.getMonth() returns a zero-based number so to get the correct month you need to add 1, so calling .getMonth() in may will return 4 and not 5. So in your code we can use currentdate.getMonth()+1 to output the correct value. In addition: .getDate() returns the day of the month <- this is the one you … Read more
See pandas: IO tools for all of the available .read_ methods. Try the following code if all of the CSV files have the same columns. I have added header=0, so that after reading the CSV file’s first row, it can be assigned as the column names. import pandas as pd import glob import os path … Read more
Yes: list1 + list2. This gives a new list that is the concatenation of list1 and list2.
In alphabetical order: std::string name = “John”; int age = 21; std::string result; // 1. with Boost result = name + boost::lexical_cast<std::string>(age); // 2. with C++11 result = name + std::to_string(age); // 3. with FastFormat.Format fastformat::fmt(result, “{0}{1}”, name, age); // 4. with FastFormat.Write fastformat::write(result, name, age); // 5. with the {fmt} library result = fmt::format(“{}{}”, … Read more
This post aims to give readers a primer on SQL-flavored merging with Pandas, how to use it, and when not to use it. In particular, here’s what this post will go through: The basics – types of joins (LEFT, RIGHT, OUTER, INNER) merging with different column names merging with multiple columns avoiding duplicate merge key … Read more
vector1.insert( vector1.end(), vector2.begin(), vector2.end() );
Use str.join: >>> words = [‘this’, ‘is’, ‘a’, ‘sentence’] >>> ‘-‘.join(words) ‘this-is-a-sentence’ >>> ‘ ‘.join(words) ‘this is a sentence’
Version 1 is preferable because it is shorter and the compiler will in fact turn it into version 2 – no performance difference whatsoever. More importantly given we have only 3 properties it might not make a difference, but at what point do you switch from concat to builder? At the point where you’re concatenating … Read more
The .push method can take multiple arguments. You can use the spread operator to pass all the elements of the second array as arguments to .push: >>> a.push(…b) If your browser does not support ECMAScript 6, you can use .apply instead: >>> a.push.apply(a, b) Or perhaps, if you think it’s clearer: >>> Array.prototype.push.apply(a,b) Please note … Read more
I found a one-line solution from the good old Apache Commons Lang library. ArrayUtils.addAll(T[], T…) Code: String[] both = ArrayUtils.addAll(first, second);