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The Best of the Best Practices (BOBP) Guide for Python

A "Best of the Best Practices" (BOBP) guide to developing in Python.

In General

Values

• "Build tools for others that you want to be built for you." - Kenneth Reitz
• "Simplicity is alway better than functionality." - Pieter Hintjens

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docker images | awk '/([\w\.\-]+)/ { print $3 }' | xargs docker rmi

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cat words.txt | tr -s ' ' '\n' | sort | uniq -c | awk '{print $2" "$1}'

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# Instead of using hardcoded values, one can use the built-in
# slice() function, that returns a slice object. This object can
# then be used pretty much anywhere in sequences.
NAME = slice(2, 5)
records = [
	(1, "user", "Name1", "Middle Name1", "Surname1", 12345, "Y"),
	(1, "user", "Name2", "Middle Name2", "Surname2", 12346, "N"),
	(1, "user", "Name3", "Middle Name3", "Surname3", 12347, "Y"),
	(1, "user", "Name4", "Middle Name4", "Surname4", 12348, "Y"),
	(1, "user", "Name5", "Middle Name5", "Surname5", 12349, "N")

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# This works for hashable items in a sequence. This wouldn't work
# if the items are dictionaries, for example
# Of course, one could easily use set(), but the order wouldn't be 
# preserved.
def dedupe(items):
	seen = set()
	for item in items:
		if item not in seen:
			yield item
			seen.add(item)

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# Unpacking arbitrary number of elements
records = ["Name", "Email", 12345, 12346, 12347, 12348]
name, email, *phone_numbers = records
print(phone_numbers)  # [12345, 12346, 12347, 12348]

records = ["Name", 12345, 12346, 12347, 12348, "Email"]
name, *phone_numbers, email = records
print(phone_numbers)  # [12345, 12346, 12347, 12348]

name, *_, email = records