grepl function in python

I want to recreate a snippet code from R to Python. I have this tibble from R (dataframe in Python) which is somehow look like this:

column1       column2                                 column3
amsterdam     het dag calamiteit bij doen gratis dag  2013
rotterdam     blijdorp groet gratis burp het ik ben   2015

with this code below, I tried to extract description as single character string. This is the code:

#R code
for (i in 1:nrow(tibble)) {
    des <- pull(tibble[i,2])
}

#Python code
for i in df:    
    des = df['column2'].str.split(expand=True).stack()

and then the series of des (we got from df['column']) would look like this in python:

het
dag
calamiteit
bij
doen
gratis
dag
blijdorp
groet
burp
het
ik
ben

But, then I want to recreate this code from R to Python which I don't know how:

if (grepl("^\\s*$", des) == TRUE) { # if description is only whitespace then skip
    trns <- tibble(translatedText = "", detectedSourceLanguage = "", text = "")

especially the grepl function.

What does it equal to in Python? and what's the best Python code to recreate that? thank you