prevent readline() calls from consuming too much memory.  Patch by Jyrki
  Pulliainen.

  prevent readline() calls from consuming too much member.  Patch by Jyrki
  Pulliainen.

  than 100 headers are read.  Adapted from patch by Jyrki Pulliainen.

  limiting the call to readline().  Original patch by Michał
  Jastrzębski and Giampaolo Rodola.

with test fixes by Serhiy Storchaka.

  limit line length.  Patch by Emil Lind.

Initial patch by Bruno Piguet.

This is implemented as if a useful .netrc file could exist without passwords,
which is possible in the general case; but in fact our netrc implementation
does not support it.  Fixing that issue will be an enhancement.

The SSLFakeFile.readline() method needs to support limiting readline() as
well.  It's not a full emulation of readline()'s signature, but this class
is only used by smtplib's code, so it doesn't have to be.

Modified version of original patch by Christian Heimes.

Issue #18709: GCC 4.6 complains that 'v' may be used uninitialized in GEN_EMAIL/GEN_URI/GEN_DNS case

  inside subjectAltName correctly. Formerly the module has used OpenSSL's
  GENERAL_NAME_print() function to get the string represention of ASN.1
  strings for `rfc822Name` (email), `dNSName` (DNS) and
  `uniformResourceIdentifier` (URI).

issue 16248.

  tkinter when the -E flag is passed to Python.  Patch by Zachary Ware.

  table internal to the pyexpat module's copy of the expat library to avoid a
  denial of service due to hash collisions.  Patch by David Malcolm with some
  modifications by the expat project.