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"python3-stdlib-extensions" versions published in Ubuntu

Eoan (3.7.5~rc1-1): main/python
Bionic-updates (3.6.8-1~18.04): main/python
Disco (3.7.3-1ubuntu1): main/python
Bionic (3.6.5-3): main/python
Xenial (3.5.1-1): main/python
Trusty-updates (3.4.3-1~14.04.2): main/python
Trusty (3.4.0-0ubuntu1): main/python
Precise (3.2.3-1): main/python