Keywords

• $?
  • • Testing demo: doctest
• %ERRORLEVEL%
  • • Testing demo: doctest
• %s
  • • Select some data WHERE clause
• *
  • • Variable length argument list with * and
• • • Variable length argument list with * and
• kwargs
  • • Arbitrary key-value pairs in parameters **
    • Extra key-value pairs in parameters
    • Variable length argument list with * and **
• *args
  • • Variable length argument list with * and **
• --check-untyped-def
  • • Type in unannotated function
    • Type in unannotated function
• --strict
  • • Type in unannotated function
    • Type in unannotated function
• .pth
  • • path to load modules from - The module search path
• 2to3
  • • Convertig from Python 2 to Python 3
• ?|sqlite
  • • INSERT data into SQLite database
• @
  • • Decorator
• __all__
  • • Export import
    • Export import with __all__
• __class__
  • • Getting the class name of an object
• __delete__
  • • Python Descriptors
• __enter__
  • • Context manager with class
    • Context managers with class
• __exit__
  • • Context manager with class
    • Context managers with class
• __file__
  • • Relative path
    • Pathlib current file
    • mycalc as a self testing module
• __get__
  • • Python Descriptors
• __import__
  • • import hooks
• __init__
  • • Pass parameters to threads - Counter with attributes
    • Python Descriptors
• __init__.py
  • • Create package
    • package importing (and exporting) module
• __main__
  • • Script or library
• __name__
  • • Script or library
    • type
    • Getting the class name of an object
• __pycache__
  • • Python modules are compiled
• __set__
  • • Python Descriptors
• *args
  • • Arbitrary number of arguments *
• abc
  • • Abstract Class
• abspath
  • • Relative path
    • OS path
• acquire
  • • Lock - acquire - release
    • Multitasking counter with thread locking
• active
  • • Create an Excel file from scratch
• ADAPTIVE_THRESH_GAUSSIAN_C
  • • OpenCV - Adaptive Thresholding
• ADAPTIVE_THRESH_MEAN_C
  • • OpenCV - Adaptive Thresholding
• adaptiveThreshold
  • • OpenCV - Adaptive Thresholding
• add_cascade
  • • Python Tk Menubar
• add_command
  • • Python Tk Menubar
• after
  • • Python Tk Timer event (after)
• append
  • • Append to file
• argparse
  • • Modules to handle the command line
• argv
  • • sys module
• askopenfile
  • • Python Tk Filedialog
• askopenfilename
  • • Simple file dialog
    • Python Tk Filedialog
• asksaveasfile
  • • Python Tk Filedialog
• asksaveasfilename
  • • Python Tk Filedialog
• assert
  • • Testing demo: pytest using classes
    • assert to verify values
• assertEqual
  • • Testing demo: Unittest success
• async
  • • Print async
    • Async chores
• asyncio
  • • Print async
• AUTOINCREMENT
  • • SQLite in-memory AUTOINCREMENT
• await
  • • Print async
    • Async chores
• basename
  • • OS path
    • Pathlib parts (basename)
• basicConfig
  • • Simple logging
• BeautifulSoup
  • • Beautiful Soup to parse HTML
• begin
  • • SQLAlchemy autocommit
• bgcolor
  • • Turtle screen
• bilateralFilter
  • • OpenCV Bilateral blur
• bind
  • • Python Tk Keybinding
    • Python Tk Combobox
• bisect
  • • Insert element in sorted list using bisect
• bitwise_and
  • • OpenCV - bitwise operations
• bitwise_not
  • • OpenCV - bitwise operations
• bitwise_or
  • • OpenCV - bitwise operations
• bitwise_xor
  • • OpenCV - bitwise operations
• blur
  • • OpenCV blur image
• bool
  • • Built-in types
    • Built-in types
• BooleanVar
  • • Python Tk Checkbox
• break
  • • Exit vs return vs break and continue
• bs4
  • • Beautiful Soup to parse HTML
• Button
  • • Python Tk Button
    • Python Tk echo - change text of label
    • Tk: Runner
    • Tk: Old Quit button
    • Solution: Tk - Calculator with buttons
• cache
  • • Decorators caching - with cache
• calcHist
  • • OpenCV - grayscale historgrams
    • OpenCV - color historgrams
• call
  • • External CLI tool to demo subprocess
• canny
  • • OpenCV - Canny Dilate Erode
• CascadeClassifier
  • • OpenCV - Face detection
• CGI
  • • Hello world web
• chdir
  • • Current directory (getcwd, pwd, chdir)
    • cd in a function
• Checkbox
  • • Python Tk Checkbox
• Checkbutton
  • • Tk: Old Checkbox
• chomp
  • • Read file remove newlines
• circle
  • • Circle
    • OpenCV - draw circle
• classmethod
  • • Use cases for decorators in Python
• close
  • • Open and read file using with (recommended)
    • Filehandle using with and not using it
    • Connect to MySQL
    • SQLAlchemy engine SELECT
• closure
  • • Make incrementor with def (closure)
• collections
  • • Change order of keys in dictionary - OrderedDict
    • Set order of keys in dictionary - OrderedDict
    • Default Dict
    • Solution: count characters with default dict
    • Set order of keys in JSON - OrderedDict
    • Counting words - which implementation is faster?
• color
  • • Python Tk Label - font size and color
    • Create First Image
• COLOR_BGR2GRAY
  • • OpenCV convert BGR to greyscale and back to BGR
• COLOR_BGR2HSV
  • • OpenCV - BGR to HSV
• COLOR_BGR2LAB
  • • OpenCV - BGR to LAB
• COLOR_BGR2RGB
  • • OpenCV - BGR to RGB
• COLOR_GRAY2BGR
  • • OpenCV convert BGR to greyscale and back to BGR
• COLOR_HSV2BGR
  • • OpenCV - BGR to HSV
• COLOR_LAB2BGR
  • • OpenCV - BGR to LAB
• COLOR_RGB2BGR
  • • OpenCV - BGR to RGB
• colorama
  • • Print in color on the CLI
• column_dimensions
  • • Create an Excel file from scratch
• Combobox
  • • Python Tk Combobox
• ComboboxSelected
  • • Python Tk Combobox
• commit
  • • Insert data
    • SQLAlchemy autocommit
• commit|sqlite
  • • Create TABLE in SQLite
• config
  • • Python Tk Label - font size and color
• connect
  • • Connect to MySQL
• connect|sqlite
  • • Connecting to SQLite database
• const
  • • Argparse argument with default and optional value
• contextlib
  • • tempdir context manager
• contextmanager
  • • tempdir context manager
• continue
  • • Exit vs return vs break and continue
• copy
  • • shutil module
• copytree
  • • shutil module
• Counter
  • • Solution: count words (Counter)
    • Counting words - which implementation is faster?
• COUNT|sqlite
  • • SELECT aggregate data from SQLite database
• cp
  • • shutil module
• cProfile
  • • cProfile slow code
• cpu_count
  • • Multiprocess CPU count
• create_engine
  • • SQLAlchemy engine
• create_sheet
  • • Worksheets in Excel
• create_task
  • • Async sleep in loop
• CREATE|sqlite
  • • Create TABLE in SQLite
• csc
  • • Use .NET libraries from Python
• csv
  • • Reading a CSV file
• ctypes
  • • ctypes - hello
    • Tk: Runner with threads
• currentframe
  • • Name of the current function in Python
• curselection
  • • Python Tk Listbox
• cursor
  • • Select data
    • GitHub GraphSQL paging using cursor
• cursor|sqlite
  • • Connecting to SQLite database
• cwd
  • • Pathlib cwd
• cx_Freeze
  • • Packaging applications (creating executable binaries)
• date
  • • date fromisoformat (only date, no time)
    • Convert datetime object to date object
    • Today (date)
• datetime
  • • Current date and time datetime now
    • Convert datetime object to date object
• daylight
  • • time module
• def
  • • Defining simple function
    • Passing positional parameters to a function
• DEFAULT
  • • SQLite in-memory field with DEFAULT value
• defaultdict
  • • Default Dict
    • Solution: count characters with default dict
    • Solution: count words (defaultdict)
    • Counting words - which implementation is faster?
• del
  • • Delete key
• DELETE
  • • Delete data
• delete
  • • Solution: Tk - Calculator one line
• detectMultiScale
  • • OpenCV - Face detection
• dict
  • • Dictionary
    • Built-in types
    • Built-in types
• Dict
  • • Complex types for Python 3.8 and before
    • Complex types for Python 3.8 and before
• dictionary
  • • Dictionary
• DictReader
  • • CSV to dictionary
• dilate
  • • OpenCV - Canny Dilate Erode
• dir
  • • Directory listing
• dir()
  • • Getting help
• dirname
  • • Relative path
    • OS path
    • Pathlib parents (dirname)
• discover
  • • Add tests
• division
  • • division
• do while
  • • do while
• doctest
  • • Testing demo: doctest
    • doctest
• dump
  • • dump
    • Write YAML
• Dumper
  • • Write YAML
• dumps
  • • JSON dumps
    • Round trip
• easy_install
  • • Install Package
• else
  • • Exceptions else
• END
  • • Python Tk Listbox
• Engine
  • • SQLAlchemy engine CREATE TABLE
• Entry
  • • Python Tk echo - change text of label
    • Python Tk Entry (one-line text entry)
    • Tk: Old File selector
    • Solution: Tk - Calculator one line
• enumerate
  • • enumerate
• erode
  • • OpenCV - Canny Dilate Erode
• except
  • • Open file exception handling
    • Catch ZeroDivisionError exception
    • Handle divide by zero exception
    • Catching exceptions
    • Counting words - which implementation is faster?
• Exception
  • • Catch all the exceptions and show their type
    • How to raise an exception
    • assert to verify values
• executable
  • • sys module
    • Using Modules
• execute
  • • External CLI tool to demo subprocess
    • Select data
    • SQLAlchemy engine CREATE TABLE
• execute|sqlite
  • • Create TABLE in SQLite
• exists
  • • Does the key exist?
    • OS path
    • Pathlib exists
• exit
  • • Exit vs return vs break and continue
• exitonclick
  • • Line
• expanduser
  • • expanduser - handle tilde ~ the home directory of the user
• fetchall
  • • Select all data fetchall
• fetchmany
  • • Select some data fetchmany
• fetchone
  • • Select data
    • SQLAlchemy engine SELECT
• fetchone|sqlite
  • • SELECT aggregate data from SQLite database
• filedialog
  • • Simple file dialog
    • Python Tk Filedialog
    • Tk: Old File selector
• FileHandler
  • • getLogger
• FileNotFoundError
  • • Handle files - exception
• finally
  • • Exceptions finally
    • Exit and finally
    • Catching exceptions
• flake8
  • • F811 - redefinition of unused
• float
  • • REPL - Read Evaluate Print Loop
    • Built-in types
    • Built-in types
• font
  • • Python Tk Label - font size and color
• for
  • • for loop or reduce to add numbers?
• fork
  • • Fork
    • Forking
• format_stack
  • • No need for exception to print Stack trace
• forward
  • • Line
    • Square (forward, left)
    • Turtle house
• Frame
  • • Python Tk Frame
    • Tk: Old Simple Tk app with class
• Freeze
  • • Packaging applications (creating executable binaries)
• from
  • • Raise Exception from
    • Export import
• fromisoformat
  • • datetime fromisoformat
    • date fromisoformat (only date, no time)
• functools
  • • for loop or reduce to add numbers?
• gather
  • • Print async
    • Async sleep in loop with gather
• GaussianBlur
  • • OpenCV Gaussian blur
• get
  • • Get key
    • Python Tk Listbox
• getcwd
  • • Current directory (getcwd, pwd, chdir)
    • cd in a function
• getlocale
  • • get and set locale
• getLogger
  • • getLogger
• getpid
  • • Get process ID
    • Fork
• getppid
  • • Get process ID
    • Fork
• getscreen
  • • Turtle screen
• getturtle
  • • Line
• glob
  • • Directory listing using glob
• glob.glob
  • • Directory listing using glob
• global
  • • Counter with global
• gmtime
  • • time module
• goto
  • • Move turtle without drawing (penup, pendown, goto)
    • Turtle house
• GTK
  • • GUI Toolkits
• GUI
  • • GUI Toolkits
• help()
  • • Getting help
• HORIZONTAL
  • • Python Tk Scale
• hour
  • • Rounding datetime object to date (removing hours, minutes, seconds)
• IDLE
  • • IDLE - Integrated DeveLopment Environment
• Image
  • • Create First Image
• imap
  • • Multiprocess load async
• imp.reload
  • • Modules: more
• import
  • • How "import" and "from" work?
    • Using Modules
    • Getting help
    • Export import
• imread
  • • OpenCV Read image
• imshow
  • • OpenCV Read image
• imwrite
  • • OpenCV crop, resize and save image
• in
  • • Does the key exist?
• input
  • • input and raw_input
• INSERT
  • • Insert data
    • SQLAlchemy engine INSERT
• insert
  • • Python MongoDB insert
    • Solution: Tk - Calculator one line
• insert_one
  • • Python MongoDB insert
• INSERT|sqlite
  • • INSERT data into SQLite database
• insort
  • • Insert element in sorted list using insort
• inspect
  • • Name of the current function in Python
    • Name of the caller function in Python
    • Stack trace in Python using inspect
• int
  • • REPL - Read Evaluate Print Loop
    • Built-in types
    • Built-in types
• INTER_AREA
  • • OpenCV resize (rescale) images
• intersection
  • • set operations
    • set intersection
• IOError
  • • Not existing file
• ipywidgets
  • • IPy Widgets
• iris
  • • Kaggle - Iris
    • Multi-feature Classification (Iris)
• issubset
  • • set operations
    • set subset
• items
  • • Loop using items
• iter
  • • itertools - pairwise
• iterdir
  • • Pathlib iterdir (flat)
• izip
  • • itertools - izip
    • mixing iterators
    • itertools - pairwise
• java
  • • Jython Installation
• join
  • • os.path.join
• json
  • • JSON - JavaScript Object Notation
• jython
  • • Jython Installation
• key
  • • Sort dictionary keys by value (another example)
• keys
  • • keys
    • Loop over keys
• keyword argument
  • • Function parameters can be named
• kill
  • • Signals and Python
    • Sending Signal
• Label
  • • Python Tk Label
    • Python Tk echo - change text of label
    • Tk: Old Hello World
• Laplacian
  • • OpenCV - Laplacian Gradients
• LC_CTYPE
  • • get and set locale
• left
  • • Square (forward, left)
• len
  • • The Python interactive shell
• lint
  • • Static Code Analyzis - Linters
• list
  • • Built-in types
    • Built-in types
• List
  • • Complex types for Python 3.8 and before
    • Complex types for Python 3.8 and before
• list_dialects
  • • CSV dialects
• Listbox
  • • Python Tk Listbox
• listdir
  • • Directory listing
• load
  • • load
    • Read YAML
• Loader
  • • Read YAML
• loads
  • • JSON loads
    • Round trip
• locale
  • • get and set locale
• Lock
  • • Lock - acquire - release
    • Multitasking counter with thread locking
• logging
  • • Simple logging
    • Multiprocess and logging
• lru_cache
  • • Decorators caching - with cache
• mainloop
  • • Python Tk Label
    • Tk: Old Simple Tk app with class
• makedir
  • • Pathlib mkdir (makedir)
• makedirs
  • • OS dir (mkdir, makedirs, remove, rmdir)
• map
  • • Multiprocess N files: Pool
    • Multiprocess load
    • Multiprocess: Pool
• map_async
  • • Multiprocess load async
• medianBlur
  • • OpenCV Median blur
• memory
  • • SQLite in-memory AUTOINCREMENT
    • SQLite in-memory field with DEFAULT value
• Menu
  • • Python Tk Menubar
• merge
  • • OpenCV - Split and merge color channels
• microsecond
  • • Rounding datetime object to nearest second (removing microseconds)
    • Rounding datetime object to date (removing hours, minutes, seconds)
• microseconds
  • • Rounding datetime object to nearest second (removing microseconds)
• minute
  • • Rounding datetime object to date (removing hours, minutes, seconds)
• mkdir
  • • OS dir (mkdir, makedirs, remove, rmdir)
    • Pathlib mkdir (makedir)
• mkdtemp
  • • tempdir context manager
• MongoClient
  • • Python MongoDB insert
• move
  • • shutil module
• MULTIPLE
  • • Python Tk Listbox Multiple
• multiprocess
  • • Multiprocess N files: Pool
    • Multiprocess load
    • Multiprocess: Pool
    • Multiprocess and logging
• multitasking
  • • Multitasking example
• mypy
  • • mypy
• named parameter
  • • Function parameters can be named
• namedtuple
  • • Named tuple (sort of immutable dictionary)
• nargs
  • • Argparse argument with default and optional value
• nbconvert
  • • Jupyter Notebook convert to other format (nbconvert)
• non-keyword arg after keyword arg
  • • Several defaults, using names
• None
  • • Raise Exception from
• nonlocal
  • • Counter closure
• now
  • • Current date and time datetime now
    • Convert datetime object to date object
• nuget
  • • Use .NET libraries from Python
• open
  • • Open and read file using with (recommended)
    • Writing to file
    • Print to file
    • Filehandle using with and not using it
• Optional
  • • Optional type (variable can also be None)
    • Optional type (variable can also be None)
• OptionMenu
  • • Python Tk OptionMenu
• OrderedDict
  • • Change order of keys in dictionary - OrderedDict
    • Set order of keys in dictionary - OrderedDict
    • Set order of keys in JSON - OrderedDict
• os
  • • python which OS are we running on (os, platform)
• os.environ
  • • Accessing the system environment variables from Python
• os.listdir
  • • Directory listing
• os.path.exists
  • • Does file exist? Is it a file?
• os.path.expanduser
  • • expanduser - handle tilde ~ the home directory of the user
• os.path.isdir
  • • Does file exist? Is it a file?
• os.path.isfile
  • • Does file exist? Is it a file?
• os.path.join
  • • os.path.join
• os.remove
  • • Remove file
• os.stat
  • • open in for loop
• os.system
  • • External command with system
• os.unlink
  • • Remove file
• os.walk
  • • Traverse directory tree - list directories recursively
• pack
  • • Python Tk Label
    • Python Tk Frame
• parent
  • • Pathlib parents (dirname)
• partial
  • • Functool - partial
• parts
  • • Pathlib parts (basename)
• patents
  • • Pathlib parents (dirname)
• path
  • • sys.path - the module search path
    • sys module
    • OS path
    • Directory listing
• Path
  • • Pathlib example
• pdb
  • • pdb = Python Debugger
• pendown
  • • Move turtle without drawing (penup, pendown, goto)
• penup
  • • Move turtle without drawing (penup, pendown, goto)
• pep8
  • • PEP8
• PIL
  • • Install Pillow
• Pillow
  • • Install Pillow
• pip
  • • pip
    • Install Package
• platform
  • • python which OS are we running on (os, platform)
• Pool
  • • Multiprocess N files: Pool
    • Multiprocess load
    • Multiprocess: Pool
• pop
  • • Delete key
• POST
  • • requests post
• print
  • • Print to file
    • print in Python 3
• print_help
  • • argparse print help explicitely
• profile
  • • profile slow code
• Progreessbar
  • • Python Tk Progressbar
• pwd
  • • Current directory (getcwd, pwd, chdir)
• py2app
  • • Packaging applications (creating executable binaries)
• py2exe
  • • Packaging applications (creating executable binaries)
• pyc
  • • Python modules are compiled
• PyInstaller
  • • Packaging applications (creating executable binaries)
• pylint
  • • Warn when Redefining functions
• pytest
  • • Testing demo: pytest using classes
    • Use cases for decorators in Python
• pythonnet
  • • Use .NET libraries from Python
• PYTHONPATH
  • • path to load modules from - The module search path
• Qt
  • • GUI Toolkits
• queue
  • • Tk: Runner with threads
• Queue
  • • Create a counter queue
• Radiobutton
  • • Python Tk Radiobutton
• raise
  • • How to raise an exception
    • Raise Exception from
    • assert to verify values
• range
  • • range vs xrange in Python
• raw_input
  • • input and raw_input
• rb
  • • Binary mode
• read
  • • Read all the characters into a string (slurp)
• reader
  • • Reading a CSV file
• readlines
  • • Read all the lines into a list
• rectangle
  • • OpenCV - draw rectangle
• reduce
  • • for loop or reduce to add numbers?
• release
  • • Lock - acquire - release
    • Multitasking counter with thread locking
• reload
  • • Modules: more
• remove
  • • OS dir (mkdir, makedirs, remove, rmdir)
• removedirs
  • • OS dir (mkdir, makedirs, remove, rmdir)
• REPL
  • • REPL - Read Evaluate Print Loop
• requests
  • • get HTML page using requests
    • requests change header
    • requests post
• resize
  • • OpenCV resize (rescale) images
• return
  • • Defining simple function
    • Exit vs return vs break and continue
• right
  • • Turtle house
• rmdir
  • • OS dir (mkdir, makedirs, remove, rmdir)
• rmtree
  • • OS dir (mkdir, makedirs, remove, rmdir)
    • shutil module
• rollback
  • • SQLAlchemy autocommit
• Roslyn
  • • Use .NET libraries from Python
• rot13
  • • Exercise: ROT13
    • Solution: ROT13
• rstrip
  • • Read file remove newlines
• run
  • • Threaded counters
    • Simple threaded counters
• save
  • • Create an Excel file from scratch
• Scale
  • • Python Tk Scale
• scope
  • • Variable scope
• second
  • • Rounding datetime object to date (removing hours, minutes, seconds)
• SELECT
  • • SQLAlchemy engine SELECT
• selectmode
  • • Python Tk Listbox Multiple
• SELECT|sqlite
  • • SELECT data from SQLite database
    • SELECT aggregate data from SQLite database
• set
  • • sets
    • set operations
    • set intersection
    • set subset
    • set symmetric difference
    • set union
    • Built-in types
    • Built-in types
• Set
  • • Complex types for Python 3.8 and before
    • Complex types for Python 3.8 and before
• set_max_threads
  • • Multitasking example
• setlocale
  • • get and set locale
• shape
  • • OpenCV resize (rescale) images
• shutil
  • • OS dir (mkdir, makedirs, remove, rmdir)
    • shutil module
• side
  • • Python Tk Frame
• size
  • • Create First Image
• sleep
  • • sleep in Python
• Sobel
  • • OpenCV - Sobel Gradients
• sort
  • • Sort dictionary keys by value (another example)
• split
  • • Reading CSV the naive way
    • OpenCV - Split and merge color channels
    • Optional type (variable can also be None)
    • Optional type (variable can also be None)
• sqlite
  • • SQLite
• stack
  • • Name of the current function in Python
    • Name of the caller function in Python
    • Stack trace in Python using inspect
• stat
  • • open in for loop
• static
  • • Static variable
• staticmethod
  • • Use cases for decorators in Python
• stderr
  • • Writing to standard error (stderr)
• stdout
  • • Writing to standard error (stderr)
• steps
  • • Square using the circle command
• str
  • • Built-in types
    • Built-in types
• StreamHandler
  • • getLogger
• strftime
  • • time module
    • Current date and time datetime now
• StringVar
  • • Python Tk OptionMenu
• strptime
  • • Converting string to datetime (parsing date and time string)
    • Parse datetime string with and without timezone information
    • datetime arithmeticis (subtract)
• subprocess
  • • External CLI tool to demo subprocess
• suffix
  • • Pathlib get extension (suffix)
• SUM|sqlite
  • • SELECT aggregate data from SQLite database
• symmetric_difference
  • • set operations
    • set symmetric difference
• sys
  • • sys.path - the module search path
    • sys module
    • Using Modules
• sys.modules
  • • Modules: more
• sys.path
  • • Relative path
• system
  • • External command with system
• task
  • • Multitasking example
• TBD
  • • SQLite transactions
• tempfile
  • • tempdir context manager
• TestCase
  • • Testing demo: Unittest success
• Text
  • • Python Tk Text
    • Tk: Runner
• Thread
  • • Threaded counters
    • Simple threaded counters
    • Pass parameters to threads - Counter with attributes
• threading
  • • Threaded counters
    • Simple threaded counters
    • Pass parameters to threads - Counter with attributes
    • Multitasking counter with thread locking
    • Tk: Runner with threads
• THRESH_BINARY
  • • OpenCV - Simple Thresholding
• THRESH_BINARY_INV
  • • OpenCV - Simple Thresholding
• threshold
  • • OpenCV - Simple Thresholding
• thresholding
  • • OpenCV - Thresholding
• throw
  • • How to raise an exception
• time
  • • time module
    • Convert datetime object to time object
    • Fork load results
• timedelta
  • • datetime arithmeticis (subtract)
• TimedRotatingFileHandler
  • • Time-based logrotation
• timeit
  • • Counting words - which implementation is faster?
• timezone
  • • time module
• Tk
  • • GUI Toolkits
    • Python Tk Label
    • Tk: Old Simple Tk app with class
    • Tk: Old Getting started with Tk
• tkinter
  • • Python Tk Label
    • Tk: Old Simple Tk app with class
• today
  • • Today (date)
• total_seconds
  • • datetime arithmeticis (subtract)
• traceback
  • • No need for exception to print Stack trace
• train_test_split
  • • Split data set
• trim
  • • Read file remove newlines
• try
  • • Open file exception handling
    • Handle divide by zero exception
    • Catching exceptions
    • Counting words - which implementation is faster?
• tuple
  • • Solution: Combine lists with tuple
    • Arbitrary number of arguments *
    • Built-in types
    • Built-in types
• Tuple
  • • Complex types for Python 3.8 and before
    • Complex types for Python 3.8 and before
• type
  • • type
    • Getting the class name of an object
• tzinfo
  • • Parse datetime string with and without timezone information
    • Timezone aware datetime
• union
  • • set union
• Union
  • • Either this or that type (Union)
    • Either this or that type for Python before 3.10
    • Either this or that type (Union)
    • Either this or that type for Python before 3.10
• unittest
  • • Testing demo: Unittest success
    • Add tests
• unlink
  • • OS dir (mkdir, makedirs, remove, rmdir)
• unzip
  • • Extract zip file
• UPDATE
  • • Update data
• UPDATE|sqlite
  • • UPDATE data in SQLite database
• urllib
  • • get HTML page using urllib
• ValueError
  • • Raise ValueError exception
• values
  • • values
    • Does the value exist?
• version
  • • Using Modules
• version_info
  • • sys module
• VERTICAL
  • • Python Tk Scale
• virtualenv
  • • Virtualenv
• wait
  • • Fork
    • Forking
• wait_for_tasks
  • • Multitasking example with wait
• waitKey
  • • OpenCV Read image
• walk
  • • Traverse directory tree - list directories recursively
• warn
  • • Warnings
• WHERE
  • • Select some data WHERE clause
• with
  • • Open and read file using with (recommended)
    • Filehandle using with and not using it
    • Context manager: with for file
    • With - context managers
• Workbook
  • • Create an Excel file from scratch
• write
  • • Writing to file
    • Writing to standard error (stderr)
• WSGI
  • • Hello world web
• wxWidgets
  • • GUI Toolkits
• xml
  • • XML Data
• xml.parsers.expat
  • • Expat - Callbacks
• xrange
  • • range vs xrange in Python
• YAML
  • • YAML - YAML Ain't Markup Language
• ZeroDivisionError
  • • A simple exception
    • Catch ZeroDivisionError exception
    • Handle divide by zero exception
• zip
  • • Solution: Combine lists with tuple
    • Extract zip file
• zipfile
  • • Extract zip file
• {}
  • • Dictionary
• ~
  • • expanduser - handle tilde ~ the home directory of the user