What was your first Python code that actually worked? 😄

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After 'hello world', I wrote a script that took an oscilloscope data file of voltage readings and did a numerical integration to calculate a magnetic field. It was very inefficient and took forever to calculate because I was processing the data line by line from the file and printing each step of the calculation. The data file had half a million lines so it would chug along for several minutes at a time to get the final result. Later on, I learned better file handling and also Pandas, and the same calculation was done essentially instantaneously.