How to divide column in dataframe by values in a dict according to some key?

I have a dataframe df with the columns delta and integer_id. I have a dict d that maps integer_id to some floating point value. I want to divide each row's delta in df by the corresponding value from d for the integer_id, and if the row's integer_id doesn't exist in the dict, leave delta unchanged.

Here's an example:

df = pd.DataFrame({
  "integer_id": [1, 2, 3],
  "delta": [10, 20, 30]
})
d = {1: 0.5, 3: 0.25}

The result should be

df = pd.DataFrame({
  "integer_id": [1, 2, 3],
  "delta": [20, 20, 120] # note the middle element is unchanged
})

I tried df["delta"] /= df.integer_id.map(d), but this will return NaN for the second row because d doesn't have the corresponding key. But something like

df["delta"] /= df.integer_id.map(lambda x: d.get(x, 1))

will get what I need, but I'm wondering what other approaches there are for this case?

source https://stackoverflow.com/questions/77545270/how-to-divide-column-in-dataframe-by-values-in-a-dict-according-to-some-key

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