Can I round a PANDAS dataframe column in the same line that I edit the column?
Question:
Using Python 3.9
Using PANDAS, I’m trying to convert a column from feet to meters and then round the answer to three decimals. I currently have this:
df['col_m'] = df[col_f] * 0.3048
df['col_m'] = df['col_m'].round(3)
It gets the job done but is there a more efficient way to do this? Is it possible to do both actions in one line? I tried a couple different methods but the rounding ends up occurring too early if not separated like this. Thanks in advance.
Answers:
To perform it in one step, just chain the operations. Using mul in place of * makes it more convenient as you won’t need parentheses (in comparison to (df[col_f] * 0.3048).round(3)):
df['col_m'] = df[col_f].mul(0.3048).round(3)
Using Python 3.9
Using PANDAS, I’m trying to convert a column from feet to meters and then round the answer to three decimals. I currently have this:
df['col_m'] = df[col_f] * 0.3048
df['col_m'] = df['col_m'].round(3)
It gets the job done but is there a more efficient way to do this? Is it possible to do both actions in one line? I tried a couple different methods but the rounding ends up occurring too early if not separated like this. Thanks in advance.
To perform it in one step, just chain the operations. Using mul in place of * makes it more convenient as you won’t need parentheses (in comparison to (df[col_f] * 0.3048).round(3)):
df['col_m'] = df[col_f].mul(0.3048).round(3)