class_docstr: The class used to define vectors.
  
  It along with ReferenceFrame are the building blocks of describing a
  classical mechanics system in PyDy and sympy.physics.vector.
  
  Attributes
  ==========
  
  simp : Boolean
      Let certain methods use trigsimp on their outputs
class_docstr_tok: ["The","class","used","to","define","vectors",".","It","along","with","ReferenceFrame","are","the","building","blocks","of","describing","a","classical","mechanics","system","in","PyDy","and","sympy.physics.vector",".","Attributes","==========","simp",":","Boolean","Let","certain","methods","use","trigsimp","on","their","outputs"]
docstr: Pretty Printing method. 
docstr_tok: ["Pretty","Printing","method","."]
code: def _pretty(self, printer):
      """Pretty Printing method."""
      from sympy.printing.pretty.stringpict import prettyForm
  
      terms = []
  
      def juxtapose(a, b):
          pa = printer._print(a)
          pb = printer._print(b)
          if a.is_Add:
              pa = prettyForm(*pa.parens())
          return printer._print_seq([pa, pb], delimiter=" ")
  
      for M, N in self.args:
          for i in range(3):
              if M[i] == 0:
                  continue
              elif M[i] == 1:
                  terms.append(prettyForm(N.pretty_vecs[i]))
              elif M[i] == -1:
                  terms.append(
                      prettyForm.NEG + prettyForm(N.pretty_vecs[i])
                  )
              else:
                  terms.append(juxtapose(M[i], N.pretty_vecs[i]))
  
      return prettyForm.__add__(*terms)
  
imports: from sympy import S, sympify, expand, sqrt, Add, zeros, acos, ImmutableMatrix, simplify
  from sympy.simplify.trigsimp import trigsimp
  from sympy.printing.defaults import Printable
  from sympy.utilities.misc import filldedent
  from sympy.core.evalf import EvalfMixin
  from mpmath.libmp.libmpf import prec_to_dps
label_desc: Use image node_id 12 for calling the Vector obj's underlying member method code with example usage: obj._pretty(printer) and returns: prettyForm, printer