text: 
  
  def set_pars(mpl):
      mpl.rcParams['text.latex.preamble']=[r"\usepackage{amsmath}"]
      mpl.rcParams['text.latex.preamble']=[r"\usepackage{amssymb}"]
      params={'text.usetex': True,
              'lines.linewidth': 2,
              'lines.markersize': 8,
              'lines.markeredgewidth': 2.0,
              'font.size': 20,
              'legend.fontsize': 15,
              }
      mpl.rcParams.update(params)
      fig_par={'dpi': 1000,
               'facecolor': 'w',
               'edgecolor': 'k',
               'figsize': (8, 6),
               'figsize_square': (6, 6),
               'pad_inches': 0.05,
               }
  
      return fig_par
  
  def set_labels():
      lines=['bx-', 'ro--', 'rs-', 'go:', 'gs:', 'b+--']
      labels={}
      return lines, labels
  
  def copy_files(src, dest, files='all'):
      import os
      from shutil import copy
      src_files=os.listdir(src)
      for file_name in src_files:
          if files=='all' or file_name in files:
              full_file_name=os.path.join(src, file_name)
              if (os.path.isfile(full_file_name)):
                  copy(full_file_name, dest)
          else:
              continue
      print('copy of files is finished')
      return
  
  if __name__=='__main__':
      pass
  