Here we will learn how we can control HTML document with the server-side script "Python". You might think it would be difficult but actually it is not so difficult.
Please write:
print("Hello World")By the way, print("") is used to display some words. See the result below.
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Then click "Run". You will see "Hello World" will appear on the console. ("Console" means the black window next to the editor window)
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Yes, "Hello World" is displayed... but you would wonder like this "yes, hello world appeared on the console... but so what?" This seems like a small step but actually this is a very big leap for your web programming.
Write this way now:
print("<h1>Welcome to my website</h1>")
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Look at the console. You can see it is displaying "<h1>Welcome to my website</h1>". If this is executed on a server, this "<h1>Welcome to my website</h1>" is shown to each browser that accessed to your website.
But the browser will see it as a HTML page as long as it has HTML structure. <h1></h1> is HTML tag to make big letters. So the result on each browser will be as follows:
This means you can dynamically adjust and control HTML document before it is rendered in each browser. See an example below:
code:
print("<h1>Welcome to my website</h1>")
amount = 100.0
if amount < 100:
discount = amount * 0.05
elif amount < 500:
discount = amount * 0.10
else:
discount = amount * 0.15
print ("<p>Your amount: ",amount,"</p>")
print ("<p>Discount: ",discount, "</p>")
print ("<p>Net payable: ",amount-discount,"</p>")
And the result of this code will be
So HTML content shown in a browser is also changed:
You can see each value is changed
This is how server-side programming (or server-side scripting) is done.
