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szabo g 1000 python examples 2020 fix

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Textbook in PDF format This version was published on 2020-09-21 Fixtures and Mocking in Python How do you test Moon-landing? How do you test a system … Plan About me Goal Fixtures Fixtuers in Pytest Traditional xUnit fixtures Dependency Injection Temporary directory - tmpdir Capture STDOUT and STDERR - capsys Home-made fixture Home-made fixture - conftest Home-made fixture with tempdir Home-made fixture with yield Fixture Autouse Fixture Autouse with yield Fixture for MongoDB Test Doubles Test Doubles explained Verify behavior or state? What is Mocking and Monkey Patching? Situations Unit testing vs. Integration testing Experiment with mocking in various situations Examples are simple Hard coded path Manually Patching attribute Monkey Patching attribute Monkey Patching functions Monkey Patching dictionary items Mocking a whole class Mocking input/output Mocking input/output Mocking random numbers Exercises Work in pairs Exercise: test login expiration Solution: test login expiration Exercise: Record e-mail sending Solution: Record e-mail sending Exercise: Fixture database Exercise: One Dimentsional space-fight Exercise: web client Exercise: Open WeatherMap client Exercise: Mocking A Bank Testing the whole application Resources Retrospective Job searching help Solutions - game Solutions - Mocking the database access First steps What is Python? What is needed to write a program? The source (code) of Python Python 2 vs. Python 3 Installation Installation on Linux Installation on Apple Mac OSX Installation on MS Windows Editors, IDEs Documentation Program types Python on the command line First script - hello world Examples Comments Variables Exercise: Hello world What is programming? What are the programming languages A written human language A programming language Words and punctuation matter! Literals, Value Types in Python Floating point limitation Value Types in Numpy Rectangle (numerical operations) Multiply string Add numbers Add strings Exercise: Calculations Solution: Calculations Second steps Modules A main function The main function - called Indentation Conditional main Input - Output I/O print in Python 2 print in Python 3 print in Python 2 as if it was Python 3 Exception: SyntaxError: Missing parentheses in call Prompting for user input in Python 2 Prompting for user input in Python 3 Python2 input or raw_input? Prompting both Python 2 and Python 3 Add numbers entered by the user (oups) Add numbers entered by the user (fixed) How can I check if a string can be converted to a number? Converting string to int Converting float to int Conditionals: if Conditionals: if - else Divide by 0 Conditionals: if - else (other example) Conditionals: else if Conditionals: elif Ternary operator (Conditional Operator) Case or Switch in Python Exercise: Rectangle Exercise: Calculator Exercise: Age limit Exercise: What is this language? Exercise: Standard Input Solution: Area of rectangle Solution: Calculator Solution: Calculator eval Solution: Age limit Solution: What is this language? Command line arguments Command line arguments - len Command line arguments - exit Exercise: Rectangle (argv) Exercise: Calculator (argv) Solution: Area of rectangle (argv) Solution: Calculator (argv) Solution: Calculator eval Compilation vs. Interpretation Is Python compiled or interpreted? Flake8 checking Pylint checking Numbers Numbers Operators for Numbers Integer division and the future Pseudo Random Number (unform distribution) Fixed random numbers Rolling dice - randrange Random choice built-in method Exception: TypeError: ‘module’ object is not callable Fixing the previous code Exception: AttributeError: module ‘random’ has no attribute Exercise: Number guessing game - level 0 Exercise: Fruit salad Solution: Number guessing game - level 0 Solution: Fruit salad Comparison and Boolean if statement again Comparison operators Compare numbers, compare strings Do NOT Compare different types! Complex if statement with boolean operators Boolean operators Boolean truth tables Boolean values: True and False Using True and False in variables Comparison returns True or False Assign comparisons to variables Flag Toggle Short circuit Short circuit fixed Does this value count as True or False? True and False values in Python Incorrect use of conditions Exercise: compare numbers Exercise: compare strings Solution: compare numbers Solution: compare strings Strings Single quoted and double quoted strings Long lines Triple quoted strings (multiline) String length (len) String repetition and concatenation A character in a string String slice (instead of substr) Change a string How to change a string String copy String functions and methods (len, upper, lower) index in string index in string with range rindex in string with range find in string Find all in the string in string index if in string Encodings: ASCII, Windows-1255, Unicode raw strings ord ord in a file chr - number to character Exercise: one string in another string Exercise: to ASCII CLI Exercise: from ASCII CLI Solution: one string in another string Solution: compare strings Solution: to ASCII CLI Solution: from ASCII CLI Loops Loops: for-in and while for-in loop on strings for-in loop on list for-in loop on range Iterable, iterator for in loop with early end using break for in loop skipping parts using continue for in loop with break and continue while loop Infinite while loop While with complex expression While with break While True Duplicate input call Eliminate duplicate input call do while loop while with many continue calls Break out from multi-level loops Exit vs return vs break and continue Exercise: Print all the locations in a string Exercise: Number guessing game Exercise: Count unique characters Exercise: Convert for-loop to while-loop Solution: Print all the locations in a string Solution 1 for Number Guessing Solution 2 for Number Guessing (x) Solution 3 for Number Guessing (s) Solution for Number Guessing (debug) Solution for Number Guessing (move) Solution for Number Guessing (multi-game) Solution: Count unique characters Solution: Convert for-loop to while-loop Formatted printing format - sprintf Examples using format - indexing Examples using format with names Format columns Examples using format - alignment Format - string Format characters and types Format floating point number f-strings (formatted string literals) printf using old %-syntax Format braces, bracket, and parentheses Examples using format with attributes of objects raw f-strings Lists Anything can be a list Any layout Lists List slice with steps Change a List Change with steps List assignment and list copy Shallow vs. Deep copy of lists join join list of numbers split for loop on lists in list Where is the element in the list Index improved .insert .append .remove Remove element by index .pop Remove first element of list Remove several elements of list by index Use list as a queue Queue using deque from collections Fixed size queue List as a stack stack with deque Exercies: Queue Exercise: Stack Exercise: MasterMind Solution: Queue with list Solution: Queue with deque Solution: Reverse Polish calculator (stack) with lists Solution: Reverse Polish calculator (stack) with deque Solution: MasterMind MasterMind to debug Debugging Queue sort sort numbers sort mixed key sort sort with sorted sort vs. sorted key sort with sorted Sorting characters of a string range Looping over index Enumerate lists List operators List of lists List assignment List documentation tuple Sort tuples Exercise: color selector menu Exercise: count digits Exercise: Create list Exercise: Count words Exercise: Check if number is prime Exercise: DNA sequencing Solution: menu Solution: count digits Solution: Create list Solution: Count words Solution: Check if number is prime Solution: DNA sequencing Solution: DNA sequencing with filter Solution: DNA sequencing with filter and lambda .extend append vs. extend split and extend Files File types: Text vs Binary Open vs. Read vs. Load Binary files: Images Reading an Excel file Open and read file (easy but not recommended) Open and read file using with (recommended) Read file remove newlines Filename on the command line Filehandle with return Read all the lines into a list Read all the characters into a string (slurp) Not existing file Open file exception handling Open many files - exception handling Writing to file Append to file Binary mode Does file exist? Is it a file? Direct access of a line in a file Exercise: count numbers Exercise: strip newlines Exercise: print lines with Report: Exercise: color selector Exercise: ROT13 Exercise: Combine lists Solution: count numbers Solution: strip newlines Solution: print lines with Report: Solution: color selector Solution: Combine lists Filehandle using with and not using it Dictionary (hash) What is a dictionary When to use dictionaries Dictionary keys Loop over keys Loop over dictionary keys Loop using items values Not existing key Get key Does the key exist? Does the value exist? Delete key List of dictionaries Shared dictionary immutable collection: tuple as dictionary key immutable numbers: numbers as dictionary key Sort dictionary by value Sort dictionary keys by value Insertion Order is kept Change order of keys in dictionary - OrderedDict Set order of keys in dictionary - OrderedDict Exercise: count characters Exercise: count words Exercise: count words from a file Exercise: Apache log Exercise: Combine lists again Exercise: counting DNA bases Exercise: Count Amino Acids Exercise: List of dictionaries Exercise: Dictinoary of dictionaries Exercise: Age limit with dictionaries Solution: count characters Default Dict Solution: count characters with default dict Solution: count words Solution: count words in file Solution: Apache log Solution: Combine lists again Solution: counting DNA bases Solution: Count Amino Acids Do not change dictionary in loop Sets sets set operations Creating a set Creating an empty set Adding an element to a set (add) Merging one set into another set (update) set intersection set subset set symmetric difference set union set relative complement Functions (subroutines) Why use functions? Defining simple function Passing positional parameters to a function Function parameters can be named Mixing positional and named parameters Default values, optional parameters, optional parameters Default value in first param Several defaults, using names Arbitrary number of arguments * Fixed parmeters before the others Arbitrary key-value pairs in parameters ** Extra key-value pairs in parameters Every parameter option Duplicate declaration of functions (multiple signatures) Pylint duplicate declaration Return more than one value Recursive factorial Recursive Fibonacci Non-recursive Fibonacci Unbound recursion Variable assignment and change - Immutable Variable assignment and change - Mutable Parameter passing of functions Passing references Function documentation Sum ARGV Copy-paste code Copy-paste code fixed Copy-paste code further improvement Palindrome Exercise: statistics Exercise: recursive Exercise: Tower of Hanoi Exercise: Merge and Bubble sort Exercise: Refactor previous solutions to use functions Solution: statistics Solution: recursive Solution: Tower of Hanoi Solution: Merge and Bubble sort Modules Before modules Create modules path to load modules from - The module search path sys.path - the module search path Flat project directory structure Absolute path Relative path Python modules are compiled How “import” and “from” work? Runtime loading of modules Conditional loading of modules Duplicate importing of functions Script or library Script or library - import Script or library - from import assert to verify values mycalc as a self testing module doctest Scope of import Export import Export import with all import module Execute at import time Import multiple times Exercise: Number guessing Exercies: Scripts and modules Exercise: Module my_sum Exercise: Convert your script to module Exercise: Add doctests to your own code Solution: Module my_sum Regular Expressions What are Regular Expressions (aka. Regexes)? What are Regular Expressions good for? Examples Where can I use it ? grep Regexes first match Match numbers Capture Capture more Capture even more findall findall with capture findall with capture more than one Any Character Match dot Character classes Common characer classes Negated character class Optional character Regex 0 or more quantifier Quantifiers Quantifiers limit Quantifiers on character classes Greedy quantifiers Minimal quantifiers Anchors Anchors on both end Match ISBN numbers Matching a section Matching a section - minimal Matching a section negated character class DOTALL S (single line) MULTILINE M Two regex with logical or Alternatives Grouping and Alternatives Internal variables More internal variables Regex DNA Regex IGNORECASE Regex VERBOSE X Substitution findall capture Fixing dates Duplicate numbers Remove spaces Replace string in assembly code Full example of previous Split with regex Exercises: Regexes part 1 Exercise: Regexes part 2 Exercise: Sort SNMP numbers Exercise: parse hours log file and give report Exercise: Parse ini file Exercise: Replace Python Exercise: Extract phone numbers Solution: Sort SNMP numbers Solution: parse hours log file and give report Solution: Processing INI file manually Solution: Processing config file Solution: Extract phone numbers Regular Expressions Cheat sheet Fix bad JSON Fix very bad JSON Raw string or escape Remove spaces regex Regex Unicode Anchors Other example PyCharm PyCharm Intro PyCharm configurations PyCharm Project PyCharm Files PyCharm - run code PyCharm Python console at the bottom left Refactoring example with PyCharm Python standard modules Some Standard modules sys Writing to standard error (stderr) Current directory (getcwd, pwd, chdir) OS dir (mkdir, makedirs, remove, rmdir) python which OS are we running on (os, platform) Get process ID OS path Traverse directory tree - list directories recursively os.path.join Directory listing expanduser - handle tilde ~ Listing specific files using glob External command with system subprocess subprocess in the background Accessing the system environment variables from Python Set env and run command shutil time sleep in Python timer Current date and time datetime now Converting string to datetime datetime arithmeticis Rounding datetime object to nearest second Signals and Python Sending Signal Catching Signal Catching Ctrl-C on Unix Catching Ctrl-C on Unix confirm Alarm signal and timeouts deep copy list deep copy dictionary Exercise: Catching Ctrl-C on Unix 2nd time Exercise: Signals Ctrl-z JSON JSON - JavaScript Object Notation dumps loads dump load Round trip Pretty print JSON Sort keys in JSON Set order of keys in JSON - OrderedDict Exercise: Counter in JSON Exercise: Phone book Exercise: Processes Solution: Counter in JSON Solution: Phone book Command line arguments with argparse Modules to handle the command line argparse Basic usage of argparse Positional argument Many positional argument Convert to integers Convert to integer Named arguments Boolean Flags Short names Exercise: Command line parameters Exercise: argparse positional and named argparse print help explicitely Argparse xor - mutual exlucise - only one - exactly one Exception handling Hierarchy of calls Handling errors as return values Handling errors as exceptions A simple exception Working on a list Catch ZeroDivisionError exception Module to open files and calculate something File for exception handling example Open files - exception Handle divide by zero exception Handle files - exception Catch all the exceptions and show their type List exception types Exceptions How to raise an exception Stack trace Exercies: Exception int conversion Exercies: Raise Exception Solution: Exception int conversion (specific) Solution: Exception int conversion (all other) Solution: Raise Exception Classes - OOP - Object Oriented Programming Why Object Oriented Programming? Generic Object Oriented Programming terms OOP in Python OOP in Python (numbers, strings, lists) OOP in Python (argparse) Create a class Import module containing class Import class from module Initialize a class - constructor, attributes Attributes are not special Create Point class Initialize a class - constructor, attributes Methods Stringify class Inheritance Inheritance - another level Modes of method inheritance Modes of method inheritance - implicit Modes of method inheritance - override Modes of method inheritance - extend Modes of method inheritance - delegate - provide Composition - Line Some comments Class in function Serialization of instances with pickle Quick Class definition and usage Exercise: Add move_rad to based on radians Exercise: Improve previous examples Exercise: Polygon Exercise: Number Exercise: Library Exercise: Bookexchange Exercise: Represent turtle graphics Solution - Polygon PyPi - Python Package Index What is PyPi? Easy Install pip Upgrade pip PYTHONPATH Virtualenv Virtualenv for Python 3 SQLite Database Access SQLite Connecting to SQLite database Create TABLE in SQLite INSERT data into SQLite database SELECT data from SQLite database A counter MySQL Install MySQL support Create database user (manually) Create database (manually) Create table (manually) Connect to MySQL Connect to MySQL and Handle exception Select data Select more data Select all data fetchall Select some data fetchmany Select some data WHERE clause Select into dictionaries Insert data Update data Delete data Exercise MySQL Exercise: MySQL Connection Solution: MySQL Connection PostgreSQL PostgreSQL install Python and Postgresql PostgreSQL connect INSERT INSERT (from command line) SELECT DELETE SQLAlchemy SQLAlchemy hierarchy SQLAlchemy engine SQLAlchemy autocommit SQLAlchemy engine CREATE TABLE SQLAlchemy engine INSERT SQLAlchemy engine SELECT SQLAlchemy engine SELECT all SQLAlchemy engine SELECT fetchall SQLAlchemy engine SELECT aggregate SQLAlchemy engine SELECT IN SQLAlchemy engine SELECT IN with placeholders SQLAlchemy engine connection SQLAlchemy engine transaction SQLAlchemy engine using context managers Exercise: Create table SQLAlchemy Metada SQLAlchemy types SQLAlchemy ORM - Object Relational Mapping SQLAlchemy ORM create SQLAlchemy ORM schema SQLAlchemy ORM reflection SQLAlchemy ORM INSERT after automap SQLAlchemy ORM INSERT SQLAlchemy ORM SELECT SQLAlchemy ORM SELECT cross tables SQLAlchemy ORM SELECT and INSERT SQLAlchemy ORM UPDATE SQLAlchemy ORM logging Solution: Create table Exercise: Inspector SQLAlchemy CREATE and DROP SQLAlchemy Notes SQLAlchemy Meta SQLite CREATE SQLAlchemy Meta Reflection SQLAlchemy Meta INSERT SQLAlchemy Meta SELECT And more

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