Merge pull request #309 from int3l/main

Code examples for episode 456

sample_code/ep456/README.md

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+# [python regex dynamic replacements (intermediate)](https://youtu.be/o_PD7AAbs4U)
+
+Today I show a cool technique for regex replacement in python!
+
+## Interactive examples
+
+### Bash
+
+```bash
+python t.py
+python t.py | flake8 -
+
+virtualenv venv
+. venv/bin/activate
+
+pip install yesqa
+yesqa src.py
+```

sample_code/ep456/rev01/src.py

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+import os  # noqa: F401
+
+print('hello demo')  # some comment
+
+# another comment here

sample_code/ep456/rev02/src.py

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+import os  # noqa: F401
+
+print('hello demo')  # noqa
+
+# another comment here

sample_code/ep456/rev02/t.py

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+import re
+
+with open('src.py') as f:
+    contents = f.read()
+
+comment = re.compile('#[^\n]+')
+
+print(comment.sub('', contents))

sample_code/ep456/rev03/src.py

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+import os  # noqa: F401
+
+print('hello demo')  # noqa
+
+# another comment here

sample_code/ep456/rev03/t.py

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+from __future__ import annotations
+from typing import Match
+
+import re
+
+with open('src.py') as f:
+    contents = f.read()
+
+comment = re.compile('#([^\n]+)')
+
+
+def cb(match: Match[str]) -> str:
+    return f'#{len(match[1]) * "."}'
+
+
+print(comment.sub(cb, contents), end='')

sample_code/ep456/rev04/src.py

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+import os  # noqa: F401
+
+print('hello demo')  # noqa
+
+# another comment here

sample_code/ep456/rev04/t.py

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+from __future__ import annotations
+from typing import Match
+
+import re
+
+with open('src.py') as f:
+    contents = f.read()
+
+comment = re.compile('(# ?)([^\n]+)')
+
+
+def cb(match: Match[str]) -> str:
+    return f'{match[1]}{len(match[2]) * "."}'
+
+
+print(comment.sub(cb, contents), end='')