Pandas - 标签 - William https://williamlfang.github.io/tags/pandas/ Pandas - 标签 | William Hugo -- gohugo.iozh-CNThu, 15 Oct 2026 11:20:12 +0900 Logging a full pandas DataFrame from an f-string: rebuild it from the caller's source https://williamlfang.github.io/2026-10-15-log-full-dataframe-from-fstring/ Thu, 15 Oct 2026 11:20:12 +0900 william https://williamlfang.github.io/2026-10-15-log-full-dataframe-from-fstring/ A daily script of mine logs its intermediate DataFrames with log.crt(f"""...{tgt = }..."""). The log showed 10 of the 90 rows, with the header stuck to the end of tgt = . Switching to tgt.to_string() printed every row, but the header ended up two columns left of the data.

The fix I ended up with keeps the f-string as it is and adds one argument: log.crt(f"...{tgt = }...", full=True). That looks impossible, because the f-string is already built when the logger runs. The logger gets around it by finding the f-string in the caller’s source and evaluating it a second time.

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