RuntimeError('"%s" should be a path but it does not exist'%s)
def validate_bool(b):
    'Convert b to a boolean or raise'
    if type(b) is str:
        b = b.lower()
    if b in ('t', 'y', 'yes', 'on', 'true', '1', 1, True): return True
    elif b in ('f', 'n', 'no', 'off', 'false', '0', 0, False): return False
        raise ValueError('Could not convert "%s" to boolean' % b)
def validate_bool_maybe_none(b):
    'Convert b to a boolean or raise'
    if type(b) is str:
        b = b.lower()
    if b=='none': return None
    if b in ('t', 'y', 'yes', 'on', 'true', '1', 1, True): return True
    elif b in ('f', 'n', 'no', 'off', 'false', '0', 0, False): return False
        raise ValueError('Could not convert "%s" to boolean' % b)
def validate_float(s):
    'convert s to float or raise'
    try: return float(s)
    except ValueError:
        raise ValueError('Could not convert "%s" to float' % s)
def validate_int(s):
    'convert s to int or raise'
    try: return int(s)
    except ValueError:
        raise ValueError('Could not convert "%s" to int' % s)
def validate_fonttype(s):
    'confirm that this is a Postscript of PDF font type that we know how to convert to'
    fonttypes = { 'type3':    3,
                  'truetype': 42 }
        fonttype = validate_int(s)
    except ValueError:
        if s.lower() in fonttypes.iterkeys():
            return fonttypes[s.lower()]
        raise ValueError('Supported Postscript/PDF font types are %s' % fonttypes.keys())
        if fonttype not in fonttypes.itervalues():
            raise ValueError('Supported Postscript/PDF font types are %s' % fonttypes.values())
        return fonttype
#validate_backend = ValidateInStrings('backend', all_backends, ignorecase=True)
_validate_standard_backends = ValidateInStrings('backend', all_backends, ignorecase=True)
def validate_backend(s):
    if s.startswith('module://'): return s
    else: return _validate_standard_backends(s)
validate_qt4 = ValidateInStrings('backend.qt4', ['PyQt4', 'PySide'])
validate_toolbar = ValidateInStrings('toolbar',[
    'None','classic','toolbar2',
    ], ignorecase=True)
def validate_autolayout(v):
        warnings.warn("figure.autolayout is not currently supported")
def validate_maskedarray(v):
    # 2008/12/12: start warning; later, remove all traces of maskedarray
        if v == 'obsolete':
            return v
    except ValueError:
        pass
    warnings.warn('rcParams key "maskedarray" is obsolete and has no effect;\n'
                  ' please delete it from your matplotlibrc file')
class validate_nseq_float:
    def __init__(self, n):
        self.n = n
    def __call__(self, s):
        'return a seq of n floats or raise'
        if type(s) is str:
            ss = s.split(',')
            if len(ss) != self.n:
                raise ValueError('You must supply exactly %d comma separated values'%self.n)
            try:
                return [float(val) for val in ss]
            except ValueError:
                raise ValueError('Could not convert all entries to floats')
        else:
            assert type(s) in (list,tuple)
            if len(s) != self.n:
                raise ValueError('You must supply exactly %d values'%self.n)
            return [float(val) for val in s]
class validate_nseq_int:
    def __init__(self, n):
        self.n = n
    def __call__(self, s):
        'return a seq of n ints or raise'
        if type(s) is str:
            ss = s.split(',')
            if len(ss) != self.n:
                raise ValueError('You must supply exactly %d comma separated values'%self.n)
            try:
                return [int(val) for val in ss]
            except ValueError:
                raise ValueError('Could not convert all entries to ints')
        else:
            assert type(s) in (list,tuple)
            if len(s) != self.n:
                raise ValueError('You must supply exactly %d values'%self.n)
            return [int(val) for val in s]
def validate_color(s):
    'return a valid color arg'
        if s.lower() == 'none':
            return 'None'
    except AttributeError:
        pass
    if is_color_like(s):
        return s
    stmp = '#' + s
    if is_color_like(stmp):
        return stmp
    # If it is still valid, it must be a tuple.
    colorarg = s
    msg = ''
    if s.find(',')>=0:
        # get rid of grouping symbols
        stmp = ''.join([ c for c in s if c.isdigit() or c=='.' or c==','])
        vals = stmp.split(',')
        if len(vals)!=3:
            msg = '\nColor tuples must be length 3'
        else:
            try:
                colorarg = [float(val) for val in vals]
            except ValueError:
                msg = '\nCould not convert all entries to floats'
    if not msg and is_color_like(colorarg):
        return colorarg
    raise ValueError('%s does not look like a color arg%s'%(s, msg))
def validate_colorlist(s):
    'return a list of colorspecs'
    if type(s) is str:
        return [validate_color(c.strip()) for c in s.split(',')]
        assert type(s) in [list, tuple]
        return [validate_color(c) for c in s]
def validate_stringlist(s):
    'return a list'
    if type(s) is str:
        return [ v.strip() for v in s.split(',') ]
        assert type(s) in [list,tuple]
        return [ str(v) for v in s ]
validate_orientation = ValidateInStrings('orientation',[
    'landscape', 'portrait',
def validate_aspect(s):
    if s in ('auto', 'equal'):
        return s
        return float(s)
    except ValueError:
        raise ValueError('not a valid aspect specification')
def validate_fontsize(s):
    if type(s) is str:
        s = s.lower()
    if s in ['xx-small', 'x-small', 'small', 'medium', 'large', 'x-large',
             'xx-large', 'smaller', 'larger']:
        return s
        return float(s)
    except ValueError:
        raise ValueError('not a valid font size')
def validate_font_properties(s):
    parse_fontconfig_pattern(s)
    return s
validate_fontset = ValidateInStrings('fontset', ['cm', 'stix', 'stixsans', 'custom'])
validate_mathtext_default = ValidateInStrings(
    'default', "rm cal it tt sf bf default bb frak circled scr regular".split())
validate_verbose = ValidateInStrings('verbose',[
    'silent', 'helpful', 'debug', 'debug-annoying',
validate_cairo_format = ValidateInStrings('cairo_format',
                            ['png', 'ps', 'pdf', 'svg'],
                            ignorecase=True)
validate_ps_papersize = ValidateInStrings('ps_papersize',[
    'auto', 'letter', 'legal', 'ledger',
    'a0', 'a1', 'a2','a3', 'a4', 'a5', 'a6', 'a7', 'a8', 'a9', 'a10',
    'b0', 'b1', 'b2', 'b3', 'b4', 'b5', 'b6', 'b7', 'b8', 'b9', 'b10',
    ], ignorecase=True)
def validate_ps_distiller(s):
    if type(s) is str:
        s = s.lower()
    if s in ('none',None):
        return None
    elif s in ('false', False):
        return False
    elif s in ('ghostscript', 'xpdf'):
        return s
        raise ValueError('matplotlibrc ps.usedistiller must either be none, ghostscript or xpdf')
validate_joinstyle = ValidateInStrings('joinstyle',['miter', 'round', 'bevel'], ignorecase=True)
validate_capstyle = ValidateInStrings('capstyle',['butt', 'round', 'projecting'], ignorecase=True)
validate_negative_linestyle = ValidateInStrings('negative_linestyle',['solid', 'dashed'], ignorecase=True)
def validate_negative_linestyle_legacy(s):
        res = validate_negative_linestyle(s)
        return res
    except ValueError:
        dashes = validate_nseq_float(2)(s)
        warnings.warn("Deprecated negative_linestyle specification; use 'solid' or 'dashed'")
        return (0, dashes)  # (offset, (solid, blank))
def validate_tkpythoninspect(s):
    # Introduced 2010/07/05
    warnings.warn("tk.pythoninspect is obsolete, and has no effect")
    return validate_bool(s)
validate_legend_loc = ValidateInStrings('legend_loc',[
  'upper right',
  'upper left',
  'lower left',
  'lower right',
  'center left',
  'center right',
  'lower center',
  'upper center',
  'center',
], ignorecase=True)
def deprecate_svg_embed_char_paths(value):
    warnings.warn("svg.embed_char_paths is deprecated.  Use svg.fonttype instead.")
validate_svg_fonttype = ValidateInStrings('fonttype', ['none', 'path', 'svgfont'])
def validate_hinting(s):
    if s in (True, False):
        return s
    if s.lower() in ('auto', 'native', 'either', 'none'):
        return s.lower()
    raise ValueError("hinting should be 'auto', 'native', 'either' or 'none'")
validate_movie_writer = ValidateInStrings('animation.writer',
    ['ffmpeg', 'ffmpeg_file', 'mencoder', 'mencoder_file'])
validate_movie_frame_fmt = ValidateInStrings('animation.frame_format',
    ['png', 'jpeg', 'tiff', 'raw', 'rgba'])
class ValidateInterval:
    Value must be in interval
    def __init__(self, vmin, vmax, closedmin=True, closedmax=True):
        self.vmin = vmin
        self.vmax = vmax
        self.cmin = closedmin
        self.cmax = closedmax
    def __call__(self, s):
        try: s = float(s)
        except: raise RuntimeError('Value must be a float; found "%s"'%s)
        if self.cmin and s<self.vmin:
            raise RuntimeError('Value must be >= %f; found "%f"'%(self.vmin, s))
        elif not self.cmin and s<=self.vmin:
            raise RuntimeError('Value must be > %f; found "%f"'%(self.vmin, s))
        if self.cmax and s>self.vmax:
            raise RuntimeError('Value must be <= %f; found "%f"'%(self.vmax, s))
        elif not self.cmax and s>=self.vmax:
            raise RuntimeError('Value must be < %f; found "%f"'%(self.vmax, s))
        return s
# a map from key -> value, converter
defaultParams = {
    'backend'           : ['Agg', validate_backend], # agg is certainly present
    'backend_fallback'  : [True, validate_bool], # agg is certainly present
    'backend.qt4'       : ['PyQt4', validate_qt4],
    'toolbar'           : ['toolbar2', validate_toolbar],
    'datapath'          : [None, validate_path_exists],   # handled by _get_data_path_cached
    'interactive'       : [False, validate_bool],
    'timezone'          : ['UTC', str],
    # the verbosity setting
    'verbose.level'     : ['silent', validate_verbose],
    'verbose.fileo'     : ['sys.stdout', str],
    # line props
    'lines.linewidth'       : [1.0, validate_float],     # line width in points
    'lines.linestyle'       : ['-', str],                # solid line
    'lines.color'           : ['b', validate_color],     # blue
    'lines.marker'          : ['None', str],     # black
    'lines.markeredgewidth' : [0.5, validate_float],
    'lines.markersize'      : [6, validate_float],       # markersize, in points
    'lines.antialiased'     : [True, validate_bool],     # antialised (no jaggies)
    'lines.dash_joinstyle'  : ['round', validate_joinstyle],
    'lines.solid_joinstyle' : ['round', validate_joinstyle],
    'lines.dash_capstyle'   : ['butt', validate_capstyle],
    'lines.solid_capstyle'  : ['projecting', validate_capstyle],
    # patch props
    'patch.linewidth'   : [1.0, validate_float], # line width in points
    'patch.edgecolor'   : ['k', validate_color], # black
    'patch.facecolor'   : ['b', validate_color], # blue
    'patch.antialiased' : [True, validate_bool], # antialised (no jaggies)
    # font props
    'font.family'       : ['sans-serif', str],       # used by text object
    'font.style'        : ['normal', str],           #
    'font.variant'      : ['normal', str],           #
    'font.stretch'      : ['normal', str],           #
    'font.weight'       : ['normal', str],           #
    'font.size'         : [12, validate_float],      # Base font size in points
    'font.serif'        : [['Bitstream Vera Serif', 'DejaVu Serif',
                            'New Century Schoolbook', 'Century Schoolbook L',
                            'Utopia', 'ITC Bookman', 'Bookman',
                            'Nimbus Roman No9 L','Times New Roman',
                            'Times','Palatino','Charter','serif'],
                           validate_stringlist],
    'font.sans-serif'   : [['Bitstream Vera Sans', 'DejaVu Sans',
                            'Lucida Grande', 'Verdana', 'Geneva', 'Lucid',
                            'Arial', 'Helvetica', 'Avant Garde', 'sans-serif'],
                           validate_stringlist],
    'font.cursive'      : [['Apple Chancery','Textile','Zapf Chancery',
                           'Sand','cursive'], validate_stringlist],
    'font.fantasy'      : [['Comic Sans MS','Chicago','Charcoal','Impact'
                           'Western','fantasy'], validate_stringlist],
    'font.monospace'    : [['Bitstream Vera Sans Mono', 'DejaVu Sans Mono',
                            'Andale Mono', 'Nimbus Mono L', 'Courier New',
                            'Courier','Fixed', 'Terminal','monospace'],
                           validate_stringlist],
    # text props
    'text.color'          : ['k', validate_color],     # black
    'text.usetex'         : [False, validate_bool],
    'text.latex.unicode'  : [False, validate_bool],
    'text.latex.preamble' : [[''], validate_stringlist],
    'text.latex.preview' : [False, validate_bool],
    'text.dvipnghack'     : [None, validate_bool_maybe_none],
    'text.hinting'        : [True, validate_hinting],
    'text.hinting_factor' : [8, validate_int],
    'text.antialiased'    : [True, validate_bool],
    # The following are deprecated and replaced by, e.g., 'font.style'
    #'text.fontstyle'      : ['normal', str],
    #'text.fontangle'      : ['normal', str],
    #'text.fontvariant'    : ['normal', str],
    #'text.fontweight'     : ['normal', str],
    #'text.fontsize'       : ['medium', validate_fontsize],
    'mathtext.cal'        : ['cursive', validate_font_properties],
    'mathtext.rm'         : ['serif', validate_font_properties],
    'mathtext.tt'         : ['monospace', validate_font_properties],
    'mathtext.it'         : ['serif:italic', validate_font_properties],
    'mathtext.bf'         : ['serif:bold', validate_font_properties],
    'mathtext.sf'         : ['sans\-serif', validate_font_properties],
    'mathtext.fontset'    : ['cm', validate_fontset],
    'mathtext.default'    : ['it', validate_mathtext_default],
    'mathtext.fallback_to_cm' : [True, validate_bool],
    'image.aspect'        : ['equal', validate_aspect],  # equal, auto, a number
    'image.interpolation' : ['bilinear', str],
    'image.cmap'          : ['jet', str],        # one of gray, jet, etc
    'image.lut'           : [256, validate_int],  # lookup table
    'image.origin'        : ['upper', str],  # lookup table
    'image.resample'      : [False, validate_bool],
    'contour.negative_linestyle' : ['dashed', validate_negative_linestyle_legacy],
    # axes props
    'axes.axisbelow'        : [False, validate_bool],
    'axes.hold'             : [True, validate_bool],
    'axes.facecolor'        : ['w', validate_color],    # background color; white
    'axes.edgecolor'        : ['k', validate_color],    # edge color; black
    'axes.linewidth'        : [1.0, validate_float],    # edge linewidth
    'axes.titlesize'        : ['large', validate_fontsize], # fontsize of the axes title
    'axes.grid'             : [False, validate_bool],   # display grid or not
    'axes.labelsize'        : ['medium', validate_fontsize], # fontsize of the x any y labels
    'axes.labelweight'      : ['normal', str], # fontsize of the x any y labels
    'axes.labelcolor'       : ['k', validate_color],    # color of axis label
    'axes.formatter.limits' : [[-7, 7], validate_nseq_int(2)],
                               # use scientific notation if log10
                               # of the axis range is smaller than the
                               # first or larger than the second
    'axes.formatter.use_locale' : [False, validate_bool], # Use the current locale to format ticks
    'axes.unicode_minus'        : [True, validate_bool],
    'axes.color_cycle'      : [['b','g','r','c','m','y','k'],
                                    validate_colorlist], # cycle of plot
    'polaraxes.grid'        : [True, validate_bool],   # display polar grid or not
    'axes3d.grid'           : [True, validate_bool],   # display 3d grid
    #legend properties
    'legend.fancybox'         : [False,validate_bool],
    'legend.loc'         : ['upper right',validate_legend_loc], # at some point, this should be changed to 'best'
    'legend.isaxes'      : [True,validate_bool],  # this option is internally ignored - it never served any useful purpose
    'legend.numpoints'   : [2, validate_int],     # the number of points in the legend line
    'legend.fontsize'    : ['large', validate_fontsize],
    'legend.markerscale' : [1.0, validate_float], # the relative size of legend markers vs. original
    'legend.shadow'        : [False, validate_bool],
    'legend.frameon'     : [True, validate_bool], # whether or not to draw a frame around legend
    # the following dimensions are in fraction of the font size
    'legend.borderpad'   : [0.4, validate_float], # units are fontsize
    'legend.labelspacing'      : [0.5, validate_float], # the vertical space between the legend entries
    'legend.handlelength'     : [2., validate_float], # the length of the legend lines
    'legend.handleheight'     : [0.7, validate_float], # the length of the legend lines
    'legend.handletextpad' : [.8, validate_float], # the space between the legend line and legend text
    'legend.borderaxespad'       : [0.5, validate_float], # the border between the axes and legend edge
    'legend.columnspacing'       : [2., validate_float], # the border between the axes and legend edge
    'legend.markerscale' : [1.0, validate_float], # the relative size of legend markers vs. original
    'legend.shadow'        : [False, validate_bool],
    # tick properties
    'xtick.major.size' : [4, validate_float],      # major xtick size in points
    'xtick.minor.size' : [2, validate_float],      # minor xtick size in points
    'xtick.major.width': [0.5, validate_float],      # major xtick width in points
    'xtick.minor.width': [0.5, validate_float],      # minor xtick width in points
    'xtick.major.pad'  : [4, validate_float],      # distance to label in points
    'xtick.minor.pad'  : [4, validate_float],      # distance to label in points
    'xtick.color'      : ['k', validate_color],    # color of the xtick labels
    'xtick.labelsize'  : ['medium', validate_fontsize], # fontsize of the xtick labels
    'xtick.direction'  : ['in', str],            # direction of xticks
    'ytick.major.size' : [4, validate_float],      # major ytick size in points
    'ytick.minor.size' : [2, validate_float],      # minor ytick size in points
    'ytick.major.width': [0.5, validate_float],      # major ytick width in points
    'ytick.minor.width': [0.5, validate_float],      # minor ytick width in points
    'ytick.major.pad'  : [4, validate_float],      # distance to label in points
    'ytick.minor.pad'  : [4, validate_float],      # distance to label in points
    'ytick.color'      : ['k', validate_color],    # color of the ytick labels
    'ytick.labelsize'  : ['medium', validate_fontsize], # fontsize of the ytick labels
    'ytick.direction'  : ['in', str],            # direction of yticks
    'grid.color'       : ['k', validate_color],       # grid color
    'grid.linestyle'   : [':', str],       # dotted
    'grid.linewidth'   : [0.5, validate_float],     # in points
    # figure props
    # figure size in inches: width by height
    'figure.figsize'    : [ [8.0,6.0], validate_nseq_float(2)],
    'figure.dpi'        : [ 80, validate_float],   # DPI
    'figure.facecolor'  : [ '0.75', validate_color], # facecolor; scalar gray
    'figure.edgecolor'  : [ 'w', validate_color],  # edgecolor; white
    'figure.autolayout' : [ False, validate_autolayout],
    'figure.subplot.left'   : [0.125, ValidateInterval(0, 1, closedmin=True, closedmax=True)],
    'figure.subplot.right'  : [0.9, ValidateInterval(0, 1, closedmin=True, closedmax=True)],
    'figure.subplot.bottom' : [0.1, ValidateInterval(0, 1, closedmin=True, closedmax=True)],
    'figure.subplot.top'    : [0.9, ValidateInterval(0, 1, closedmin=True, closedmax=True)],
    'figure.subplot.wspace' : [0.2, ValidateInterval(0, 1, closedmin=True, closedmax=False)],
    'figure.subplot.hspace' : [0.2, ValidateInterval(0, 1, closedmin=True, closedmax=False)],
    'savefig.dpi'         : [100, validate_float],   # DPI
    'savefig.facecolor'   : ['w', validate_color],  # facecolor; white
    'savefig.edgecolor'   : ['w', validate_color],  # edgecolor; white
    'savefig.orientation' : ['portrait', validate_orientation],  # edgecolor; white
    'savefig.extension'   : ['auto', str],          # what to add to extensionless filenames
    'cairo.format'       : ['png', validate_cairo_format],
    'tk.window_focus'    : [False, validate_bool],  # Maintain shell focus for TkAgg
    'tk.pythoninspect'   : [False, validate_tkpythoninspect],  # obsolete
    'ps.papersize'       : ['letter', validate_ps_papersize], # Set the papersize/type
    'ps.useafm'          : [False, validate_bool],  # Set PYTHONINSPECT
    'ps.usedistiller'    : [False, validate_ps_distiller], # use ghostscript or xpdf to distill ps output
    'ps.distiller.res'   : [6000, validate_int],     # dpi
    'ps.fonttype'        : [3, validate_fonttype], # 3 (Type3) or 42 (Truetype)
    'pdf.compression'    : [6, validate_int],        # compression level from 0 to 9; 0 to disable
    'pdf.inheritcolor'   : [False, validate_bool],   # ignore any color-setting commands from the frontend
    'pdf.use14corefonts' : [False, validate_bool],  # use only the 14 PDF core fonts
                                                    # embedded in every PDF viewing application
    'pdf.fonttype'      : [3, validate_fonttype],  # 3 (Type3) or 42 (Truetype)
    'svg.image_inline'  : [True, validate_bool],    # write raster image data directly into the svg file
    'svg.image_noscale' : [False, validate_bool],  # suppress scaling of raster data embedded in SVG
    'svg.embed_char_paths' : [True, deprecate_svg_embed_char_paths],  # True to save all characters as paths in the SVG
    'svg.fonttype' : ['path', validate_svg_fonttype],
    'docstring.hardcopy' : [False, validate_bool],  # set this when you want to generate hardcopy docstring
    'plugins.directory' : ['.matplotlib_plugins', str], # where plugin directory is locate
    'path.simplify' : [True, validate_bool],
    'path.simplify_threshold' : [1.0 / 9.0, ValidateInterval(0.0, 1.0)],
    'path.snap' : [True, validate_bool],
    'agg.path.chunksize' : [0, validate_int],       # 0 to disable chunking;
                                                    # recommend about 20000 to
                                                    # enable. Experimental.
    # key-mappings
    'keymap.fullscreen' : ['f', validate_stringlist],
    'keymap.home' : [['h', 'r', 'home'], validate_stringlist],
    'keymap.back' : [['left', 'c', 'backspace'], validate_stringlist],
    'keymap.forward' : [['right', 'v'], validate_stringlist],
    'keymap.pan' : ['p', validate_stringlist],
    'keymap.zoom' : ['o', validate_stringlist],
    'keymap.save' : ['s', validate_stringlist],
    'keymap.grid' : ['g', validate_stringlist],
    'keymap.yscale' : ['l', validate_stringlist],
    'keymap.xscale' : [['k', 'L'], validate_stringlist],
    'keymap.all_axes' : ['a', validate_stringlist],
    # sample data
    'examples.download' : [True, validate_bool],
    'examples.directory' : ['', str],
    # Animation settings
    'animation.writer' : ['ffmpeg', validate_movie_writer],
    'animation.codec' : ['mpeg4', str],
    'animation.bitrate' : [-1, validate_int],
    'animation.frame_format' : ['png', validate_movie_frame_fmt], # Controls image format when frames are written to disk
    'animation.ffmpeg_path' : ['ffmpeg', str], # Path to FFMPEG binary. If just binary name, subprocess uses $PATH.
    'animation.ffmpeg_args' : ['', validate_stringlist], # Additional arguments for ffmpeg movie writer (using pipes)
    'animation.mencoder_path' : ['mencoder', str], # Path to FFMPEG binary. If just binary name, subprocess uses $PATH.
    'animation.mencoder_args' : ['', validate_stringlist], # Additional arguments for mencoder movie writer (using pipes)
if __name__ == '__main__':
    rc = defaultParams
    rc['datapath'][0] = '/'
    for key in rc:
        if not rc[key][1](rc[key][0]) == rc[key][0]:
            print("%s: %s != %s"%(key, rc[key][1](rc[key][0]), rc[key][0]))
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