make new columns

Question 1

Assign new columns to a DataFrame, returning a new object (a copy) with the new columns added to the original ones. Existing columns that are re-assigned will be overwritten

Answer 1

df.assign(Area=lambda df: df.Length*df.Height)

Question 2

Add single column.

Answer 2

df[‘Volume’] = df.Length*df.Height*df.Depth

Question 3

Quantile-based discretization function. Discretize variable into equal-sized buckets based on rank or based on sample quantiles. For example 1000 values for 10 quantiles would produce a Categorical object indicating quantile membership for each data point.

Answer 3

pandas.qcut(x, q, labels=None, retbins=False, precision=3)

Question 4

Trim values at input thresholds

Answer 4

clip(lower=-10,upper=10)