<h3>Contribution description</h3>
<p>This PR cleans up the Python automated test script of the <code>tests/phydat_dump</code> application: regexp string should be marked as raw string to avoid the following flake8 errors:</p>
<pre><code>tests/sys/phydat_dump/tests/01-run.py:19:26: W605 invalid escape sequence '\['
tests/sys/phydat_dump/tests/01-run.py:19:29: W605 invalid escape sequence '\]'
tests/sys/phydat_dump/tests/01-run.py:20:21: W605 invalid escape sequence '\['
tests/sys/phydat_dump/tests/01-run.py:20:24: W605 invalid escape sequence '\]'
tests/sys/phydat_dump/tests/01-run.py:21:21: W605 invalid escape sequence '\['
tests/sys/phydat_dump/tests/01-run.py:21:24: W605 invalid escape sequence '\]'
tests/sys/phydat_dump/tests/01-run.py:22:26: W605 invalid escape sequence '\['
tests/sys/phydat_dump/tests/01-run.py:22:29: W605 invalid escape sequence '\]'
tests/sys/phydat_dump/tests/01-run.py:23:21: W605 invalid escape sequence '\['
tests/sys/phydat_dump/tests/01-run.py:23:24: W605 invalid escape sequence '\]'
tests/sys/phydat_dump/tests/01-run.py:24:21: W605 invalid escape sequence '\['
tests/sys/phydat_dump/tests/01-run.py:24:24: W605 invalid escape sequence '\]'
tests/sys/phydat_dump/tests/01-run.py:25:26: W605 invalid escape sequence '\['
tests/sys/phydat_dump/tests/01-run.py:25:29: W605 invalid escape sequence '\]'
tests/sys/phydat_dump/tests/01-run.py:26:21: W605 invalid escape sequence '\['
tests/sys/phydat_dump/tests/01-run.py:26:24: W605 invalid escape sequence '\]'
tests/sys/phydat_dump/tests/01-run.py:27:21: W605 invalid escape sequence '\['
tests/sys/phydat_dump/tests/01-run.py:27:24: W605 invalid escape sequence '\]'
tests/sys/phydat_dump/tests/01-run.py:28:26: W605 invalid escape sequence '\['
tests/sys/phydat_dump/tests/01-run.py:28:29: W605 invalid escape sequence '\]'
tests/sys/phydat_dump/tests/01-run.py:29:21: W605 invalid escape sequence '\['
tests/sys/phydat_dump/tests/01-run.py:29:24: W605 invalid escape sequence '\]'
tests/sys/phydat_dump/tests/01-run.py:30:21: W605 invalid escape sequence '\['
tests/sys/phydat_dump/tests/01-run.py:30:24: W605 invalid escape sequence '\]'
tests/sys/phydat_dump/tests/01-run.py:31:26: W605 invalid escape sequence '\['
tests/sys/phydat_dump/tests/01-run.py:31:29: W605 invalid escape sequence '\]'
tests/sys/phydat_dump/tests/01-run.py:32:21: W605 invalid escape sequence '\['
tests/sys/phydat_dump/tests/01-run.py:32:24: W605 invalid escape sequence '\]'
tests/sys/phydat_dump/tests/01-run.py:33:21: W605 invalid escape sequence '\['
tests/sys/phydat_dump/tests/01-run.py:33:24: W605 invalid escape sequence '\]'
tests/sys/phydat_dump/tests/01-run.py:34:43: W605 invalid escape sequence '\^'
tests/sys/phydat_dump/tests/01-run.py:35:43: W605 invalid escape sequence '\^'
tests/sys/phydat_dump/tests/01-run.py:36:26: W605 invalid escape sequence '\['
tests/sys/phydat_dump/tests/01-run.py:36:29: W605 invalid escape sequence '\]'
tests/sys/phydat_dump/tests/01-run.py:37:21: W605 invalid escape sequence '\['
tests/sys/phydat_dump/tests/01-run.py:37:24: W605 invalid escape sequence '\]'
tests/sys/phydat_dump/tests/01-run.py:38:21: W605 invalid escape sequence '\['
tests/sys/phydat_dump/tests/01-run.py:38:24: W605 invalid escape sequence '\]'
tests/sys/phydat_dump/tests/01-run.py:39:26: W605 invalid escape sequence '\['
tests/sys/phydat_dump/tests/01-run.py:39:29: W605 invalid escape sequence '\]'
tests/sys/phydat_dump/tests/01-run.py:40:21: W605 invalid escape sequence '\['
tests/sys/phydat_dump/tests/01-run.py:40:24: W605 invalid escape sequence '\]'
tests/sys/phydat_dump/tests/01-run.py:41:21: W605 invalid escape sequence '\['
tests/sys/phydat_dump/tests/01-run.py:41:24: W605 invalid escape sequence '\]'
tests/sys/phydat_dump/tests/01-run.py:60:45: W605 invalid escape sequence '\^'
tests/sys/phydat_dump/tests/01-run.py:61:45: W605 invalid escape sequence '\^'
</code></pre>

<h3>Testing procedure</h3>
<ul>
<li>A green CI</li>
<li><code>tests/phydat_dump</code> test is still working:</li>
</ul>
<details>
<pre><code>$ make -C tests/phydat_dump all test --no-print-directory 
Building application "tests_phydat_dump" for "native" with MCU "native".

"make" -C /work/riot/RIOT/boards/native
"make" -C /work/riot/RIOT/boards/native/drivers
"make" -C /work/riot/RIOT/core
"make" -C /work/riot/RIOT/cpu/native
"make" -C /work/riot/RIOT/cpu/native/periph
"make" -C /work/riot/RIOT/cpu/native/stdio_native
"make" -C /work/riot/RIOT/drivers
"make" -C /work/riot/RIOT/drivers/periph_common
"make" -C /work/riot/RIOT/sys
"make" -C /work/riot/RIOT/sys/auto_init
"make" -C /work/riot/RIOT/sys/fmt
"make" -C /work/riot/RIOT/sys/phydat
"make" -C /work/riot/RIOT/sys/test_utils/interactive_sync
/usr/bin/ld: /work/riot/RIOT/tests/phydat_dump/bin/native/cpu/tramp.o: warning: relocation against `_native_saved_eip' in read-only section `.text'
/usr/bin/ld: warning: creating DT_TEXTREL in a PIE
   text    data     bss     dec     hex filename
  31057     978   47812   79847   137e7 /work/riot/RIOT/tests/phydat_dump/bin/native/tests_phydat_dump.elf
r
/work/riot/RIOT/tests/phydat_dump/bin/native/tests_phydat_dump.elf  
RIOT native interrupts/signals initialized.
LED_RED_OFF
LED_GREEN_ON
RIOT native board initialized.
RIOT native hardware initialization complete.

Help: Press s to start test, r to print it is ready
READY
s
START
main(): This is RIOT! (Version: 2021.01-devel-573-g7010e3-pr/tests/phydat_dump_script_enh)
Visual phydat test application
Data:             12.34 °C
Data:             12.34 °F
Data:             123.4 K
Data:             123.4 lx
Data:   [0]        1234 m
        [1]       13456 m
        [2]      -14567 m
Data:   [0]      1234e1 m
        [1]     13456e1 m
        [2]    -14567e1 m
Data:   [0]        1234 km
        [1]       13456 km
        [2]      -14567 km
Data:   [0]       12.34 m
        [1]      134.56 m
        [2]     -145.67 m
Data:   [0]        1234 mm
        [1]       13456 mm
        [2]      -14567 mm
Data:          -0.12345 m^2
Data:         -12345e-6 m^3
Data:   [0]        0.12 g
        [1]        0.34 g
        [2]       56.78 g
Data:   [0]         123 mdps
        [1]         345 mdps
        [2]         678 mdps
Data:            1234.5 G
Data:             12345 kA
Data:             12345 MV
Data:           12345e7 W
Data:            1234.5 Gs
Data:            12.345 dBm
Data:             12345 C
Data:             12345 uF
Data:          12345e-7 F
Data:            123.45 pH
Data:             12345 Bar
Data:             12345 hPa
Data:            123.45 cd
Data:             12345 mcts
Data:            12.345 %
Data:            1.2345 permille
Data:             12345 uppm
Data:             12345 nppb
Data:            1234.5 g/m^3
Data:            1234.5 #/m^3
Data:   12:34:56
Data:   2020-02-27

</code></pre>
</details>

<h3>Issues/PRs references</h3>
<p>Raised when running the static test locally in <a class="issue-link js-issue-link" data-error-text="Failed to load title" data-id="734522664" data-permission-text="Title is private" data-url="https://github.com/RIOT-OS/RIOT/issues/15358" data-hovercard-type="pull_request" data-hovercard-url="/RIOT-OS/RIOT/pull/15358/hovercard" href="https://github.com/RIOT-OS/RIOT/pull/15358">#15358</a></p>


<hr>

<h4>You can view, comment on, or merge this pull request online at:</h4>
<p>  <a href='https://github.com/RIOT-OS/RIOT/pull/15373'>https://github.com/RIOT-OS/RIOT/pull/15373</a></p>

<h4>Commit Summary</h4>
<ul>
  <li>tests/shell: fix flake8 errors in Python script</li>
</ul>

<h4>File Changes</h4>
<ul>
  <li>
    <strong>M</strong>
    <a href="https://github.com/RIOT-OS/RIOT/pull/15373/files#diff-9a761ff96565eec53e31b0a9f54d07dc1545f88661a4ba3fc4a8aa1a3c52908e">tests/shell/tests/01-run.py</a>
    (4)
  </li>
</ul>

<h4>Patch Links:</h4>
<ul>
  <li><a href='https://github.com/RIOT-OS/RIOT/pull/15373.patch'>https://github.com/RIOT-OS/RIOT/pull/15373.patch</a></li>
  <li><a href='https://github.com/RIOT-OS/RIOT/pull/15373.diff'>https://github.com/RIOT-OS/RIOT/pull/15373.diff</a></li>
</ul>

<p style="font-size:small;-webkit-text-size-adjust:none;color:#666;">—<br />You are receiving this because you are subscribed to this thread.<br />Reply to this email directly, <a href="https://github.com/RIOT-OS/RIOT/pull/15373">view it on GitHub</a>, or <a href="https://github.com/notifications/unsubscribe-auth/ABE7WYGEUY3U4WPQSM5ERRLSOALGBANCNFSM4TI3FVUA">unsubscribe</a>.<img src="https://github.com/notifications/beacon/ABE7WYBSFGLOWFPHWCHICJLSOALGBA5CNFSM4TI3FVUKYY3PNVWWK3TUL52HS4DFUVEXG43VMWVGG33NNVSW45C7NFSM4K6VGKPQ.gif" height="1" width="1" alt="" /></p>
<script type="application/ld+json">[
{
"@context": "http://schema.org",
"@type": "EmailMessage",
"potentialAction": {
"@type": "ViewAction",
"target": "https://github.com/RIOT-OS/RIOT/pull/15373",
"url": "https://github.com/RIOT-OS/RIOT/pull/15373",
"name": "View Pull Request"
},
"description": "View this Pull Request on GitHub",
"publisher": {
"@type": "Organization",
"name": "GitHub",
"url": "https://github.com"
}
}
]</script>