assign a column transformed by a function (vectorised)

R:

stringlength = function(x) {nchar(x)} # trivial example
mtcars %>% mutate(x = stringlength(rowname))

pandas:

def stringlength(series):
  return series.astype(str).str.len()
mtcars.assign(x = stringlength(mtcars['name']))

dpython:

TODO

dply:

mtcars >> dp.mutate(x = dp.make_symbolic(stringlength)(X.name))

dppd:

dp(mtcars).mutate(x = stringlength(X.name)).pd