Add variable value to read file in Python

Question

I have a question regarding adding variable value to text that is read from file. My situation is that I would like to have separate html file with variables that would pull value from code.

Example of .txt file:

"""Current value of variable x is: """ + str(x) + """ and so on."""

Code that I have tried, is:

x = 5
f = open("C:\\Test\\reading.txt",'r')
print(f.read())

What I would like to finish with is:

"""Current value of variable x is: 5 and so on."""

Reason why I would like to have it is to have separate html file, generate html code from it in combination with variable values and than use that string further for sending email. Worst case, I can embed html code into code where I calculate variable values, but would be more handy to keep them separated.

Sounds vaguely like you are looking for HTML templates. A common simple template engine is jinja which is used e.g. in flask. — tripleee
– tripleee, Commented Jan 31, 2018 at 11:15
What you are looking for is template engine. see: fullstackpython.com/template-engines.html — napuzba
– napuzba, Commented Jan 31, 2018 at 11:17

arnaud · Accepted Answer · 2018-01-31 14:41:55Z

1

As pointed by @tripleee, package jinja2 is what you're looking for.

Inside your template.html file, you can just add spots for variables e.g.

<p>Current value of variable x is: {{ my_variable }} and so on.</p>

And render them using .render() from jinja.

import jinja2
template_loader = jinja2.FileSystemLoader(searchpath="./")
template_env = jinja2.Environment(loader=template_loader)
template_file = "./template.html"
template = template_env.get_template(template_file)
my_variable = 2
output_text = template.render(my_variable=my_variable) # this is where to put args to the template renderer
with open('./output.html', 'w') as f:
    f.write(output_text)

And now your file output.html is

<p>Current value of variable x is: 2 and so on.</p>

edited Jan 31, 2018 at 14:41

answered Jan 31, 2018 at 11:25

arnaud

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3 Comments

Bostjan Over a year ago

Cheers, that did the trick. Thank you very much for fast response.

Bostjan Over a year ago

Would just like to point out one thing regarding template - at least in my case, it did not work with 3 {} for variable placeholder, 2 {} did the trick.

arnaud Over a year ago

Absolutely, I can find only {{ in my templates. Or {% for chained placeholders. You're right, I'll edit that. Thanks :)

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