You should use the bs4.Tag.find_all method or something similar.
soup.find_all(attrs={"face":"arial","font-size":"16px","color":"navy"})
Example:
>>>import bs4
>>>html=""'<div id="accounts" class="elementoOculto"> <table align="center" border="0" cellspacing=0 width="90%"> <tr><th align="left" colspan=2> permisos </th></tr><tr> <td colspan=2> <table width=100% align=center border=0 cellspacing=1> <tr> <th align=center width="20%">cuen</th> <th align=center>Mods</th> </tr> </table> </td> </tr> </table> <table align="center" border="0" cellspacing=1 width="90%"> <tr bgcolor="whitesmoke" height="08"> <td align="left" width="20%"> <font face="arial" font-size="16px" color="navy">001970000521</font> </td> <td>...... <table align="center" border="0" cellspacing=1 width="90%"> <tr bgcolor="whitesmoke" height="08"> <td align="left" width="20%"> <font face="arial" font-size="16px" color="navy">001970000521</font> </td> '''
>>>print bs4.BeautifulSoup(html).find_all(attrs={"face":"arial","font-size":"16px","color":"navy"})
[<font color="navy" face="arial" font-size="16px">001970000521</font>, <font color="navy" face="arial" font-size="16px">001970000521</font>]
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solved Python: Get data BeautifulSoup