because you must format the output of your Python program so that the web client thinks it’s coming
from a webpage document.
To format the output of your Python program for a browser to process, you need to add a
Multipurpose Internet Mail Extensions (MIME) heading at the start of your output. You do this with
the Content-Type header, as shown here:
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print('Content-Type: text/html')
print('')After you identify the output as an HTML document, you also need to have a blank line before any
other output from the program.
Try It Yourself: Creating a Python Web Program
Now you’re ready to write a test Python program to run on the web server. Follow
along with these steps to get things going:- Create a file called script2202.cgi in the folder for this hour.
- Open the script2202.cgi file and enter the code shown here:
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#!/usr/bin/python3
import math
radius = 5
area = math.pi radius radius
print('Content-Type: text/html')
print('')
print('The area of a circle with radius', radius, 'is', area) - Save the file and exit the editor.
- Test your script from the Python command prompt interpreter, like this:
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pi@raspberrypi ~ $ python3 script2202.cgi
Content-Type: text/html
The area of a circle with radius 5 is 78.53981633974483
pi@raspberrypi ~ $- If this works, copy the script file to the /usr/lib/cgi-bin folder for
publishing and make sure web clients can run it by giving everyone execute
permissions on the file, like this:
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pi@raspberrypi ~ $ sudo cp script2202.cgi /usr/lib/cgi-bin
pi@raspberrypi ~ $ sudo chmod +x /usr/lib/cgi-bin/script2202.cgi
pi@raspberrypi ~ $ - Open your browser and browse to the new program. Because the file is in the cgi-
bin folder, you need to include that in the URL:
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