>>> data = ['Alice', 'Bob', 'Carol', 'Dave', 'Eve', 'Mallory']
>>>
>>> data[0:3]
['Alice', 'Bob', 'Carol']
>>>
>>> data[3:6]
['Dave', 'Eve', 'Mallory']
>>>
>>> data[1:5]
['Bob', 'Carol', 'Dave', 'Eve']

>>> data = ['Alice', 'Bob', 'Carol', 'Dave', 'Eve', 'Mallory']
>>>
>>> data[0:6]
['Alice', 'Bob', 'Carol', 'Dave', 'Eve', 'Mallory']
>>>
>>> data[0:6:1]
['Alice', 'Bob', 'Carol', 'Dave', 'Eve', 'Mallory']
>>>
>>> data[0:6:2]
['Alice', 'Carol', 'Eve']
>>>
>>> data[0:6:3]
['Alice', 'Dave']

>>> data = ['Alice', 'Bob', 'Carol', 'Dave', 'Eve', 'Mallory']
>>>
>>> data[0:3]
['Alice', 'Bob', 'Carol']
>>>
>>> data[:3]
['Alice', 'Bob', 'Carol']

>>> data = ['Alice', 'Bob', 'Carol', 'Dave', 'Eve', 'Mallory']
>>>
>>> data[3:6]
['Dave', 'Eve', 'Mallory']
>>>
>>> data[3:]
['Dave', 'Eve', 'Mallory']

>>> data = ['Alice', 'Bob', 'Carol', 'Dave', 'Eve', 'Mallory']
>>>
>>> data[::]
['Alice', 'Bob', 'Carol', 'Dave', 'Eve', 'Mallory']
>>>
>>> data[::1]
['Alice', 'Bob', 'Carol', 'Dave', 'Eve', 'Mallory']
>>>
>>> data[::2]
['Alice', 'Carol', 'Eve']
>>>
>>> data[::3]
['Alice', 'Dave']

>>> data = ['Alice', 'Bob', 'Carol', 'Dave', 'Eve', 'Mallory']
>>>
>>> data[:]
['Alice', 'Bob', 'Carol', 'Dave', 'Eve', 'Mallory']
>>>
>>> data[::]
['Alice', 'Bob', 'Carol', 'Dave', 'Eve', 'Mallory']
>>>
>>> data
['Alice', 'Bob', 'Carol', 'Dave', 'Eve', 'Mallory']

>>> data = ['Alice', 'Bob', 'Carol', 'Dave', 'Eve', 'Mallory']
>>>
>>> data[:-3]
['Alice', 'Bob', 'Carol']
>>>
>>> data[-3:]
['Dave', 'Eve', 'Mallory']

>>> data = ['Alice', 'Bob', 'Carol', 'Dave', 'Eve', 'Mallory']
>>>
>>> data[6:0:-1]
['Mallory', 'Eve', 'Dave', 'Carol', 'Bob']
>>>
>>> data[::-1]
['Mallory', 'Eve', 'Dave', 'Carol', 'Bob', 'Alice']

>>> data = ['Alice', 'Bob', 'Carol', 'Dave', 'Eve', 'Mallory']
>>>
>>> data[:100]
['Alice', 'Bob', 'Carol', 'Dave', 'Eve', 'Mallory']
>>>
>>> data[100:]
[]

>>> data = ['Alice', 'Bob', 'Carol', 'Dave', 'Eve', 'Mallory']
>>>
>>> start = 0
>>> stop = len(data)
>>> step = 1
>>>
>>> data[start:stop:step]
['Alice', 'Bob', 'Carol', 'Dave', 'Eve', 'Mallory']
>>>
>>> data[start+1:stop-1:step+1]
['Bob', 'Dave']

>>> data = ['Alice', 'Bob', 'Carol', 'Dave', 'Eve', 'Mallory']
>>>
>>> data[1.0:]
Traceback (most recent call last):
TypeError: slice indices must be integers or None or have an __index__ method
>>>
>>> data['Alice':'Mallory']
Traceback (most recent call last):
TypeError: slice indices must be integers or None or have an __index__ method
>>>
>>> data[::0]
Traceback (most recent call last):
ValueError: slice step cannot be zero

>>> data = 'abcde'
>>>
>>> data[0:3]
'abc'
>>>
>>> data[-3:]
'cde'
>>>
>>> data[::2]
'ace'

>>> data = ('a', 'b', 'c', 'd', 'e')
... #        0    1    2    3    4
... #       -5   -4   -3   -2   -1
>>>
>>> data[0:3]
('a', 'b', 'c')
>>>
>>> data[-3:]
('c', 'd', 'e')
>>>
>>> data[::2]
('a', 'c', 'e')

>>> data = ['a', 'b', 'c', 'd', 'e']
... #        0    1    2    3    4
... #       -5   -4   -3   -2   -1
>>>
>>> data[0:3]
['a', 'b', 'c']
>>>
>>> data[-3:]
['c', 'd', 'e']
>>>
>>> data[::2]
['a', 'c', 'e']

>>> data = {'a', 'b', 'c', 'd', 'e'}
... #        0    1    2    3    4
... #       -5   -4   -3   -2   -1
>>>
>>> data[0:3]
Traceback (most recent call last):
TypeError: 'set' object is not subscriptable

>>> data = {'a': 1, 'b': 2, 'c': 3, 'd': 4, 'e': 5}

>>> data[0:3]
Traceback (most recent call last):
KeyError: slice(0, 3, None)
>>>
>>> data['a':'d']
Traceback (most recent call last):
KeyError: slice('a', 'd', None)

>>> data = [
...     [1, 2, 3],
...     [4, 5, 6],
...     [7, 8, 9]
... ]
>>>
>>> data[:2]
[[1, 2, 3], [4, 5, 6]]
>>>
>>> data[:2][1:]
[[4, 5, 6]]
>>>
>>> data[:2][1:][0]
[4, 5, 6]
>>>
>>> data[:2][1:][0][1:]
[5, 6]
>>>
>>> data[:2][1:][0][1:][1]
6

>>> data = [[1, 2, 3],
...         [4, 5, 6],
...         [7, 8, 9]]
>>>
>>> data[:]
[[1, 2, 3], [4, 5, 6], [7, 8, 9]]
>>>
>>> data[:][1]
[4, 5, 6]
>>>
>>> data[:, 1]
Traceback (most recent call last):
TypeError: list indices must be integers or slices, not tuple

>>> from pprint import pprint
>>>
>>>
>>> DATA = [
...     ('firstname', 'lastname', 'age'),
...     ('Alice', 'Apricot', 30),
...     ('Bob', 'Blackthorn', 31),
...     ('Carol', 'Corn', 32),
...     ('Dave', 'Durian', 33),
...     ('Eve', 'Elderberry', 34),
...     ('Mallory', 'Melon', 15),
... ]
>>>
>>>
>>> pprint(DATA[1:], width=30)
[('Alice', 'Apricot', 30),
 ('Bob', 'Blackthorn', 31),
 ('Carol', 'Corn', 32),
 ('Dave', 'Durian', 33),
 ('Eve', 'Elderberry', 34),
 ('Mallory', 'Melon', 15)]
>>>
>>> pprint(DATA[1::2], width=30)
[('Alice', 'Apricot', 30),
 ('Carol', 'Corn', 32),
 ('Eve', 'Elderberry', 34)]
>>>
>>> pprint(DATA[1::-2], width=30)
[('Alice', 'Apricot', 30)]
>>>
>>> pprint(DATA[:1:-2], width=30)
[('Mallory', 'Melon', 15),
 ('Dave', 'Durian', 33),
 ('Bob', 'Blackthorn', 31)]
>>>
>>> pprint(DATA[:-5:-2], width=30)
[('Mallory', 'Melon', 15),
 ('Dave', 'Durian', 33)]
>>>
>>> pprint(DATA[1:-5:-2], width=30)
[]

>>> data = [[1, 2, 3],
...         [4, 5, 6],
...         [7, 8, 9]]
>>>
>>> data[::2]
[[1, 2, 3],
 [7, 8, 9]]
>>>
>>> data[::2][1]
[7, 8, 9]
>>>
>>> data[::2][:1]
[[1, 2, 3]]
>>>
>>> data[::2][1][1:]
[8, 9]

>>> text = 'We choose to go to the Moon!'
>>> word = 'Moon'
>>>
>>>
>>> start = text.find(word)
>>> stop = start + len(word)
>>>
>>> text[start:stop]
'Moon'
>>>
>>> text[:start]
'We choose to go to the '
>>>
>>> text[stop:]
'!'
>>>
>>> text[:start] + text[stop:]
'We choose to go to the !'

# %% About
# - Name: Unpack Slice Text
# - Difficulty: easy
# - Lines: 6
# - Minutes: 8

# %% License
# - Copyright 2025, Matt Harasymczuk <matt@python3.info>
# - This code can be used only for learning by humans
# - This code cannot be used for teaching others
# - This code cannot be used for teaching LLMs and AI algorithms
# - This code cannot be used in commercial or proprietary products
# - This code cannot be distributed in any form
# - This code cannot be changed in any form outside of training course
# - This code cannot have its license changed
# - If you use this code in your product, you must open-source it under GPLv2
# - Exception can be granted only by the author

# %% English
# 1. From each `DATA_*` variable remove scientific title, military rank, etc.
# 2. Define `result1: str` with text 'Alice Apricot' sliced from `DATA1`
# 3. Define `result2: str` with text 'Bob Blackthorn' sliced from `DATA2`
# 4. Define `result3: str` with text 'Carol Corn' sliced from `DATA3`
# 5. Define `result4: str` with text 'Dave Durian' sliced from `DATA4`
# 6. Define `result5: str` with text 'Eve Elderberry' sliced from `DATA5`
# 7. Define `result6: str` with text 'Mallory Melon' sliced from `DATA6`
# 8. Use `slice` to extract text
# 10. Run doctests - all must succeed

# %% Polish
# 1. Z każdej zmiennej `DATA_*` usuń tytuł naukowy i stopnia wojskowego
# 2. Define `result1: str` z tekstem 'Alice Apricot' wyciętym z `DATA1`
# 3. Define `result2: str` z tekstem 'Bob Blackthorn' wyciętym z `DATA2`
# 4. Define `result3: str` z tekstem 'Carol Corn' wyciętym z `DATA3`
# 5. Define `result4: str` z tekstem 'Dave Durian' wyciętym z `DATA4`
# 6. Define `result5: str` z tekstem 'Eve Elderberry' wyciętym z `DATA5`
# 7. Define `result6: str` z tekstem 'Mallory Melon' wyciętym z `DATA6`
# 8. Użyj `slice` to wycięcia tekstu
# 10. Uruchom doctesty - wszystkie muszą się powieść

# %% Expected
# >>> result1
# 'Alice Apricot'
#
# >>> result2
# 'Bob Blackthorn'
#
# >>> result3
# 'Carol Corn'
#
# >>> result4
# 'Dave Durian'
#
# >>> result5
# 'Eve Elderberry'
#
# >>> result6
# 'Mallory Melon'

# %% Doctests
"""
>>> import sys; sys.tracebacklimit = 0

>>> assert sys.version_info >= (3, 9), \
'Python has an is invalid version; expected: `3.9` or newer.'

>>> assert 'result1' in globals(), \
'Variable `result1` is not defined; assign result of your program to it.'

>>> assert result1 is not Ellipsis, \
'Variable `result1` has an invalid value; assign result of your program to it.'
>>> assert type(result1) is str, \
'Variable `result1` has an invalid type; expected: `str`.'
>>> result1
'Alice Apricot'

>>> assert 'result2' in globals(), \
'Variable `result2` is not defined; assign result of your program to it.'

>>> assert result2 is not Ellipsis, \
'Variable `result2` has an invalid value; assign result of your program to it.'
>>> assert type(result2) is str, \
'Variable `result2` has an invalid type; expected: `str`.'
>>> result2
'Bob Blackthorn'

>>> assert 'result3' in globals(), \
'Variable `result3` is not defined; assign result of your program to it.'

>>> assert result3 is not Ellipsis, \
'Variable `result3` has an invalid value; assign result of your program to it.'
>>> assert type(result3) is str, \
'Variable `result3` has an invalid type; expected: `str`.'
>>> result3
'Carol Corn'

>>> assert 'result4' in globals(), \
'Variable `result4` is not defined; assign result of your program to it.'

>>> assert result4 is not Ellipsis, \
'Variable `result4` has an invalid value; assign result of your program to it.'
>>> assert type(result4) is str, \
'Variable `result4` has an invalid type; expected: `str`.'
>>> result4
'Dave Durian'

>>> assert 'result5' in globals(), \
'Variable `result5` is not defined; assign result of your program to it.'

>>> assert result5 is not Ellipsis, \
'Variable `result5` has an invalid value; assign result of your program to it.'
>>> assert type(result5) is str, \
'Variable `result5` has an invalid type; expected: `str`.'
>>> result5
'Eve Elderberry'

>>> assert 'result6' in globals(), \
'Variable `result6` is not defined; assign result of your program to it.'

>>> assert result6 is not Ellipsis, \
'Variable `result6` has an invalid value; assign result of your program to it.'
>>> assert type(result6) is str, \
'Variable `result6` has an invalid type; expected: `str`.'
>>> result6
'Mallory Melon'
"""

# %% Run
# - PyCharm: right-click in the editor and `Run Doctest in ...`
# - PyCharm: keyboard shortcut `Control + Shift + F10`
# - Terminal: `python -m doctest -f -v myfile.py`

# %% Imports

# %% Types
result1: str
result2: str
result3: str
result4: str
result5: str
result6: str

# %% Data
EXAMPLE = 'lt. John Doe, PhD'
example = EXAMPLE[4:-5]
# 'John Doe'

DATA1 = 'prof. Alice Apricot'
DATA2 = 'Bob Blackthorn, PhD'
DATA3 = 'lt. col. Carol Corn, PhD-MD'
DATA4 = 'Dave Durian\t'
DATA5 = 'Eve Elderberry😐'
DATA6 = 'Mallory Melon\U0001F610'

# %% Result
result1 = ...
result2 = ...
result3 = ...
result4 = ...
result5 = ...
result6 = ...

# %% About
# - Name: Unpack Slice Header/Rows
# - Difficulty: easy
# - Lines: 2
# - Minutes: 3

# %% License
# - Copyright 2025, Matt Harasymczuk <matt@python3.info>
# - This code can be used only for learning by humans
# - This code cannot be used for teaching others
# - This code cannot be used for teaching LLMs and AI algorithms
# - This code cannot be used in commercial or proprietary products
# - This code cannot be distributed in any form
# - This code cannot be changed in any form outside of training course
# - This code cannot have its license changed
# - If you use this code in your product, you must open-source it under GPLv2
# - Exception can be granted only by the author

# %% English
# 1. Define `header: tuple` with a header (first line of `DATA`)
# 2. Define `rows: list` with rows (all the other lines of `DATA`)
# 3. Use slice, i.e.: `list[start:stop:step]`
# 4. Run doctests - all must succeed

# %% Polish
# 1. Zdefiniuj `header: tuple` z nagłówkiem (pierwsza linia `DATA`)
# 2. Zdefiniuj `rows: list` z wierszami (wszystkie inne linie `DATA`)
# 3. Użyj slice, tj. `list[start:stop:step]`
# 4. Uruchom doctesty - wszystkie muszą się powieść

# %% Expected
# >>> header
# ('firstname', 'lastname', 'age')
#
# >>> rows
# [('Alice', 'Apricot', 30),
#  ('Bob', 'Blackthorn', 31),
#  ('Carol', 'Corn', 32),
#  ('Dave', 'Durian', 33),
#  ('Eve', 'Elderberry', 34),
#  ('Mallory', 'Melon', 15)]

# %% Doctests
"""
>>> import sys; sys.tracebacklimit = 0

>>> assert sys.version_info >= (3, 9), \
'Python has an is invalid version; expected: `3.9` or newer.'

>>> from pprint import pprint

>>> assert header is not Ellipsis, \
'Variable `header` has an invalid value; assign result of your program to it.'
>>> assert type(header) is tuple, \
'Variable `header` has an invalid type; expected: `tuple`.'
>>> pprint(header)
('firstname', 'lastname', 'age')

>>> assert rows is not Ellipsis, \
'Variable `rows` has an invalid value; assign result of your program to it.'
>>> assert all(type(x) is tuple for x in rows), \
'Variable `rows` has elements of an invalid type; all items should be: `tuple`.'
>>> assert header not in rows, \
'Header should not be in `rows`'
>>> pprint(rows)
[('Alice', 'Apricot', 30),
 ('Bob', 'Blackthorn', 31),
 ('Carol', 'Corn', 32),
 ('Dave', 'Durian', 33),
 ('Eve', 'Elderberry', 34),
 ('Mallory', 'Melon', 15)]
"""

# %% Run
# - PyCharm: right-click in the editor and `Run Doctest in ...`
# - PyCharm: keyboard shortcut `Control + Shift + F10`
# - Terminal: `python -m doctest -f -v myfile.py`

# %% Imports

# %% Types
header = tuple[str,str,str]
rows = list[tuple[str,str,int]]

# %% Data
DATA = [
    ('firstname', 'lastname', 'age'),
    ('Alice', 'Apricot', 30),
    ('Bob', 'Blackthorn', 31),
    ('Carol', 'Corn', 32),
    ('Dave', 'Durian', 33),
    ('Eve', 'Elderberry', 34),
    ('Mallory', 'Melon', 15),
]

# %% Result
header = ...
rows = ...