Question at position 12 In Flask, how do you correctly pass a variable named username with the value "Alex" to a template named profile.html for rendering?In Flask, how do you correctly pass a variable named username with the value "Alex" to a template named profile.html for rendering?return render_template('profile.html', username='Alex')return render_template(username='Alex', 'profile.html')return 'profile.html', {'username': 'Alex'}return render_template('profile.html', {'username': 'Alex'})

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BlackTom AI · Accepted Answer

Question: In Flask, how do you correctly pass a variable named username with the value "Alex" to a template named profile.html for rendering?

Answer options: 
- return render_template('profile.html', username='Alex')
- return render_template(username='Alex', 'profile.html')
- return 'profile.html', {'username': 'Alex'}
- return render_template('profile.html', {'username': 'Alex'})

Option 1: return render_template('profile.html', username='Alex')
This is correct because render_template accepts the template name as the first argument and any number of keyword arguments that define the variables available to the template. Here, username is set to the string "Alex" and will be accessible in profile.html as {{ username }}. The keyword argument syntax is the canonical way to pass data into the template rendering context.

Option 2: return render_template(username='Alex', 'profile.html')
This is invalid syntax for Python function calls: positional arguments should come before keyword arguments, and the template name must be the first positional argument. Flask would raise a TypeError or SyntaxError, because the function call parameters are not ordered correctly and the template name is not provided as the first argument.

Option 3: return 'profile.html', {'username': 'Alex'}
This returns a tuple of (template_name, context) instead of actually rendering the template. Flask expects a rendered string after calling render_template; simply returning a pair does not produce an HTTP response with the rendered HTML. This would typically lead to a server error or unintended behavior.

Option 4: return render_template('profile.html', {'username': 'Alex'})
This passes a single positional argument that is a dictionary as the second parameter, but render_template expects keyword arguments for the context, not a dict as a sole second parameter. While some frameworks might accept a dict in other contexts, Flask’s render_template does not interpret a dict as the expanded context in this way, so the template would not receive username as a separate variable.

In summary, the most appropriate and conventional approach is Option 1, since it correctly specifies the template and passes the required context variable using keyword arguments.

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