Shouldn't it be animal = 'dog'? If 'dog' is the value you want to see printed after "I like the animal:", this is what you need to do:
animal = 'dog'
animal = 'dog'return render_template('index.html', value=animal)
As you have to pass a value using a variable you have to define it as a string like:animal = 'dog'then pass it to the html template:return render_template('index.html', value=animal)
return render_template('index.html', value=animal)
Now, you should see the passed value in the HTML.