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print_environ_usage()
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Prints a more selected list of useful environment variables in HTML and is used for debugging
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print_form(form)
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Formats the data supplied on a form in HTML form must be an instance of FieldStorage Used for debugging
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test()
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Writes a minimal HTTP header and prints all the information provided to the script in HTML format Primarily used for debugging to make sure your CGI environment is set up correctly
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In the current age of web frameworks, CGI scripting seems to have fallen out of fashion However, if you are going to use it, there are a couple of programming tips that can simplify your life First, don t write CGI scripts where you are using a huge number of print statements to produce hard-coded HTML outputThe resulting program will be a horrible tangled mess of Python and HTML that is not only impossible to read, but also impossible to maintain A better approach is to rely on templates Minimally, the stringTemplate object can be used for this Here is an example that outlines the concept:
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import cgi from string import Template def error(message): temp = Template(open("errormsghtml")read()) print 'Content-type: text/html\r' print '\r' print tempsubstitute({'message' : message}) form = cgiFieldStorage() name = formgetfirst('name') email = formgetfirst('email') if not name: error("name not specified") raise SystemExit elif not email: error("email not specified") raise SystemExit # Do various processing confirmation = subscribe(name, email)
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# Print the output page values = { 'name' : name, 'email' : email, 'confirmation: ': confirmation, # Add other values here } temp = Template(open("successhtml")read() print tempsubstitute(values)
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In this example, the files 'errorhtml' and 'successhtml' are HTML pages that have all of the output but include $variable substitutions corresponding to dynamically generated values used in the CGI script For example, the 'successhtml' file might look like this:
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<HTML> <HEAD> <TITLE>Success</TITLE> </HEAD> <BODY> Welcome $name You have successfully subscribed to our newsletter Your confirmation code is $confirmation </BODY> </HTML>
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The tempsubstitute() operation in the script is simply filling in the variables in this file An obvious benefit of this approach is that if you want to change the appearance of the output, you just modify the template files, not the CGI scriptThere are many thirdparty template engines available for Python maybe in even greater numbers than web frameworksThese take the templating concept and build upon it in substantial ways See http://wikipythonorg/moin/Templating more details Second, if you need to save data from a CGI script, try to use a database Although it is easy enough to write data directly to files, webservers operate concurrently, and unless you ve taken steps to properly lock and synchronize resources, it is possible that files will get corrupted Database servers and their associated Python interface usually don t have this problem So if you need to save data, try to use a module such as sqlite3 or a third-party module for something like MySQL Finally, if you find yourself writing dozens of CGI scripts and code that has to deal with low-level details of HTTP such as cookies, authentication, encoding, and so forth, you may want to consider a web framework insteadThe whole point of using a framework is so that you don t have to worry about those details well, at least not as much So, don t reinvent the wheel
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Notes
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The process of installing a CGI program varies widely according to the type of webserver being usedTypically programs are placed in a special cgi-bin directory A server may also require additional configurationYou should consult the documentation for the server or the server s administrator for more details
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On UNIX, Python CGI programs may require appropriate execute permissions to be set and a line such as the following to appear as the first line of the program: