Pandas 2.1.0 warning ''The 'method' keyword in Series.replace is deprecated and will be removed in a future version''

I have a pandas line of code that gives me a future deprecation warning as stated in the title and I can’t find in the pandas documentation how to modify it in order to remove the warning. The line of code is the following:

df['temp_open']=df['temp_open'].replace('',method='ffill')

Any help would be greatly appreciated.

I tried to fill blanks and it works, but I would like to get rid of the warning.

>Solution :

You can do this instead :

df["temp_open"] = df["temp_open"].replace("", None).ffill()

And if you want to keep the nulls (if any) untouched, you can use :

df["temp_open"] = (
    df["temp_open"].replace("", None).ffill().where(df["temp_open"].notnull())
)

Output :

print(df)

  temp_open
0         A
1         A
2       NaN
3         B
4         C
5         C

Used input :

df = pd.DataFrame({"temp_open": ["A", "", None, "B", "C", ""]})