try:
    from Bio import SeqIO
    from Bio.Alphabet import IUPAC
except ImportError as e:
    print('ERROR: {}'.format(e.msg))
    exit(1)

def load_file(filename, file_format="fasta"):
    """
    Load sequence from file in FASTA file_format
    filename - Path and filename of input sequence file
    """
    content = None
    try:
        content = SeqIO.read(filename, file_format, IUPAC.unambiguous_dna)
    except ValueError as e:
        print('ERROR: {}'.format(e))
        try:
            content = SeqIO.read(filename, file_format, IUPAC.unambiguous_rna)
        except ValueError as e:
            print('ERROR: {}'.format(e))
            exit(1)

    if content:
        seq = content.seq
        return seq
    else:
        return None

try:
    from Bio import SeqIO
    from Bio.Alphabet import IUPAC
except ImportError as e:
    print('ERROR: {}'.format(e.msg))
    exit(1)

def load_file(filename, file_format="fasta"):
    """
    Load sequence from file and returns sequence as Bio.Seq object
    filename    - String; Path and filename of input sequence file
    file_format - String; Format to be used. Refer to Biopython docs for available formats. Defaults to 'fasta'
    """
    content = None
    try:
        # assume sequence is DNA
        content = SeqIO.read(filename, file_format, IUPAC.unambiguous_dna)
    except ValueError as e:
        # if this fails, try RNA instead
        print('ERROR: {}'.format(e))
        try:
            content = SeqIO.read(filename, file_format, IUPAC.unambiguous_rna)
        except ValueError as e:
            # if this fails, too, raise exception and exit with error code 1
            print('ERROR: {}'.format(e))
            exit(1)

    # if some kind of data could be read, return the sequence object
    if content:
        seq = content.seq
        return seq
    # else return None
    else:
        return None

Prepare for tagging release 0.1: Add comments to LibCharm.IO
Prepare for tagging release 0.1: Add comments to LibCharm.IO

  try:
      from Bio import SeqIO
      from Bio.Alphabet import IUPAC
  except ImportError as e:
      print('ERROR: {}'.format(e.msg))
      exit(1)
  
  def load_file(filename, file_format="fasta"):
      """
-     Load sequence from file in FASTA file_format
+     Load sequence from file and returns sequence as Bio.Seq object
-     filename - Path and filename of input sequence file
+     filename    - String; Path and filename of input sequence file
+     file_format - String; Format to be used. Refer to Biopython docs for available formats. Defaults to 'fasta'
      """
      content = None
      try:
+         # assume sequence is DNA
          content = SeqIO.read(filename, file_format, IUPAC.unambiguous_dna)
      except ValueError as e:
+         # if this fails, try RNA instead
          print('ERROR: {}'.format(e))
          try:
              content = SeqIO.read(filename, file_format, IUPAC.unambiguous_rna)
          except ValueError as e:
+             # if this fails, too, raise exception and exit with error code 1
              print('ERROR: {}'.format(e))
              exit(1)
  
+     # if some kind of data could be read, return the sequence object
      if content:
          seq = content.seq
          return seq
+     # else return None
      else:
          return None
  
Prepare for tagging release 0.1: Add comments to LibCharm.IO
## Code Before:
try:
    from Bio import SeqIO
    from Bio.Alphabet import IUPAC
except ImportError as e:
    print('ERROR: {}'.format(e.msg))
    exit(1)

def load_file(filename, file_format="fasta"):
    """
    Load sequence from file in FASTA file_format
    filename - Path and filename of input sequence file
    """
    content = None
    try:
        content = SeqIO.read(filename, file_format, IUPAC.unambiguous_dna)
    except ValueError as e:
        print('ERROR: {}'.format(e))
        try:
            content = SeqIO.read(filename, file_format, IUPAC.unambiguous_rna)
        except ValueError as e:
            print('ERROR: {}'.format(e))
            exit(1)

    if content:
        seq = content.seq
        return seq
    else:
        return None

## Instruction:
Prepare for tagging release 0.1: Add comments to LibCharm.IO
## Code After:
try:
    from Bio import SeqIO
    from Bio.Alphabet import IUPAC
except ImportError as e:
    print('ERROR: {}'.format(e.msg))
    exit(1)

def load_file(filename, file_format="fasta"):
    """
    Load sequence from file and returns sequence as Bio.Seq object
    filename    - String; Path and filename of input sequence file
    file_format - String; Format to be used. Refer to Biopython docs for available formats. Defaults to 'fasta'
    """
    content = None
    try:
        # assume sequence is DNA
        content = SeqIO.read(filename, file_format, IUPAC.unambiguous_dna)
    except ValueError as e:
        # if this fails, try RNA instead
        print('ERROR: {}'.format(e))
        try:
            content = SeqIO.read(filename, file_format, IUPAC.unambiguous_rna)
        except ValueError as e:
            # if this fails, too, raise exception and exit with error code 1
            print('ERROR: {}'.format(e))
            exit(1)

    # if some kind of data could be read, return the sequence object
    if content:
        seq = content.seq
        return seq
    # else return None
    else:
        return None
