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src/f/l/flasky-HEAD/app/main/views.py   flasky(Download)
        flash('Invalid user.')
        return redirect(url_for('.index'))
    if current_user.is_following(user):
        flash('You are already following this user.')
        return redirect(url_for('.user', username=username))
        flash('Invalid user.')
        return redirect(url_for('.index'))
    if not current_user.is_following(user):
        flash('You are not following this user.')
        return redirect(url_for('.user', username=username))