html = '''
<tr bgcolor="#CCCCCC">
<td colspan="2"><font color="#000000" face="Verdana, Arial, Helvetica, sans-serif" size="1"><span class="txt_arial_8pt_black">1º 
 
                          Período Ideal</span></font></td>
<td><font color="#000000" face="Verdana, Arial, Helvetica, sans-serif" size="1"><span class="txt_arial_8pt_black">Créd.<br/>
 
                          Aula</span></font></td>
<td><font color="#000000" face="Verdana, Arial, Helvetica, sans-serif" size="1"><span class="txt_arial_8pt_black">Créd.<br/>
 
                          Trab.</span></font></td>
<td align="center"><font color="#000000" face="Verdana, Arial, Helvetica, sans-serif" size="1"><span class="txt_arial_8pt_black">CH</span></font></td>
<td align="center" width="6%"><font color="#000000" face="Verdana, Arial, Helvetica, sans-serif" size="1"><span class="txt_arial_8pt_black">CE</span></font></td>
<td align="center" width="6%"><font color="#000000" face="Verdana, Arial, Helvetica, sans-serif" size="1"><span class="txt_arial_8pt_black">CP</span></font></td>
<td align="center" width="6%"><font color="#000000" face="Verdana, Arial, Helvetica, sans-serif" size="1"><span class="txt_arial_8pt_black">ATPA</span></font></td>
</tr>'''
 
import re
print('DOTALL - acha todos')
for texto in re.findall(r'<span class="txt_arial_8pt_black">(.*?)</span>', html, re.DOTALL):
    print(texto)
 
print('MULTILINE - nao acha todos')
for texto in re.findall(r'<span class="txt_arial_8pt_black">(.*?)</span>', html, re.MULTILINE):
    print(texto)
 

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