Yann Vernier questions

Yann Vernier answers

• How does os.system differ from command line?
• Is it possible to mark a potentially uninitialized variable as good without using unsafe or panicking?
• How to minimize space cost when using itertools.tee to check the next element?
• Quicksort implementation in Python
• Get the size of a folder in Linux server
• 2-d array using Python's array.array module?
• Get previous object without len(list)
• python - os.getenv and os.environ don't see environment variables of my bash shell
• Why does this Python snippet regarding dictionaries work? [duplicate]
• Why does a doubly-reversed iterator act as if it was never reversed?