Add all source code.

.gitignore

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+# Byte-compiled / optimized / DLL files
+__pycache__/
+*.py[cod]
+
+# C extensions
+*.so
+
+# Distribution / packaging
+.Python
+env/
+build/
+develop-eggs/
+dist/
+downloads/
+eggs/
+.eggs/
+#lib/
+#lib64/
+parts/
+sdist/
+var/
+*.egg-info/
+.installed.cfg
+*.egg
+
+# PyInstaller
+#  Usually these files are written by a python script from a template
+#  before PyInstaller builds the exe, so as to inject date/other infos into it.
+*.manifest
+*.spec
+
+# Installer logs
+pip-log.txt
+pip-delete-this-directory.txt
+
+# Unit test / coverage reports
+htmlcov/
+.tox/
+.coverage
+.coverage.*
+.cache
+nosetests.xml
+coverage.xml
+*,cover
+
+# Translations
+*.mo
+*.pot
+
+# Django stuff:
+*.log
+
+# Sphinx documentation
+docs/_build/
+
+# PyBuilder
+target/
+

README.rst

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+=========================================
+Learning Python Programming - Source Code
+=========================================
+
+This project holds the source code for the book:
+
+**Learn Python Programming, 2nd Edition - Packt Publishing**
+
+Author: **Fabrizio Romano**
+
+ISBN: **9781788996662**
+
+Publication date: **June 2018**
+
+
+Setup
+=====
+
+Create a virtual environment with a Python version 3.7.*.
+
+
+Installing requirements
+-----------------------
+
+Install all the requirements text files via pip like this:
+
+    $ pip install -r requirements.txt
+
+Requirements for the data science chapter can be cumbersome to install
+so I kept them separated, in the `requirements.data.science.txt` file.
+
+If you wish to install all requirements at once, just execute the following:
+
+    $ pip install -r all.txt
+
+
+Updating requirements
+---------------------
+
+To update requirements you can use `pip-tools` to compile the `*.in`
+sources in the `requirements` folder.
+
+To compile and update a single `.in` file, run the following:
+
+    $ pip-compile -U requirements.in
+
+If you want to compile all requirements into one single `.txt` file,
+run the following:
+
+    $ pip-compile -U -o all.txt *.in
+
+This will read all the `.in` files and compile them together into the
+`all.txt` file.
+
+
+Python Version
+==============
+
+Python 3.7
+
+
+Last update
+-----------
+
+2018.06.29

ch1/bike.py

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+# let's define the class Bike
+class Bike:
+
+    def __init__(self, colour, frame_material):
+        self.colour = colour
+        self.frame_material = frame_material
+
+    def brake(self):
+        print("Braking!")
+
+# let's create a couple of instances
+red_bike = Bike('Red', 'Carbon fiber')
+blue_bike = Bike('Blue', 'Steel')
+
+# let's inspect the objects we have, instances of the Bike class.
+print(red_bike.colour)  # prints: Red
+print(red_bike.frame_material)  # prints: Carbon fiber
+print(blue_bike.colour)  # prints: Blue
+print(blue_bike.frame_material)  # prints: Steel
+
+# let's brake!
+red_bike.brake()  # prints: Braking!

ch1/factorial.py

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+>>> from math import factorial
+>>> factorial(5)
+120

ch1/names.py

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+>>> n = 3  # integer number
+>>> address = "221b Baker Street, NW1 6XE, London"  # Sherlock Holmes' address
+>>> employee = {
+...     'age': 45,
+...     'role': 'CTO',
+...     'SSN': 'AB1234567',
+... }
+>>> # let's print them
+>>> n
+3
+>>> address
+'221b Baker Street, NW1 6XE, London'
+>>> employee
+{'age': 45, 'role': 'CTO', 'SSN': 'AB1234567'}
+>>> other_name
+Traceback (most recent call last):
+  File "<stdin>", line 1, in <module>
+NameError: name 'other_name' is not defined
+>>>

ch1/scopes1.py

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+# Local versus Global
+
+# we define a function, called local
+def local():
+    m = 7
+    print(m)
+
+m = 5
+print(m)
+
+# we call, or `execute` the function local
+local()

ch1/scopes2.py

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+# Local versus Global
+
+def local():
+    # m doesn't belong to the scope defined by the local function
+    # so Python will keep looking into the next enclosing scope.
+    # m is finally found in the global scope
+    print(m, 'printing from the local scope')
+
+m = 5
+print(m, 'printing from the global scope')
+
+local()

ch1/scopes3.py

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+# Local, Enclosing and Global
+
+
+def enclosing_func():
+    m = 13
+
+    def local():
+        # m doesn't belong to the scope defined by the local
+        # function so Python will keep looking into the next
+        # enclosing scope. This time m is found in the enclosing
+        # scope
+        print(m, 'printing from the local scope')
+
+    # calling the function local
+    local()
+
+m = 5
+print(m, 'printing from the global scope')
+
+enclosing_func()

ch1/virtualenv.creation.txt

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+fabmp:srv fab$ # step 1 - create folder
+fabmp:srv fab$ mkdir learn.pp
+fabmp:srv fab$ cd learn.pp
+
+fabmp:learn.pp fab$ # step 2 - create virtual environment
+fabmp:learn.pp fab$ which python3.7
+/Users/fab/.pyenv/shims/python3.7
+fabmp:learn.pp fab$ virtualenv -p
+⇢ /Users/fab/.pyenv/shims/python3.7 learnpp
+Running virtualenv with interpreter /Users/fab/.pyenv/shims/python3.7
+Using base prefix '/Users/fab/.pyenv/versions/3.7.0a3'
+New python executable in /Users/fab/srv/learn.pp/learnpp/bin/python3.7
+Also creating executable in /Users/fab/srv/learn.pp/learnpp/bin/python
+Installing setuptools, pip, wheel...done.
+
+fabmp:learn.pp fab$ # step 3 - activate virtual environment
+fabmp:learn.pp fab$ source learnpp/bin/activate
+
+(learnpp) fabmp:learn.pp fab$ # step 4 - verify which python
+(learnpp) fabmp:learn.pp fab$ which python
+/Users/fab/srv/learn.pp/learnpp/bin/python
+
+(learnpp) fabmp:learn.pp fab$ python
+Python 3.7.0a3 (default, Jan 27 2018, 00:46:45)
+[Clang 9.0.0 (clang-900.0.39.2)] on darwin
+Type "help", "copyright", "credits" or "license" for more information.
+>>> exit()
+
+(learnpp) fabmp:learn.pp fab$ # step 5 - deactivate
+(learnpp) fabmp:learn.pp fab$ deactivate
+fabmp:learn.pp fab$

ch10/aio/randompix_corout.py

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+import os
+from secrets import token_hex
+import asyncio
+
+import aiohttp
+
+
+PICS_FOLDER = 'pics'
+URL = 'http://lorempixel.com/640/480/'
+# URL = 'https://lorempizza.com/640/480/'
+
+
+async def download_image(url):
+    async with aiohttp.ClientSession() as session:
+        async with session.get(url) as resp:
+            return await resp.read()
+
+
+async def download(url, semaphore):
+    async with semaphore:
+        content = await download_image(url)
+    filename = save_image(content)
+    return filename
+
+
+def save_image(content):
+    filename = '{}.jpg'.format(token_hex(4))
+    path = os.path.join(PICS_FOLDER, filename)
+    with open(path, 'wb') as stream:
+        stream.write(content)
+    return filename
+
+
+def batch_download(images, url):
+    loop = asyncio.get_event_loop()
+    semaphore = asyncio.Semaphore(10)
+    cors = [download(url, semaphore) for _ in range(images)]
+    res, _ = loop.run_until_complete(asyncio.wait(cors))
+    loop.close()
+    return [r.result() for r in res]
+
+
+if __name__ == '__main__':
+    saved = batch_download(20, URL)
+    print(saved)

ch10/aio/randompix_proc.py

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+import os
+from secrets import token_hex
+from concurrent.futures import ProcessPoolExecutor, as_completed
+
+import requests
+
+
+PICS_FOLDER = 'pics'
+URL = 'http://lorempixel.com/640/480/'
+# URL = 'https://lorempizza.com/640/480/'
+
+
+def download(url):
+    resp = requests.get(URL)
+    return save_image(resp.content)
+
+
+def save_image(content):
+    filename = '{}.jpg'.format(token_hex(4))
+    path = os.path.join(PICS_FOLDER, filename)
+    with open(path, 'wb') as stream:
+        stream.write(content)
+    return filename
+
+
+def batch_download(url, n, workers=4):
+    with ProcessPoolExecutor(max_workers=workers) as executor:
+        futures = (executor.submit(download, url) for _ in range(n))
+        return [future.result() for future in as_completed(futures)]
+
+
+if __name__ == '__main__':
+    saved = batch_download(URL, 10)
+    print(saved)

ch10/aio/randompix_serial.py

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+import os
+from secrets import token_hex
+
+import requests
+
+
+PICS_FOLDER = 'pics'
+URL = 'http://lorempixel.com/640/480/'
+# URL = 'https://lorempizza.com/640/480/'
+
+
+def download(url):
+    resp = requests.get(URL)
+    return save_image(resp.content)
+
+
+def save_image(content):
+    filename = '{}.jpg'.format(token_hex(4))
+    path = os.path.join(PICS_FOLDER, filename)
+    with open(path, 'wb') as stream:
+        stream.write(content)
+    return filename
+
+
+def batch_download(url, n):
+    return [download(url) for _ in range(n)]
+
+
+if __name__ == '__main__':
+    saved = batch_download(URL, 10)
+    print(saved)