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QUESTION
I am still learning the idiosyncrasies of the Python language, and ran into something I find very strange. I could not find another post on SO about this, but please feel free to close as duplicate if I missed it.
The example is as follows:
...ANSWER
Answered 2022-Mar-31 at 23:44Many thanks in particular to @eyllanesc for their comments.
Based on this answer, and on the docs, the answer is called short-circuiting, and the behavior is rather unsual in Python in that the truthiness of the operands is evaluated to determine the return value, but the value of an operand (and not its truthiness) is returned.
In particular, the seemingly problematic examples in the OP are expected behavior, and can be explained with the following equivalences:
x and yis equivalent toy if bool(x) else xx or yis equivalent tox if bool(x) else y
QUESTION
python newbie here, I'm currently learning about nested functions in python. I'm having a particularly hard time understanding code from the example below. Particularly, at the bottom of the script, when you print echo(2)("hello") - how does the inner_function know to take that string "hello" as its argument input? in my head, I'd think you would have to pass the string as some sort of input to the outer function (echo)? Simply placing the string in brackets adjacent to the call of the outer function just somehow works? I can't seem to wrap my head around this..
-aspiring pythonista
...ANSWER
Answered 2022-Jan-16 at 13:23The important thing here is that in Python, functions themselves are objects, too. Functions can return any type of object, so functions can in principle also return functions. And this is what echo does.
So, the output of your function call echo(2) is again a function and echo(2)("hello") evaluates that function - with "hello" as an input argument.
Maybe it is easier to understand that concept if you would split that call into two lines:
QUESTION
How to replace some string with Nim ?
...ANSWER
Answered 2022-Jan-14 at 22:01First, you need to import strutils module. Strutils is the module that defines several common functions for working with strings.
So the code will be like this:
QUESTION
I am not a good python coder (beginner) so apologies if the code isn't up to pythonista's snuff! Bit of a weird situation and I can not figure this out. I have been wracking my brains trying to fix it out but can't seem to be able to. I am sure it's a really simple fix I am overlooking...
The "allData" Dataframe is pulling data from an SQL database. From that I am extracing a number of records and appending to the "managerListImput" empty dataframe. I am iterating for a number of records specified and looking up the details for each one before appending. It works in Jupyter notes and I get the desired output but when I run it in IDLE or Visual Studio Code I get an empty dataframe. Very frustrating. Hopefully someon can solve it.... Thanks in advance
Here's the code:
...ANSWER
Answered 2021-Dec-03 at 23:21The solution was simple: the managerID has to be turned into an integer, so I added this:
QUESTION
I'm using this code:
...ANSWER
Answered 2021-Jul-27 at 20:47NotImplementedError will occur if sympy can't find an analytic solution. You can solve this numerically instead:
QUESTION
fellow Pytoneers or Pythonistas,
I am hoping I can get your help on this issue:
I have more than one pandas data frames that contain as in the example below:
I would like to create a function that will count values from a list e.g. [a,b,c] and iterate through the columns and the data frames. I would like to return the total number of items found in the columns from the list. I wrote this code, but it doesn't seem to do the trick. Could you please help? Thank you in advance for your answers. PS: As I am new to this, my karma is quite low :D
...ANSWER
Answered 2021-Jul-14 at 09:20Join strings columns together and then count values by Series.str.count with joined values together and replaced missing values by empty string. Because there are some values of list with regex characters is necessary escape them by re.escape first:
In your solution:
QUESTION
I am trying to count common string values in sequential rows of a panda series using a user defined function and to write an output into a new column. I figured out individual steps, but when I put them together, I get a wrong result. Could you please tell me the best way to do this? I am a very beginner Pythonista!
My pandas df is:
...ANSWER
Answered 2021-May-22 at 12:34TRY:
QUESTION
Beginner Pythonista here
Making a betting game as part of an OOP exercise.
made a Player class with a bet function:
...ANSWER
Answered 2021-Apr-19 at 11:41Probably went through else statement, that does not return anything. Tried your code and it works as expected if you meet if criteria in bet function (one that has return)
QUESTION
So, I'm working on a function that will take a data list, and make a new list with items that repeat over a given number removed. So far, I have this while loop in the function
...ANSWER
Answered 2021-Mar-10 at 18:48j <= lengthData will let j reach a value beyond the last index in data which is lengthData-1 because Python list indexes are zero based.
Use while j < lengthData: instead
QUESTION
In the following program:
...ANSWER
Answered 2021-Mar-09 at 09:55Oops, you are playing with implementation details here. What the language says is that an object as a unique id, and if two objects have same id, then they are the same. This is mandated by the language.
Whether the id of a deleted object will be re-used by the next created object is clearly a detail, depending on the implementation and possibly on other details. So it may be the same or not, and without digging into the source of an implementation you cannot be sure of the result.
Only one thing is sure here, you should not rely on getting the same id.
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