def standard_pcr(primer_df, outfile):
    """
    Creates standard PCR input file (one primer with one other) to run in silico PCR.
    Args:
        primer_df (pd.DataFrame): dataframe with primer info
    Returns:
        nothing: writes a file output
    """
    standard = open(outfile, 'w')
    for seqid, primer_left, primer_right in zip(primer_df['Sequence ID'],
        primer_df['Primer Left Seq'], primer_df['Primer Right Seq']):
        standard.write(str(seqid) + '\t' + str(primer_left) + '\t' + str(
            primer_right) + '\n')
    standard.close()
