CODEWITHSUNDEEP
python-3.xpandas
Chris
Chris

Reputation: 1053

Pandas applymap loops twice, apply once?

Want to only use the first email if multiple are added. Made a function which looks for ',', if it finds it, displays a message and returns the first email.
For a strange reason, it seems to loop through the dataframe twice when using 'applymap', because it prints the message twice.

When I use the 'apply' function on the series, it -as expected-prints out once. Any idea why is this discrepancy?

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Upvotes: 0

Views: 194

Answers (1)

IMCoins
IMCoins

Reputation: 3306

From the documentation, version 0.25.0, I quote :

Notes

In the current implementation applymap calls func twice on the first column/row to decide whether it can take a fast or slow code path. This can lead to unexpected behavior if func has side-effects, as they will take effect twice for the first column/row.

Upvotes: 1

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