class_docstr: GraphicsItem showing a single plot axis with ticks, values, and label.
  Can be configured to fit on any side of a plot, 
  Can automatically synchronize its displayed scale with ViewBox items.
  Ticks can be extended to draw a grid.
  If maxTickLength is negative, ticks point into the plot.
docstr: Return the strings that should be placed next to ticks. This method is called
  when redrawing the axis and is a good method to override in subclasses.
  The method is called with a list of tick values, a scaling factor (see below), and the
  spacing between ticks (this is required since, in some instances, there may be only
  one tick and thus no other way to determine the tick spacing)
  
  The scale argument is used when the axis label is displaying units which may have an SI scaling prefix.
  When determining the text to display, use value*scale to correctly account for this prefix.
  For example, if the axis label's units are set to 'V', then a tick value of 0.001 might
  be accompanied by a scale value of 1000. This indicates that the label is displaying 'mV', and
  thus the tick should display 0.001 * 1000 = 1.
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code: def tickStrings(self, values, scale, spacing):
      """Return the strings that should be placed next to ticks. This method is called
      when redrawing the axis and is a good method to override in subclasses.
      The method is called with a list of tick values, a scaling factor (see below), and the
      spacing between ticks (this is required since, in some instances, there may be only
      one tick and thus no other way to determine the tick spacing)
  
      The scale argument is used when the axis label is displaying units which may have an SI scaling prefix.
      When determining the text to display, use value*scale to correctly account for this prefix.
      For example, if the axis label's units are set to 'V', then a tick value of 0.001 might
      be accompanied by a scale value of 1000. This indicates that the label is displaying 'mV', and
      thus the tick should display 0.001 * 1000 = 1.
      """
      if self.logMode:
          return self.logTickStrings(values, scale, spacing)
  
      places = max(0, ceil(-log10(spacing * scale)))
      strings = []
      for v in values:
          vs = v * scale
          if abs(vs) < 0.001 or abs(vs) >= 10000:
              vstr = "%g" % vs
          else:
              vstr = ("%%0.%df" % places) % vs
          strings.append(vstr)
      return strings
  
imports: import weakref
  from math import ceil, floor, isfinite, log10, sqrt, frexp, floor
  import numpy
  from ..None import debug
  from ..None import functions
  from ..None import getConfigOption
  from ..Point import Point
  from ..Qt import QtCore, QtGui, QtWidgets
  from .GraphicsWidget import GraphicsWidget
label_desc: Use image node_id 41 for calling the AxisItem obj's underlying member method code with example usage: obj.tickStrings(values, scale, spacing) and returns: strings, self