Assign Python variable to JavaScript variable

Question

i am doing maintenance on a website that is using Python and CGI. The site currently runs on Python, but for some weird reason I have to assign a Python variable to a JavaScript variable on the same Python file. I have tried many things and they have not worked, I don't know if it's even possible to do so. Any help would be greatly appreciated. I have simplified the code just to show the variable exchange from Python to JavaScript I need to do. My Python version is 3.5.2 and the site is running on IIS server. Again thank you very much for your help and time.

import cgi

print('')
temp = 78 #These is the Python variable I need to assign to the Javascript variable.

print('<html>')
print('<script type="text/javascript">')
print('var x = {{temp}};') #Here's how I'm trying to assign the python variable.
print('document.write(x);')
print('document.write("HELLO PYTHON VARIABLE!!");')
print('</script>')
print('</html>')

Is it just a number, or does the variable hold user input? (because then there's security involved) — RemcoGerlich
– RemcoGerlich, Commented Jan 13, 2017 at 18:25

blerg · Accepted Answer · 2017-01-13 18:28:07Z

2

print('var x = {{temp}};') #Here's how I'm trying to assign the python variable.

It looks like you are trying to do a template thing without actually being in a templating engine.

Try this instead:

print( 'var x =' + temp + ';' )

answered Jan 13, 2017 at 18:28

blerg

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1 Comment

Alejandro Erdmenger Over a year ago

Thanks a lot Evan Thompson! You'r absolutely right I need to do that, in meantime, these solved mi immediate problem, it worked perfectly, thank you very much!

GantTheWanderer · Accepted Answer · 2017-01-13 18:27:54Z

1

Many ways to do this:

print ('var x = %d' % temp)

print ('var x = ' + str(temp) + ';')

print ('var x = {{temp}};'.replace("{{temp}}", str(temp)))

answered Jan 13, 2017 at 18:27

GantTheWanderer

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4 Comments

Alejandro Erdmenger Over a year ago

Thank you very much GantTheWanderer!! It is just numbers i wanted to exchange, both ways worked perfectly!!! I had many days stuck whit these, you just saved a lot of time, again thanks for your kind response. Best regards from Guatemala.

GantTheWanderer Over a year ago

De nada, writing programs that write programs can be tricky at first, but with practice it become second nature. Other pitfalls include having to deal with quotes (ie temp = "Occam's Razor" print ("var x = '" + temp + "'") you could get in trouble fast keeping track of them.

Alejandro Erdmenger Over a year ago

Muchas gracias otra vez Grant! Wow, you are right it is really hard to keep track of the quotes, i could not get your string example to work, but i was not taking to count that i'am using version 3.5 and i think, yours is 2.7 because of the double quotes on "Occam's Razor" it worked for mi like this 'Occam's Razor' with a single quote, thanks for the example with strings, because i just stumble upon with exactly that issue right now, thanks a lot!!

GantTheWanderer Over a year ago

Right on hombre! Don't worry it wont be the last time you see such things. :)

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