How to replace column in a dataframe with column in another dataframe

Question

I have dataframe 1 like this:

df1 = 
index class   revenue  name
  0     q       1000      a    
  1     r       2000      b
  2     z       3000      c

And then I have dataframe 2 same like dataframe 1 but have different value in column revenue:

df2 =
index class   revenue  name
  0     q       6000      a    
  1     r       7000      b
  2     z       8000      c

I wanna replace column revenue in dataframe 1 with revenue in dataframe 2 :

df1 = 
index class   revenue  name
  0     q       6000      a    
  1     r       7000      b
  2     z       8000      c

Im already trying using :

1. df1= df1.replace(df1['revenue'],df2['revenue'])

2. df1= df1.assign(revenue = df2['revenue'])

But the output different with Im expected