I have a dataframe with columns A , B . I need to create a column C such that for every record / row: 2 Answers ...

...retty thoroughly. Imports are pretty straightforward really. Just remember the following: 'import' and 'from xxx import yyy' are executable statements. They execute when the running program reaches that line. If a module is not in sys.modules, then an import creates the new module ...

...loading, including for methods or constructors. If you want a function to behave differently depending on the number and types of parameters you pass to it, you'll have to sniff them manually. JavaScript will happily call a function with more or fewer than the declared number of arguments. functio...

What is the best way to assign to multiple columns using data.table ? For example: 2 Answers ...

Is it possible to sort and rearrange an array that looks like this: 21 Answers 21 ...

...oop requires a separate pass over the list for every count call, which can be catastrophic for performance. If you want to count all items, or even just multiple items, use Counter, as explained in the other answers. share ...

... Both Python dict (before Python 3.7) and JSON object are unordered collections. You could pass sort_keys parameter, to sort the keys: >>> import json >>> json.dumps({'a': 1, 'b': 2}) '{"b": 2, "a": 1}' >...

... export makes the variable available to sub-processes. That is, export name=value means that the variable name is available to any process you run from that shell process. If you want a process to make use of this variable, use export, and run ...

In the Python multiprocessing library, is there a variant of pool.map which supports multiple arguments? 19 Answers ...

Given two dataframes a and b : 5 Answers 5 ...