feat(punishment): add new python exercise to scripting piscine

sh/tests/punishment_test.py

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+import sys
+
+sys.path.append('/jail/app/student')
+
+from punishment import do_punishment
+
+def test_empty_lines():
+    assert do_punishment("", "", 3) == " .\n .\n .\n"
+
+def test_empty():
+    assert do_punishment("", "", 0) == ""
+
+def test_truncation():
+    assert do_punishment("   Test for   ", "   truncating strings ", 1) == "Test for truncating strings.\n"

sh/tests/solutions/punishment.py

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+def do_punishment(first_part, second_part, nb_lines):
+    first_part = first_part.strip() + " "
+    second_part = second_part.strip() + ".\n"
+
+    res = ""
+    for _ in range(0, nb_lines):
+        res += first_part + " " + second_part + "oiewoiew.\n"
+    return res

subjects/devops/punishment/README.md

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+## Punishment
+
+### Instructions
+
+Often in schools we are asked to copy hundreds of sentences in order to better remember not to do something, this punishment is very old and quite boring!
+
+Hopefully we now have Python that can do the job for us.
+In order to do so create a file `punishment.py` which will contain a function `do_punishment` having 3 arguments:
+- `first_part`: which will be a string.
+- `second_part`: which will be also a string.
+- `nb_lines`: which will be a number.
+
+Here is the prototype of the function:
+```python
+def do_punishment(first_part, second_part, nb_lines):
+```
+
+The function will concatenate `first_part` and `second_part`, adding a space in between them and a `.` at the end of `second_part`. It will repeat this process for `nb_lines` times.
+
+The function will return a single string containing all the repeated sentences.
+
+> In case `first_part` and `second_part` have empty spaces at the start or at the end those spaces should be trimmed (removed from the strings).
+
+### Usage
+
+Here is a possible `test.py` to test your functions:
+
+```python
+import punishment
+
+print(punishment.do_punishment('   The first half   ', '   and the second  ', 4), end='')
+print(punishment.do_punishment('Will not', 'show', 0), end='')
+print(punishment.do_punishment('', '', 3), end='')
+```
+
+```bash
+$ python test.py
+The first half and the second.
+The first half and the second.
+The first half and the second.
+The first half and the second.
+ .
+ .
+ .
+```
+
+### Hints
+
+- Removing spaces at the start and end of a string is so common that almost all languages implement this feature. Here you can check for the `strip()` method.
+- Instead of using loops you can try the `string multiplication` operator, which is a very nice feature of Python and will make your code more readable.
+
+### References
+
+* [strip](https://www.w3schools.com/python/ref_string_strip.asp)
+* [string multiplication](https://www.geeksforgeeks.org/create-multiple-copies-of-a-string-in-python-by-using-multiplication-operator/)