#----- Example Of Working With Python cgi Module -----#
import cgi


form = cgi.FieldStorage() # FieldStorage object to

CODE # hold the form data


# check whether a field called "username" was used... # it might be used multiple times (so sep w/ commas) if form.has_key(username):

username = form["username"] usernames = "" if type(username) is type(): # Multiple username fields specified for item in username: if usernames: # Next item insert comma usernames = usernames + "," + item.value else: # First item don't insert comma usernames = item.value else: # Single username field specified usernames = username.value

# just for the fun of it let's create an HTML list # of all the fields on the calling form field_list = <ul>\n for field in form.keys():

field_list = field_list + <li>%s</li>\n % field

field_list = field_list + </ul>\n

#----------- Writing HTTP header in Python -------------# print Content-type: text/html\n\n

#----------- Writing HTTP header in Python -------------# print Content-type: image/jpeg\n\n

#------- Step-by-step HTML creation in Python ----------# print <html><head> print <title>My Page</title> print </head><body> print <h1>Powers of two</h1>\n<ol> for n in range(1,11):

print <li>'+str(2**n)+'</li>

print </ol></body></html>

#------- Formatting sprintf()-style in Python ----------# print """<html><head> <title>%s</title> </head><body> <h1>Famous irrational numbers</h1> <dl><dt>Pi</dt>

<dd>%2.3f</dd> <dt>Square-root of 2</dt> <dd>%2.3f</dd></dl>

</body></html>""" % ("Another Page", 3.1415, 1.4142)

#------- Dictionary sprintf()-style in Python ----------# mydict = {"title":"Formatted from Dict", 

"pi": 3.1415, "e": 2.7182,
"sqrt3": 1.73205, "sqrt2": 1.4142}

template = """<html><head> <title>%(title)s</title> </head><body> <h1>Famous irrational numbers</h1> <dl><dt>Pi</dt>

<dd>%(pi)2.3f</dd> <dt>Square-root of 2</dt> <dd>%(sqrt2)2.3f</dd></dl>

</body></html>""" print template % mydict

#---------- Debugging CGI script in Python -------------# import sys sys.stderr = sys.stdout

def main():

import cgi # ...do the actual work of the CGI... # perhaps ending with: print template % script_dictionary

print "Content-type: text/html\n\n" main()

#------- Debugging/logging CGI script in Python --------# import sys, traceback print "Content-type: text/html\n\n" try: # use explicit exception handling

import my_cgi # main CGI functionality in my_cgi.py my_cgi.main()

except:

import time errtime = - '+ time.ctime(time.time()) + ---\n' errlog = open(cgi_errlog, a) errlog.write(errtime) traceback.print_exc(None, errlog) print "<html><head><title>CGI Error Encountered!</title></head>" print "<body><p>Sorry, a problem was encountered running MyCGI</p>" print "<p>Please check the error log on the server for details</p>" print "</body></html>"