Archive - at.Py - bite-sized Python tips for atmosci

131. 🐼 pandas for all your datetime needs

📆 Don't write your own date string parser; simply use pandas to parse it for you!

Sep 21, 2023 • at.Py

130. Speed up loading chunks of data with zarr

In the previous example, we rendered the satellite imagery from a TIF file.

Sep 20, 2023 • at.Py

129. 10848x10848 pixels, high-res satellite image taking forever to render?

You may not need the full resolution rendered on a global extent.

Sep 19, 2023 • at.Py

128. Want to compare YTD precipitation to climatology?

🐼 #pandas has a built-in cumsum method that will calculate the cumulative sum, grouped by year.

Sep 15, 2023 • at.Py

127. Unsure of when to use threads or processes?

Use threads for IO tasks (reading/writing to disk, downloading data) or subprocesses.

Sep 14, 2023 • at.Py

126. Want to interpolate an xarray Dataset?

🌟 The `interp` method is user-friendly!

Sep 13, 2023 • at.Py

125. Want to get all the unique station names without any imports?

Eliminate loops, which are extremely inefficient for large lists, and ifs when handling duplicates by using the built-in data type, `set`.

Sep 12, 2023 • at.Py

August 2023

124. Reiterate user input with repr

The repr function can be invaluable for echoing back user input precisely, particularly when the input contains spaces.

Aug 18, 2023 • at.Py

123. Want to check if a number is within a range in pandas?

The use case for this could be matching wind speed to some categorical scale (e.g.

Aug 16, 2023 • at.Py

122. Looking to save geometry types into parquet/database without adding custom extensions?

With geopandas, you can convert the geometry column into WKT (well-known text) format.

Aug 15, 2023 • at.Py

July 2023

121. Want to avoid re-downloading files unnecessarily?

Before downloading a file, check if it exists already.

Jul 25, 2023 • at.Py

120. Are nested lists causing complications within your DataFrame?

Working with lists in #pandas operations can be challenging, as functions like loc/query cannot be directly applied to them.

Jul 16, 2023 • at.Py

#nojs-banner { position: fixed; bottom: 0; left: 0; padding: 16px 16px 16px 32px; width: 100%; box-sizing: border-box; background: red; color: white; font-family: -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol"; font-size: 13px; line-height: 13px; } #nojs-banner a { color: inherit; text-decoration: underline; } This site requires JavaScript to run correctly. Please turn on JavaScript or unblock scripts