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bpo-45616: Let py.exe distinguish between v3.1 and v3.10 (GH-29731)

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(cherry picked from commit f9de97aae5)

Co-authored-by: Zachary Ware <zach@python.org>
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Miss Islington (bot) 2021-11-23 21:02:32 -08:00 • committed by GitHub
parent 327c764fa2
commit ae065f8362
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2 changed files with 14 additions and 1 deletions
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4
Misc/NEWS.d/next/Windows/2021-11-23-11-44-42.bpo-45616.K52PLZ.rst Normal file
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@ -0,0 +1,4 @@
Fix Python Launcher's ability to distinguish between versions 3.1 and 3.10
when either one is explicitly requested. Previously, 3.1 would be used if
3.10 was requested but not installed, and 3.10 would be used if 3.1 was
requested but 3.10 was installed.

11
PC/launcher.c
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@ -542,8 +542,17 @@ find_python_by_version(wchar_t const * wanted_ver)
}
for (i = 0; i < num_installed_pythons; i++, ip++) {
n = wcslen(ip->version);
if (n > wlen)
/*
* If wlen is greater than 1, we're probably trying to find a specific
* version and thus want an exact match: 3.1 != 3.10. Otherwise, we
* just want a prefix match.
*/
if ((wlen > 1) && (n != wlen)) {
continue;
}
if (n > wlen) {
n = wlen;
}
if ((wcsncmp(ip->version, wanted_ver, n) == 0) &&
/* bits == 0 => don't care */
((bits == 0) || (ip->bits == bits))) {