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To merge two DataFrames where the customer ID column has dif…

To merge two DataFrames where the customer ID column has different names (cust_id in one, customer in the other), use:

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Why does str.replace usually require regex=True when your pa…

Why does str.replace usually require regex=True when your pattern uses regex syntax?

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Which statement about st.button is correct?

Which statement about st.button is correct?

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To preserve a value across script reruns in Streamlit (e.g.,…

To preserve a value across script reruns in Streamlit (e.g., remembering whether the user clicked a button):

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Wide format means:

Wide format means:

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Trailing/leading whitespace in a string column is most clean…

Trailing/leading whitespace in a string column is most cleanly removed with:

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Which join keeps every row from BOTH DataFrames, with NaN fo…

Which join keeps every row from BOTH DataFrames, with NaN for unmatched values?

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Which is a quantifier in regex?

Which is a quantifier in regex?

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You have a column where 30% of values are missing, scattered…

You have a column where 30% of values are missing, scattered across many rows. The defensible default strategy is:

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To prevent an expensive data-loading function from re-runnin…

To prevent an expensive data-loading function from re-running every time a widget changes, use:

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