replace part of the string in pandas data frame

I have pandas data frame in which I need to replace one part of the vale with another value

for Example. I have

HF - Antartica
HF - America
HF - Asia

out of which I’d like to replace ony the HF - part thus the result would be

Hi Funny Antartica
Hi Funny America
Hi Funny Asia

I have tried pd.replace() but it doesnt work as I need only one part of the string replaced, rather than the entire string

Answer

It seems you need Series.replace:

print (df)
              val
0  HF - Antartica
1    HF - America
2       HF - Asia

print (df.val.replace({'HF -':'Hi'}, regex=True))
0    Hi Antartica
1      Hi America
2         Hi Asia
Name: val, dtype: object

Similar solution with str.replace:

print (df.val.str.replace('HF -', 'Hi'))
0    Hi Antartica
1      Hi America
2         Hi Asia
Name: val, dtype: object