class_docstr: Extension of the stringPict class that knows about basic math applications,
  optimizing double minus signs.
  
  "Binding" is interpreted as follows::
  
      ATOM this is an atom: never needs to be parenthesized
      FUNC this is a function application: parenthesize if added (?)
      DIV  this is a division: make wider division if divided
      POW  this is a power: only parenthesize if exponent
      MUL  this is a multiplication: parenthesize if powered
      ADD  this is an addition: parenthesize if multiplied or powered
      NEG  this is a negative number: optimize if added, parenthesize if
           multiplied or powered
      OPEN this is an open object: parenthesize if added, multiplied, or
           powered (example: Piecewise)
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code: def unicode(self):
      sympy_deprecation_warning(
          """
              The prettyForm.unicode attribute is deprecated. Use the
              prettyForm.s attribute instead.
              """,
          deprecated_since_version="1.7",
          active_deprecations_target="deprecated-pretty-printing-functions",
      )
      return self._unicode
  
imports: import shutil
  from .pretty_symbology import hobj, vobj, xsym, xobj, pretty_use_unicode, line_width, center
  from sympy.utilities.exceptions import sympy_deprecation_warning
label_desc: Use image node_id 2 for calling the prettyForm obj's underlying member method code with example usage: obj.unicode() and returns: self