Add column in dataframe from list

Question

I have a dataframe with some columns like this:

A   B   C  
0   
4
5
6
7
7
6
5

The possible range of values in A are only from 0 to 7

Answer 1

Just assign the list directly:

df['new_col'] = mylist

---

Alternative
Convert the list to a series or array and then assign:

se = pd.Series(mylist)
df['new_col'] = se.values

or

df['new_col'] = np.array(mylist)