Sample query: I have the following indexed DataFrame with named columns and rows not- continuous numbers: I would like to add a new column, ‘e’, to the existing data frame and …
How to add a new column to an existing DataFrame? Learn MoreQuery explained: I’ve been given to understand that Python is an interpreted language…However, when I look at my Python source code I see .pyc files, which Windows identifies as “Compiled Python Files”. Where do …
If Python is interpreted, what are .pyc files? Learn MoreQuery explained: So what I’m looking for here is something like PHP’s print_r function. This is so I can debug my scripts by seeing what’s the state of the object in question. …
How to print all the current properties and values of an object in Python Learn MoreThe sample query has been explained below. How to get a list from Pandas DataFrame column headers? You can get the values as a list by doing: Also, you can …
Get a list from Pandas DataFrame column headers Learn MoreQuery explained: Is there a way to declare a constant in Python? In Java we can create constant values in this manner: What is the equivalent of the above Java …
How to create a constant in Python? Learn MoreQuery: I’m used to doing print >>f, “hi there” However, it seems that print >> is getting deprecated. What is the recommended way to do the line above? Update: Regarding all those answers …
How to write a line to file in Python? Learn MoreIn this post, we’ll learn how to add new keys to a dictionary in Python. How to add new keys to a dictionary in Python? You create a new key/value …
How to add new keys to a dictionary in Python? Learn MoreIn this post, we’ll learn the difference between __str__ and __repr__ in Python. As answered by Ned, my rule of thumb: __repr__ is for developers, __str__ is for customers. Now, what is the difference …
What is the difference between __str__ and __repr__? Learn MoreQuery: I’m looking for a string.contains or string.indexof method in Python. I want to do: Does Python have a string ‘contains’ substring method? No, it doesn’t if you want string.contains(), but you can use …
Does Python have a string ‘contains’ substring method? Learn MoreAnswer: Maybe a bit of example code will help: Notice the difference in the call signatures of foo, class_foo and static_foo: Below is the usual way an object instance calls a method. The object …
What is the difference between staticmethod and classmethod in Python? Learn MoreMetaclasses in Python explained: Classes as objects Before understanding metaclasses, you need to master classes in Python. And Python has a very peculiar idea of what classes are, borrowed from …
What are metaclasses in Python? [Answered] Learn MoreIn this post, we’ll learn how to use the ternary operator in python. Does Python have a ternary conditional operator? Yes, it was added in version 2.5. The expression syntax is: First condition is …
What is the ternary conditional operator in Python? Learn MoreQuery: Given the following code, what does the if __name__ == “__main__”: do? What does if __name__ == “__main__“: do? Answer #1: Short Answer It’s boilerplate code that protects users from accidentally …
What does if __name__ == “__main__”: do in Python? [Answered] Learn MoreSample query: I have a dataframe along the lines of the below: I want to add another column to the dataframe (or generate a series) of the same length as …
How to create conditional columns in pandas dataframe/series? [Answered] Learn MoreSample query: How can I achieve the equivalents of SQL’s IN and NOT IN? I have a list with the required values. Here’s the scenario: My current way of doing this is as …
How to filter Pandas dataframe using ‘in’ and ‘not in’ like in SQL? [Answered] Learn MoreSample problem: Yes, I know this subject has been covered before, but as far as I know, all solutions, except for one, fail on a list like this: Where the …
How to flatten an irregular list of lists? [Answered] Learn MoreProblem explained: I’ve created this simple GUI: I get the UI up and running. When I click on the Grab button, I get the following error on the console: Why is entryBox set to None? …
Tkinter: AttributeError: NoneType object has no attribute