code: def readGTF(infile):
      
      df=pd.read_table(infile, sep='\t', comment="#", header=None, dtype=str)
      df.columns=['seqname','source','feature','start','end','score','strand','frame','attribute']
      #df = df.astype(str) # from DTC
      return df
docs: Reads a GTF file and labels the respective columns in agreement with GTF file standards:
      'seqname','source','feature','start','end','score','strand','frame','attribute'.
  
      :param infile: path/to/file.gtf
      :returns: a Pandas dataframe of the respective GTF