Recoding a Variable in Python similar to R ifelse

Question

I am just new in Python, and I am trying to do an analysis. But before that, I want to recode some of the variables. I am wondering if this R code has an equivalent in Python.

df$col1 <- ifelse(df$col1 == "yes", 1, 0)

Here df is a pandas.DataFrame and col1 is one of its columns.

Answer 1

One possible option - probably the most similar to R's ifelse in terms of syntax - is to use the where function from numpy

import numpy as np

df['col1'] = np.where(df['col1'] == "Yes", 1, 0)