I have a pandas column with dtype 'object'
that contains numeric values and the value '?'
.
How should I proceed to count the number of rows that have the value '?'
?
I’m trying to run:
question_mark_count = df['column'].str.contains('?').sum()
in a column that has numeric value and some question marks ‘?’, but I’m getting the error:
AttributeError: Can only use .str accessor with string values!
When I run df.dtypes
, I can see that the column is 'object' type
.
I’ve also tried to convert the column to string:
df["column"] = df["column"].astype("string")
But I’m still getting the same error.
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Answer
to further explore possibilities:
df["column"].str.contains('?').value_counts()
immune to np.nan pd.NA ints floats
or whatever you have in your df['column']