I have a dataframe with missing data in several columns. In some of these columns, say ‘Col_A’ to ‘Col_D’, I’d like to replace them with 0. I tried it this way: reduce(lambda x : df.fillna({x : 0}, …

# Tag: lambda

## Adding functions y(x) together in python – impossible?

I’m currently trying to solve an engineering problem where I need to solve relatively long differential equations, for which I’m using the method odeint from scipy. I changed my problem to more easy …

## Factorial function using lambda

I am trying to implement the function below into one line of lambda code. def fac(num): num = int(num) if num > 1: return num * fac(num – 1) else: return 1 I have …

## Pandas – iloc – comparing value to the cell below

For the following table: Using Pandas – I would like achieve the desired_output column, that is TRUE when the value below the current cell i different – otherwise FALSE. I have tried the following code – but error occurs. AdvertisementAnswer

## Avoiding Default Argument Value is Mutable Warning (PyCharm)

Code: def evaluate_fruit(fruits): for fruit in fruits: if fruit == “Apple”: print(“Good choice!”) else: print(“Meh its okay”) list_o_fruits = [“Apple”, “…

## Using filter and lambda in a list of lists

I working with a list of lists. Each of those lists are the same — they contain title, url and some additional statistics (always in the same order). I would like to create a function find_title, which takes the wanted title and returns the whole list (with title, url and statistics). That’s my attempt However […]

## Nested lambda statements when sorting lists

I wish to sort the below list first by the number, then by the text. lst = [‘b-3’, ‘a-2’, ‘c-4’, ‘d-2’] # result: # [‘a-2’, ‘d-2’, ‘b-3’, ‘c-4’] Attempt 1 res = sorted(lst, key=lambda x: (int(x….

## How to use await in a python lambda

I’m trying to do something like this: mylist.sort(key=lambda x: await somefunction(x)) But I get this error: SyntaxError: ‘await’ outside async function Which makes sense because the lambda is not …

## python max function using ‘key’ and lambda expression

I come from OOP background and trying to learn python. I am using the max function which uses a lambda expression to return the instance of type Player having maximum totalScore among the list players. The function correctly returns instance of type Player having maximum totalScore. I am confused about the following three things: How […]

## python: union keys from multiple dictionary?

I have 5 dictionaries and I want a union of their keys. I tried but it gave me an error Am I doing it wrong ? I using normal forloop but I wonder why the above code didn’t work. Answer Your solution works for the first two elements in the list, but then dict1 and dict2 got reduced into a