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| author | Eric V. Smith <ericvsmith@users.noreply.github.com> | 2019-05-08 20:28:48 (GMT) |
|---|---|---|
| committer | GitHub <noreply@github.com> | 2019-05-08 20:28:48 (GMT) |
| commit | 9a4135e939bc223f592045a38e0f927ba170da32 (patch) | |
| tree | de347c6f2df801dc98b36ab5084dada335741517 /Doc/whatsnew | |
| parent | 65d98d0f53f558d7c799098da0abf376068c15fd (diff) | |
| download | cpython-9a4135e939bc223f592045a38e0f927ba170da32.zip cpython-9a4135e939bc223f592045a38e0f927ba170da32.tar.gz cpython-9a4135e939bc223f592045a38e0f927ba170da32.tar.bz2 | |
bpo-36817: Add f-string debugging using '='. (GH-13123)
If a "=" is specified a the end of an f-string expression, the f-string will evaluate to the text of the expression, followed by '=', followed by the repr of the value of the expression.
Diffstat (limited to 'Doc/whatsnew')
| -rw-r--r-- | Doc/whatsnew/3.8.rst | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/Doc/whatsnew/3.8.rst b/Doc/whatsnew/3.8.rst index d6388f8..874b9b1 100644 --- a/Doc/whatsnew/3.8.rst +++ b/Doc/whatsnew/3.8.rst @@ -148,6 +148,20 @@ extensions compiled in release mode and for C extensions compiled with the stable ABI. (Contributed by Victor Stinner in :issue:`36722`.) +f-strings now support = for quick and easy debugging +----------------------------------------------------- + +Add ``=`` specifier to f-strings. ``f'{expr=}'`` expands +to the text of the expression, an equal sign, then the repr of the +evaluated expression. So:: + + x = 3 + print(f'{x*9 + 15=}') + +Would print ``x*9 + 15=42``. + +(Contributed by Eric V. Smith and Larry Hastings in :issue:`36817`.) + Other Language Changes ====================== |