How do you pass a variable username to the template?

Question

BlackTom AI · Accepted Answer

We start by restating the problem: How do you pass a variable username to the template? The available options each show a different way of calling render_template with arguments.
Option 1: render_template("profile.html", "username"). Here, the second argument is the literal string "username" rather than a variable holding the username. This would pass the string "username" to the template, not the actual value of the variable, so it’s incorrect for conveying the dynamic username.
Option 2: render_template("profile.html", username). In Python, when you pass a bare name as a positional argument after the template, it’s treated as the first positional parameter for the template context rather than binding it to a named variable in the template. Templates commonly expect keyword arguments like username=... to map to a variable in the template scope. This usage is syntactically valid but does not assign the value to a template variable named username, so it’s not the correct pattern for naming the variable in the template context.
Option 3: render_template("profile.html", name=username). This passes the value of username but assigns it to a template variable named name, not to a variable named username in the template. If the template expects a variable named username, this would not populate it correctly, making this incorrect for the stated goal.
Option 4: render_template("profile.html", username=username). This explicitly binds the Python variable username to a template variable named username by using a keyword argument. This is the standard and correct approach for sending a dynamic username into the template’s context, ensuring the template can reference {{ username }} with the actual value.
In summary, the options differ in how they bind data into the template context: the first uses a literal string, the second relies on a positional argument with an unclear binding, the third maps the value to a differently named variable, and the fourth correctly binds the variable to a username placeholder in the template. The most appropriate pattern for passing a dynamic username is the keyword-argument form shown in the final option,

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How do you pass a variable username to the template?

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