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The Basics of Indexing and Slicing Python Lists

  • I was preparing to demonstrate indexing and slicing lists to a group of fellow Python beginners a few days ago, and I got stuck on what seemed like a couple of pretty basic use cases.
  • Accessing the items in a list (and in other iterables like tuples and strings) is a fundamental skill for Python coders, and many Python tools follow similar conventions for indexing and slicing (e.g. numpy Arraysand pandas DataFrames).
  • You might say my juror number was my index.
  • When they said, “Jurors 37 through 48, please report back at 3:30 pm,” that slice of the larger group collectively sighed and went to lunch.
  • This was something I got tripped up on, but here’s what’s happening: in order to be included in the slice, an element must be at or to the right of the start boundary AND to the left of the stop boundary.

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The Basics of Indexing and Slicing Python Lists

  • I was preparing to demonstrate indexing and slicing lists to a group of fellow Python beginners a few days ago, and I got stuck on what seemed like a couple of pretty basic use cases.
  • Accessing the items in a list (and in other iterables like tuples and strings) is a fundamental skill for Python coders, and many Python tools follow similar conventions for indexing and slicing (e.g. numpy Arraysand pandas DataFrames).
  • You might say my juror number was my index.
  • When they said, “Jurors 37 through 48, please report back at 3:30 pm,” that slice of the larger group collectively sighed and went to lunch.
  • This was something I got tripped up on, but here’s what’s happening: in order to be included in the slice, an element must be at or to the right of the start boundary AND to the left of the stop boundary.

save | comments | report | share on


The Basics of Indexing and Slicing Python Lists

  • I was preparing to demonstrate indexing and slicing lists to a group of fellow Python beginners a few days ago, and I got stuck on what seemed like a couple of pretty basic use cases.
  • Accessing the items in a list (and in other iterables like tuples and strings) is a fundamental skill for Python coders, and many Python tools follow similar conventions for indexing and slicing (e.g. numpy Arraysand pandas DataFrames).
  • You might say my juror number was my index.
  • When they said, “Jurors 37 through 48, please report back at 3:30 pm,” that slice of the larger group collectively sighed and went to lunch.
  • This was something I got tripped up on, but here’s what’s happening: in order to be included in the slice, an element must be at or to the right of the start boundary AND to the left of the stop boundary.

save | comments | report | share on