new file: regular_expressions.md

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Add Python Databases certificate

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Add Python Databases certificate

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modified: stepik_while/while.py

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edits

intro polishing

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notebooks and text instructions, without translation

SUPPORT.md committed

Merge pull request #37 from Ligh7Fun/main_venv

days 3 and 4 fixes

header fixed

contrib added

add contrib

Fix typo

Expand ch10-3 solution

Fix technical typo

Merge pull request #83 from realpython/fix_typos_ch08

One more typo

Add source material from second edition

Change deprecated pd.datetools.timedelta to datetime.timedelta

Merge pull request #145 from choldgraf/35binder

env.yml

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