Updating Values of Dataframe Column Pandas

Question

I am trying to update a column in my pandas dataframe but cannot figure out how to do it. I think I need to use .update, but I am not sure how.

My current dataframe looks like this (called auto_df):

id	Make	Make (Encoded)	Model	Model (Encoded)	Score	Price
105	Kia	14	Forte Lx	103	0.0	15000
106	Nissan	21	Sentra S	181	0.0	14998
107	Toyota	26	Avalon Xl	22	0.0	14995
108	Chevrolet	4	Camaro Lt	34	0.0	14995
109	Kia	14	Sportage Lx	204	0.0	14995

I have another dataframe with updated score values (called auto_df_non), and I want to replace the 0 values in this dataframe with the updated score values.

auto_df_non looks like this:

id	Make	Make (Encoded)	Model	Model (Encoded)	Score	Price
105	Kia	14	Forte Lx	103	44.439907	15000
106	Nissan	21	Sentra S	181	27.530042	14998
107	Toyota	26	Avalon Xl	22	56.666503	14995
108	Chevrolet	4	Camaro Lt	34	16.844859	14995
109	Kia	14	Sportage Lx	204	14.013014	14995

I have tried to get .update to work, but everything I have found on the internet so far has not been helpful.

Answer 1

Example

we need minimal and reproducible example for answer. lets make

df1 = pd.DataFrame([['a', 0, 'c'], ['b', 0, 'd']], columns=['col1', 'col2', 'col3'])
df2 = pd.DataFrame([['a', 10, 'e'], ['b', 20, 'f']], columns=['col1', 'col2', 'col4'])

df1

   col1 col2    col3
0   a   0       c
1   b   0       d

df2

   col1 col2    col4
0   a   10      e
1   b   20      f

---

Code

df1.update(df2)

df1

  col1  col2    col3
0   a   10      c
1   b   20      d