##
4.6.2 Field class

class `Field`()
  This class is used internally by `FieldStorage` and is not meant to be instantiated by the user. Each instance of a `Field` class represents an HTML Form input.

  `Field` instances have the following attributes:

  `name`
    The input name.

  `value`
    The input value. This attribute can be used to read data from a file upload as well, but one has to exercise caution when dealing with large files since when accessed via `value`, the whole file is read into memory.

  `file`
    This is a file object. For file uploads it points to a temporary file. For simple values, it is a `StringIO` object, so you can read simple string values via this attribute instead of using the `value` attribute as well.

  `filename`
    The name of the file as provided by the client.

  `type`
    The content-type for this input as provided by the client.

  `type_options`
    This is what follows the actual content type in the `content-type` header provided by the client, if anything. This is a dictionary.

  `disposition`
    The value of the first part of the `content-disposition` header.

  `disposition_options`
    The second part (if any) of the `content-disposition` header in the form of a dictionary.

  See Also:

  RFC 1867, Form-based File Upload in HTML
    for a description of form-based file uploads