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Python - string split on + (plus) sign

I have some DataFrame:

df = pd.DataFrame({'columnA': ['pizza_+_pasta', 'pizza_-_pasta', 'apple_+_bacon']})

Splitting on '_-_' works fine:

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But splitting on _+_ does not (!):

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What's going on?

需要逃离 +

df['columnA'].str.split(pat='_\+_', expand=True)

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