Python 3.5.0a2 installer fails on Windows

[pfmoore]

BPO	23619
Nosy	@terryjreedy, @pfmoore, @vstinner, @larryhastings, @nedbat, @tjguk, @ned-deily, @benhoyt, @zware, @zooba
Files	Installer.zip 35a2-failures.txt

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = 'https://github.com/zooba'
closed_at = <Date 2015-03-25.06:42:14.352>
created_at = <Date 2015-03-09.10:23:37.850>
labels = ['expert-installation', 'OS-windows']
title = 'Python 3.5.0a2 installer fails on Windows'
updated_at = <Date 2015-12-25.20:38:35.997>
user = 'https://github.com/pfmoore'

bugs.python.org fields:

activity = <Date 2015-12-25.20:38:35.997>
actor = 'steve.dower'
assignee = 'steve.dower'
closed = True
closed_date = <Date 2015-03-25.06:42:14.352>
closer = 'steve.dower'
components = ['Installation', 'Windows']
creation = <Date 2015-03-09.10:23:37.850>
creator = 'paul.moore'
dependencies = []
files = ['38407', '38415']
hgrepos = []
issue_num = 23619
keywords = []
message_count = 27.0
messages = ['237630', '237631', '237633', '237641', '237642', '237646', '237649', '237651', '237676', '237677', '237690', '237692', '237695', '237696', '237699', '237700', '237710', '237712', '237713', '237717', '237719', '237720', '237721', '237723', '239226', '256989', '257012']
nosy_count = 11.0
nosy_names = ['terry.reedy', 'paul.moore', 'vstinner', 'larry', 'nedbat', 'tim.golden', 'ned.deily', 'benhoyt', 'python-dev', 'zach.ware', 'steve.dower']
pr_nums = []
priority = 'critical'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue23619'
versions = ['Python 3.5']

[pfmoore]

I just tried to install the 64-bit "full installer" version, for
all users with the default options. This is on a PC that hasn't had
3.5 installed before, and doesn't have Visual Studio 2015 installed.
When it got to the step "precompiling standard library" I got an error window pop up saying "python.exe - system error. The program can't start because api-ms-win-crt-runtime-l1-1-0.dll is missing from your computer. Try reinstalling the program to fix this problem." All there was was an "OK" button. Pressing that told me "Setup was successful" but then "py -3.5 -V" gives me nothing (no error, no version, just returns me to the command prompt). Same result if I do "& 'C:\Program Files\Python 3.5\python.exe' -V".

Python 3.5.0a2 (64-bit) is showing in my "Add/Remove Programs".

This is Windows 7, 64-bit.

[vstinner]

"""
Two important notes for Windows users about Python 3.5.0a2:

• If you have previously installed Python 3.5.0a1, you must manually uninstall it before installing Python 3.5.0a2 (bpo-23612).
• If installing Python 3.5.0a2 as a non-privileged user, you may need to escalate to administrator privileges to install an update to your C runtime libraries.
  """

[pfmoore]

In this case as I said, no previous 3.50a1 installed. and I was doing an "all users" install (which prompted me for elevation, and I said OK)

[benhoyt]

Same exact issue here. I didn't have a Python 3.5 alpha 1 previously installed, and I tried running the installer normally and also (after uninstalling) with right-click, "Run as administrator".

Both do the same thing for me: pop up a dialog box at the end of installation that says "The program can't start because api-ms-win-crt-runtime-l1-1-0.dll is missing from your computer..."

I also get the same dialog box when I run "C:\Program Files\Python 3.5\python.exe"

[zooba]

If you look in your AppData\Local\Temp directory then you should find a whole pile of log files. Zipping those up and posting them here or emailing them to me would be great.

It sounds like the CRT update didn't install, since it's supposed to include that file.

[pfmoore]

Sent via private email as it's a work PC and I didn't check what's logged in there...

[vstinner]

Same error on my Windows 7 VM. I have VS 2008 & 2010 installed, but also Python 2.7, 3.3 and 3.4 (all installed twice: 32&64 bits). It's not a fresh Windows :-)

Here is a ZIP of Python 3.5* logs in my Temp directory. I cannot compress the whole directory, it's really huge :-) I have files which are 2 years old in this directory!?

Files:
Python 3.5.0a2 (64-bit)_20150309143635.log
Python 3.5.0a2 (64-bit)20150309143635_001...log
...
Python 3.5.0a2 (64-bit)20150309143635_010...log

Have fun!

[zooba]

I definitely don't want the whole directory, especially from Windows 7 :) (Later versions are better at cleaning up unused files)

I'll take a look once I get to work. Thanks

[python-dev]

New changeset 0469af231d22 by Steve Dower in branch 'default':
Issue bpo-23619: Ensure C variable is initialized before using it.
https://hg.python.org/cpython/rev/0469af231d22

[zooba]

Well that was embarrassing, but it's fixed now :)

Larry, would you like me to rebuild the installer with the fix in it?

[larryhastings]

Yup.