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A comment on Show HN: I am building a new Python library to read/write PDF files. Parent comment

Re:Show HN: I am building a new Python library to read/write... by BiteCode_dev on Friday November 18, 2022 @01:40AM (#33651162)
J is for complex numbers. While math.sqrt(-1) raises an exception, cmath.sqrt(-1) returns 1j.
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Re:Show HN: I am building a new Python library to read/write... by lordgrenville on Friday November 18, 2022 @05:32AM (#33652836)
Parent was referring to "references" in the PDF spec (eg 42 0 R)
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