Posting HTML form data to Python by FieldStorage()

<form name=f1 method=post action=form-submit.py>
<table>
<tr><td>First Name </td><td><input type=text name=f_name><td></tr>
<tr><td>Second Name</td><td> <input type=text name=s_name></td></tr>
<tr><td>Sex</td><td> <input type=radio name=r1 value=male> Male 
<input type=radio name=r1 value=female> Female </td></tr>
<tr><td>Class</td><td> <select name=class>
<option value='Three'>Three</option>
<option value='Four'>Four</option>
<option value='Five'>Five</option>
</select>
 </td></tr>
 <tr><td><input type=submit value=Submit></td><td> </td></tr>
</table>
</form>

print("HTTP/1.0 200 OK\n")
import cgi
form = cgi.FieldStorage()
f_name=form["f_name"].value
s_name=form["s_name"].value
r1=form["r1"].value
my_class=form["class"].value


print("<br><b>First Name</b>",f_name)
print("<br><b>Second Name</b>",s_name)
print("<br><b>Sex</b>",r1)
print("<br><b>Class</b>",my_class)
print("<br><br><br><a href=form.htm>Back to Form</a>")

print("HTTP/1.0 200 OK\n")
import cgi
form = cgi.FieldStorage()
try:
    f_name=form["f_name"].value
except :
    f_name=' First name is blank ' 
	
try:
    s_name=form["s_name"].value
except :
    s_name=' Second name is blank ' 
	
try:
    r1=form["r1"].value
except :
    r1=' No selection of  Sex'

try:
    my_class=form["class"].value
except:	
	my_class= ' Select Class '

print("<br><b>First Name</b>",f_name)
print("<br><b>Second Name</b>",s_name)
print("<br><b>Sex</b>",r1)
print("<br><b>Class</b>",my_class)
print("<br><br><br><a href=form.htm>Back to Form</a>")

First Name First name
Second Name Second name
Sex male
Class Five