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# koalas don't support iterrows. so we convert iterrows() to itertuples() format
if internal_itertuples:
  Row = namedtuple('Row', df.columns)
  def convert_iterrow_to_itertuples(df):
    for row in df.iterrows():
      yield Row(*row[1])

      itertuples = convert_iterrow_to_itertuples(df)

else:

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Linux network namespaces can be used to control which processes should be tunneled by OpenVPN.
http://www.naju.se/articles/openvpn-netns.html

Example
First create an --up and --down script for OpenVPN. This script will create the VPN tunnel interface inside a network namespace called vpn, instead of the default namespace.

cat > netns-script << 'EOF'
#!/bin/sh
case $script_type in
        up)

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# https://wiki.archlinux.org/title/Trusted_Platform_Module#Clevis

sudo dnf install clevis\*

# check the correct partition with lsbk
sudo lsblk

# bind clevis to secure boot
sudo clevis luks bind -d /dev/nvme0n1p3 tpm2 '{"pcr_ids":"1,7"}'

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apk update

# luci addons
apk add luci-app-statistics

# dns over tls
# https://openwrt.org/docs/guide-user/services/dns/dot_dnsmasq_stubby
# apk add dnsmasq stubby

# generic routing encapsulation. requirement for vpn.ua.pt 

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# CONDA

# create env
conda config --add channels conda-forge
conda config --set channel_priority strict
conda create --strict-channel-priority -n jupyter
conda activate jupyter

# jupyter, notebook and old notebook extensions
conda install -y jupyterlab 

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import logging

filename = 'spam.log'

logger = logging.getLogger()
logger.setLevel(logging.DEBUG)
# create file handler which logs even debug messages
fh = logging.FileHandler(filename)
fh.setLevel(logging.DEBUG)

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vbell off
term screen-256color
hardstatus off
hardstatus alwayslastline
hardstatus alwayslastline '%{= G}[ %{G}%H %{g}][%= %{= w}%?%-Lw%?%{= R}%n*%f %t%?%{= R}(%u)%?%{= w}%+Lw%?%= %{= g}][ %{y}Load: %l %{g}][%{B}%Y-%m-%d %{W}%c:%s %{g}]'
defnonblock on
scrollback 15000
setenv LD_PRELOAD /usr/lib/libjemalloc.so

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import logging

# level=logging._nameToLevel[verbosity_level]
# level=logging.DEBUG

# format="%(asctime)s [%(module)-12.12s] [%(levelname)-5.5s]  %(message)s",

logging.basicConfig(
    level=logging.DEBUG,
    format="%(asctime)s [%(levelname)-5.5s]  %(message)s",

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# tests the avalability of cuda for pytorch

import torch

torch.cuda.current_device()
torch.cuda.device(0)
torch.cuda.device_count()
torch.cuda.get_device_name(0)
torch.cuda.is_available()

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# trick to make iJulia work on CentOS 7

# CentOS looks like to have some kind of ABI incompatibility
# ERROR: LoadError: InitError: could not load library "/home/centos/.julia/artifacts/8b67c92bc6eb60d96d3488bf4b48bd3a38f70c53/lib/libzmq.so"
# /usr/bin/../lib64/libstdc++.so.6: version `GLIBCXX_3.4.20' not found (required by /home/centos/.julia/artifacts/8b67c92bc6eb60d96d3488bf4b48bd3a38f70c53/lib/libzmq.so)

]
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