C-API Pure Embedding enhancement

[JustinHuang]

BPO	24652
Nosy	@vstinner

^{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 = None
closed_at = None
created_at = <Date 2015-07-17.08:10:49.601>
labels = ['type-bug', '3.8', '3.9', '3.10', 'expert-C-API', '3.7', 'docs']
title = 'C-API Pure Embedding enhancement'
updated_at = <Date 2020-06-25.09:34:27.372>
user = 'https://bugs.python.org/JustinHuang'

bugs.python.org fields:

activity = <Date 2020-06-25.09:34:27.372>
actor = 'vstinner'
assignee = 'docs@python'
closed = False
closed_date = None
closer = None
components = ['Documentation', 'C API']
creation = <Date 2015-07-17.08:10:49.601>
creator = 'Justin Huang'
dependencies = []
files = []
hgrepos = []
issue_num = 24652
keywords = []
message_count = 1.0
messages = ['246847']
nosy_count = 3.0
nosy_names = ['vstinner', 'docs@python', 'Justin Huang']
pr_nums = []
priority = 'normal'
resolution = None
stage = None
status = 'open'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue24652'
versions = ['Python 3.6', 'Python 3.7', 'Python 3.8', 'Python 3.9', 'Python 3.10']

[JustinHuang]

From the example in here:

https://docs.python.org/2/extending/embedding.html#pure-embedding

when directly using the example (compiling and trying with external file etc.) it doesn't work right away. Instead an extra line:

    PySys_SetArgv(argc, argv);

must be added to get it to work.