Keywords: mimelib

## 2.9 Miscellaneous utilities

There are several useful utilities provided with the `email` package.

`quote`( | str)

  Return a new string with backslashes in str replaced by two backslashes, and double quotes replaced by backslash-double quote.

`unquote`( | str)

  Return a new string which is an unquoted version of str. If str ends and begins with double quotes, they are stripped off. Likewise if str ends and begins with angle brackets, they are stripped off.

`parseaddr`( | address)

  Parse address - which should be the value of some address-containing field such as To: or Cc: - into its constituent realname and email address parts. Returns a tuple of that information, unless the parse fails, in which case a 2-tuple of `('', '')` is returned.

`formataddr`( | pair)

  The inverse of `parseaddr()`, this takes a 2-tuple of the form `(realname, email_address)` and returns the string value suitable for a To: or Cc: header. If the first element of pair is false, then the second element is returned unmodified.

`getaddresses`( | fieldvalues)

  This method returns a list of 2-tuples of the form returned by `parseaddr()`. fieldvalues is a sequence of header field values as might be returned by `Message.get_all()`. Here's a simple example that gets all the recipients of a message:

      from email.Utils import getaddresses

      tos = msg.get_all('to', [])
      ccs = msg.get_all('cc', [])
      resent_tos = msg.get_all('resent-to', [])
      resent_ccs = msg.get_all('resent-cc', [])
      all_recipients = getaddresses(tos + ccs + resent_tos + resent_ccs)

`parsedate`( | date)

  Attempts to parse a date according to the rules in RFC 2822. however, some mailers don't follow that format as specified, so `parsedate()` tries to guess correctly in such cases. date is a string containing an RFC 2822 date, such as `"Mon, 20 Nov 1995 19:12:08 -0500"`. If it succeeds in parsing the date, `parsedate()` returns a 9-tuple that can be passed directly to `time.mktime()`; otherwise `None` will be returned. Note that fields 6, 7, and 8 of the result tuple are not usable.

`parsedate_tz`( | date)

  Performs the same function as `parsedate()`, but returns either `None` or a 10-tuple; the first 9 elements make up a tuple that can be passed directly to `time.mktime()`, and the tenth is the offset of the date's timezone from UTC (which is the official term for Greenwich Mean Time)2. If the input string has no timezone, the last element of the tuple returned is `None`. Note that fields 6, 7, and 8 of the result tuple are not usable.

`mktime_tz`( | tuple)

  Turn a 10-tuple as returned by `parsedate_tz()` into a UTC timestamp. It the timezone item in the tuple is `None`, assume local time. Minor deficiency: `mktime_tz()` interprets the first 8 elements of tuple as a local time and then compensates for the timezone difference. This may yield a slight error around changes in daylight savings time, though not worth worrying about for common use.

`formatdate`( | [timeval[, localtime]])

  Returns a date string as per RFC 2822, e.g.:

      Fri, 09 Nov 2001 01:08:47 -0000

  Optional timeval if given is a floating point time value as accepted by `time.gmtime()` and `time.localtime()`, otherwise the current time is used.

  Optional localtime is a flag that when `True`, interprets timeval, and returns a date relative to the local timezone instead of UTC, properly taking daylight savings time into account. The default is `False` meaning UTC is used.

`make_msgid`( | [idstring])

  Returns a string suitable for an RFC 2822-compliant Message-ID: header. Optional idstring if given, is a string used to strengthen the uniqueness of the message id.

`decode_rfc2231`( | s)

  Decode the string s according to RFC 2231.

`encode_rfc2231`( | s[, charset[, language]])

  Encode the string s according to RFC 2231. Optional charset and language, if given is the character set name and language name to use. If neither is given, s is returned as-is. If charset is given but language is not, the string is encoded using the empty string for language.

`decode_params`( | params)

  Decode parameters list according to RFC 2231. params is a sequence of 2-tuples containing elements of the form `(content-type, string-value)`.

The following functions have been deprecated:

`dump_address_pair`( | pair)

  Deprecated since release 2.2.2. Use `formataddr()` instead.

`decode`( | s)

  Deprecated since release 2.2.2. Use `Header.decode_header()` instead.

`encode`( | s[, charset[, encoding]])

  Deprecated since release 2.2.2. Use `Header.encode()` instead.

#### Footnotes

... Time)2
  Note that the sign of the timezone offset is the opposite of the sign of the `time.timezone` variable for the same timezone; the latter variable follows the POSIX standard while this module follows RFC 2822.