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Project Euler Project 67 – Python

I am doing the Project Euler #67 in Python. My program, which worked for Project 18, does not work for Project 67. Code (excludes the opening of the file and the processing of information): Variables: temp is the triangle of integers outputlist is a list which stores the numbers chosen by the program I know t…

Pandas: Pivot a DataFrame, columns to rows

I have a DataFrame defined like this: The DataFrame is now this: I want to pivot the DataFrame so that it then looks like this: I think I want to do this via pivoting, but I’ve not yet worked out how to do this using the pivot() or pivot_table()functions. How can I do this, with or without using a pivot…

Think Python 2nd Edition Exercise 7-1

“Square Roots” loop: Copy the loop from “Square Roots” and encapsulate it in a function called mysqrt that takes a as a parameter, chooses a reasonable value of x, and returns an estimate of the square root of a. To test it, write a function named test_square_root that prints a table like this: He…

How to make c++ return 2d array to python

I find an example showing how to return a 1D array from c++ to python. Now I hope to return a 2D array from c++ to python. I imitate the code shown in the example and my code is as follows: The file a.cpp: The file b.py: I run the following commands: Then I get the following prints: It seems

Rename nested field in spark dataframe

Having a dataframe df in Spark: How to rename field array_field.a to array_field.a_renamed? [Update]: .withColumnRenamed() does not work with nested fields so I tried this hacky and unsafe method: I know that setting a private attribute is not a good practice but I don’t know other way to set the schema…