def test(df): df = df.copy(deep=True) df[‘tt’] = np.nan return df If you pass the dataframe into a function and manipulate it and return the same dataframe, you are going to get the same dataframe in modified version. If you want to keep your old dataframe and create a new dataframe with your modifications then by … Read more
this code is more general but maybe it can help you: import sqlite3 new_db = sqlite3.connect(‘:memory:’) # create a memory database old_db = sqlite3.connect(‘test.db’) query = “”.join(line for line in old_db.iterdump()) # Dump old database in the new one. new_db.executescript(query) EDIT : for getting your specify table you can just change in the for loop … Read more
class Organism(object): def reproduce(self): #use self here to customize the new organism … return Organism() Another option — if the instance (self) isn’t used within the method: class Organism(object): @classmethod def reproduce(cls): return cls() This makes sure that Organisms produce more Organisms and (hypothetical Borgs which are derived from Organisms produce more Borgs). A side … Read more
Depends. In general, you couldn’t physically copy anything larger than the largest usable register in a single cycle, but that’s not really how machines work these days. In practice, you really care less about what the CPU is doing and more about the characteristics of DRAM. The memory hierarchy of the machine is going to … Read more
if you are trying to Clone your database on the same server try this: Create a backup of the database you want to copy right-click on Databases and select Restore Database Select the database you want to copy from the From Database drop-down list in the Source for restore section Enter the name of the … Read more
To copy everything in a folder hierarchie Copy-Item $source $dest -Recurse -Force To copy the hierarchie you can try: $source = “C:\ProdData” $dest = “C:\TestData” Copy-Item $source $dest -Filter {PSIsContainer} -Recurse -Force To flatten a file structure you can try: $source = “C:\ProdData” $dest = “C:\TestData” New-Item $dest -type directory Get-ChildItem $source -Recurse | ` … Read more
List<Integer> copies = Collections.nCopies(copiesCount, value); javadoc here. This is better than the ‘Arrays.fill’ solution by several reasons: it’s nice and smooth, it consumes less memory (see source code) which is significant for a huge copies amount or huge objects to copy, it creates an immutable list, it can create a list of copies of an … Read more
In a general setting, retaining an object will increase its retain count by one. This will help keep the object in memory and prevent it from being blown away. What this means is that if you only hold a retained version of it, you share that copy with whomever passed it to you. Copying an … Read more
You have a few problems with the code. First problem in your code is the $(element).text()jquery text() strips your code from html including the <br> tags. So there is no newlines in the clipboard text since all html newlines are stripped away.. so nothing to replace. If you want to keep <br> as newlines you … Read more
Instead of calling clone on the array itself, you can call it on each of the array’s elements using map: b = a.map(&:clone) This works in the example stated in the question, because you get a new instance for each element in the array.