request.form获取不到form texarea的值

views中获取form：

content = request.form('comment')

html文件是：

<div class="enter">
  <form id="comment_form" name="comment" action="" method="POST" role="form">
    <div>
    <textarea id="comment" name="comment" class="form-control" rows="3">                            </textarea>
    </div>
    <button type="submit" class="btn btn-default">Submit</button>
  </form>
</div>

错误提示是：

content = request.form('comment')

TypeError: 'ImmutableMultiDict' object is not callable

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TypeError: 'ImmutableMultiDict' object is not callable，用错了，这个提示已经告诉你，form这个字典是不可调用
是request.form.get("comment");