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BUG: Fix formatting of complex floats with exponents #60405

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BUG: Fix formatting of complex floats with exponents #60405

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@snitish snitish commented Nov 23, 2024 •
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>>> input_array=[(1.8816e-09+0j), (3.39676e-09+0j)]
>>> pd.Series(input_array)
0    1.881600e-09+0.000000e+                    00j
1    3.396760e-09+0.000000e+                    00j
dtype: complex128

The issue was due to the regex in the _trim_zeros_complex function not being able to handle +/- in the exponent. It assumes the complex number string to be of the form (-)xxx(+/)yyyj. I fixed the regex so it doesn't split on +/- if preceded by an exponent.
Post the fix:

>>> input_array=[(1.8816e-09+0j), (3.39676e-09+0j)]
>>> pd.Series(input_array)
0    1.881600e-09+0.000000e+00j
1    3.396760e-09+0.000000e+00j
dtype: complex128

@snitish snitish mentioned this pull request Nov 23, 2024
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@snitish snitish changed the title Fix formatting of complex floats with exponents BUG: Fix formatting of complex floats with exponents Nov 23, 2024
mroeschke
mroeschke requested changes Nov 25, 2024
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Thanks for the PR. Could you also add a whatsnew note in v3.0.0.rst?

pandas/tests/io/formats/test_to_string.py
)
assert result == expected

# GH #60393
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Could you make this a separate test?

@mroeschke mroeschke added the Output-Formatting __repr__ of pandas objects, to_string label Nov 25, 2024
partev and others added 9 commits November 25, 2024 11:37
@snitish snitish closed this Nov 25, 2024
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snitish commented Nov 25, 2024

Looks like I broke my branch. Will re-raise the PR.

@snitish snitish deleted the complexbug branch November 25, 2024 19:40
@snitish snitish mentioned this pull request Nov 25, 2024
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@mroeschke mroeschke mroeschke requested changes

@MarcoGorelli MarcoGorelli Awaiting requested review from MarcoGorelli

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BUG: Printing of a pandas Series of complex numbers with e-notation has broken between 2.0.x and older versions and the newer 2.1.x, 2.2.x versions

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@snitish @mroeschke @partev @tuhinsharma121 @lfffkh