ProgrammingKnowledge

Python Unit Testing With PyTest 1 - Getting started with pytest

2018-10-16T15:42:00.001-07:00

In this Python Unit Testing With PyTest video I am going to show you :
- What is Unit Testing
- Advantages of unit testing
- Available unit testing frameworks in python
- How to install pytest using pip
- write unit tests for our python script
- run unit tests using pytest
- commonly used pytest commands

What is Unit Testing - According to wikipedia, unit testing is a software testing method by which individual units of source code are tested to determine whether they are fit for use.

Why Unit Test? -
Tests Reduce Bugs in New Features and Existing Features
Tests Are Good Documentation
Tests Reduce the Cost of Change
Faster Debugging
Faster Development
Better Design

Python Testing frameworks
unittest - In the Python Standard Library
nose - Not in the Standard Library. Simpler tests than unittest
pytest - Not in the Python Standard Library.

run with following command:
pytest test_math_func.py -v
or
py.test

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Python Tutorial for Beginners 54 - How to Install Pip packages using PyC...

2018-10-11T15:06:00.001-07:00

In this Python Programming Tutorial for Beginners video I am going to show you How to Install Pip packages using PyCharm or How to use PyCharm for installing and managing Pip and PyPI (Python Package Index) Python packages. So What Is PIP for Python? The pip is a command line tool for installing and managing Python packages, which a generally available in the Python Package Index. The official website for Python Package Index (PyPI) is https://pypi.org. PyPI enables us to find and install python related software developed and shared by the Python community. How to Install PIP for Python on Windows, Mac, and Linux ? if you have python version 3.4 or above mos probaply python PIP is pre installed on your system.
So let us see How to install library in Pycharm?

Give the following command to get the help:
pip --help

Usage:
pip [command] [options]

Commands:
install Install packages.
download Download packages.
uninstall Uninstall packages.
freeze Output installed packages in requirements format.
list List installed packages.
show-Show information about installed packages.
check-Verify installed packages have compatible dependencies.
config - Manage local and global configuration.
search-Search PyPI for packages.
wheel-Build wheels from your requirements.
hash-Compute hashes of package archives.
completion-A helper command used for command completion.
help Show help for commands.

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Python Tutorial for Beginners 53 - How to use Pip and PyPI for managing ...

2018-10-10T14:23:00.001-07:00

In this Python Programming Tutorial for Beginners video I am going to show you How to use Pip and PyPI (Python Package Index) for installing and managing Python packages. So What Is PIP for Python? The pip is a command line tool for installing and managing Python packages, which a generally available in the Python Package Index. The official website for Python Package Index (PyPI) is https://pypi.org. PyPI enables us to find and install python related software developed and shared by the Python community. How to Install PIP for Python on Windows, Mac, and Linux ? if you have python version 3.4 or above mos probaply python PIP is pre installed on your system. Goive the following command to get the help:
pip --help

Usage:
pip [command] [options]

Commands:
install Install packages.
download Download packages.
uninstall Uninstall packages.
freeze Output installed packages in requirements format.
list List installed packages.
show-Show information about installed packages.
check-Verify installed packages have compatible dependencies.
config - Manage local and global configuration.
search-Search PyPI for packages.
wheel-Build wheels from your requirements.
hash-Compute hashes of package archives.
completion-A helper command used for command completion.
help Show help for commands.

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Python Tutorial for Beginners 52 - How to use PyCharm to debug Python code

2018-10-06T16:00:00.001-07:00

In this Python Programming Tutorial for Beginners video I am going to show you How to Get started with the Python debugger in Python Using Python PDB. The Python Debugger or pdb is a module, pdb, for interactive code debugging.To start debugging on PyCharm IDE, you have to set breakpoints first. To create a breakpoint, just click the left gutter. PyCharm allows starting the debugger session in several ways.

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Python Tutorial for Beginners 51 - An Introduction to Python Debugger (...

2018-10-05T15:52:00.001-07:00

In this Python Programming Tutorial for Beginners video I am going to show you How to Get started with the Python debugger in Python Using Python PDB. The Python Debugger or pdb is a module, pdb, for interactive code debugging.Debugging is the process of removing errors from our code. Python Debugger or pdb is perhaps most simple usages is to insert a breakpoint:
import pdb; pdb.set_trace(). When reached, the debugger is started with the prompt “(Pdb).
Pdb command examples
help/h: Displays the list of commands
step/s: Single step the program, step into functions.
next/n: Single step in the current function
pp/p: Pretty printing/printing a variable
cont/c: Continue execution
quit/q: Quit the debugger

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-------------------------Stuff I use to make videos -------------------
Stuff I use to make videos
Windows notebook – http://amzn.to/2zcXPyF
Apple MacBook Pro – http://amzn.to/2BTJBZ7
Ubuntu notebook - https://amzn.to/2GE4giY
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Python Tutorial for Beginners 49 - Python Decorators

2018-10-02T17:06:00.003-07:00

In this Python Programming Tutorial for Beginners video I am going to show you How to use decorators in Python. Decorators wrap a function and modify its behaviour in some way or the
another, without having to directly change the source code of the function being decorated. this is the simple A guide to Python's function decorators. In this video we will Write a function decorator that can be used to measure the run time of a functions.

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Python Tutorial for Beginners 49 - Python Decorators

2018-10-02T17:06:00.001-07:00

Python Tutorial for Beginners 48 - Python Closures + nested functions

2018-09-29T16:00:00.001-07:00

In this Python Programming Tutorial for Beginners video I am going to show you How to use Python Closures and nested functions in python.A Closure is a function object that remembers values which are declared outside the functions.
In Functional programming Functions are first-class citizens i.e. Functions can be used as any other datatype, eg: Arguments to function, Return values of functions, Assigned to variables, Parts of tuples, lists, etc. Functional programming gives The ability to treat functions just like any other values. Closure lexical environments are stored in the property __closure__ of a function. Python supports functional programming idioms

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-------------------------Stuff I use to make videos -------------------
Stuff I use to make videos
Windows notebook – http://amzn.to/2zcXPyF
Apple MacBook Pro – http://amzn.to/2BTJBZ7
Ubuntu notebook - https://amzn.to/2GE4giY
Desktop - http://amzn.to/2zct252
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Python Tutorial for Beginners 47 - Lambda, filter, reduce and map

2018-09-28T18:12:00.001-07:00

In this Python Programming Tutorial for Beginners video I am going to show you How to use Lambda function in python. In Addition I am going to show How to used lambda function with functions like filter, reduce und map.As a multi-parameter language, Python also supports functional programming. Lambda functions come from functional programming. Lambda functions are also called one line functions or anonymous functions
Anonymous functions are particularly advantageous when using the map, filter and reduce functions. In Functional programming Functions are first-class citizens i.e. Functions can be used as any other datatype, eg: Arguments to function, Return values of functions, Assigned to variables, Parts of tuples, lists, etc. The lambda expression must fit on one line

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-------------------------Stuff I use to make videos -------------------
Stuff I use to make videos
Windows notebook – http://amzn.to/2zcXPyF
Apple MacBook Pro – http://amzn.to/2BTJBZ7
Ubuntu notebook - https://amzn.to/2GE4giY
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Python Tutorial for Beginners 45 - Python, argparse, and command line ar...

2018-09-26T12:36:00.001-07:00

In this Python Programming Tutorial for Beginners video I am going to show you How to use argparse to parse python scripts parameters.So basically we will discuss: What are command line arguments, Why we use command line arguments, How to parse command line arguments with Python. argparse is a in build module in python using which we an pass command line arguments with our python script.The argparse module makes it easy to write user-friendly command-line interfaces. The program defines what arguments it requires, and argparse will figure out how to parse those out of sys.argv. So we just need to import argparse into out python program and use it.
So let us see Build Command Line Interface using Argparse in Python.

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-------------------------Stuff I use to make videos -------------------
Stuff I use to make videos
Windows notebook – http://amzn.to/2zcXPyF
Apple MacBook Pro – http://amzn.to/2BTJBZ7
Ubuntu notebook - https://amzn.to/2GE4giY
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Python Tutorial for Beginners 45 - Python Generators

2018-09-25T14:59:00.001-07:00

In this Python Programming Tutorial for Beginners video I am going to show you How to create and use Generators in Python. Generators are simple way defining iterators in python.Generators appears similar to functions, but they keep the state of their variables between calls, and they use yield instead of return. Also calling them again resumes execution after the yield statement.
Python does not allow 'yield' inside a 'try' block with a 'finally' clause. when using iterators, in order to create our own Iterator class we need to implement __iter__() and __next__() methods in your class. But with Python Generators we need to implement __iter__() and __next__() methods. In addition The generators raise the StopIteration exception automatically. So generatora are much easier to implement then iterators.

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-------------------------Stuff I use to make videos -------------------
Stuff I use to make videos
Windows notebook – http://amzn.to/2zcXPyF
Apple MacBook Pro – http://amzn.to/2BTJBZ7
Ubuntu notebook - https://amzn.to/2GE4giY
Desktop - http://amzn.to/2zct252
Microphone – http://amzn.to/2zcYbW1
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Python Tutorial for Beginners 43 - Working With JSON Data in Python

2018-09-23T15:22:00.001-07:00

What Is JSON ? JSON Crash Course - https://youtu.be/KdweixONFyA
In this Python Programming Tutorial for Beginners video I am going to show you How to Work With JSON Data in Python . In addition I am going to show Read and Write JSON to a File in Python. So we will see How to convert dict, list, tuple, str, integer, float, boolean to Json using python built in json package and How to Parse JSON in Python. This tutorial will give you basic Understanding of JSON Data Format with Python.

Conversions
From:

https://docs.python.org/3/library/jso...
JSON--to--Python
object--to--dict
array--to--list
string--to--str
number (int)--to--int
number (real)--to--float
true--to--True
false--to--False
null--to--None

How to create Json ? and Where Json can be used in today's Software development processes and programming languages. “JSON” stands for “JavaScript Object Notation”
Despite the name, JSON is a (mostly) language-independent way of specifying objects as name-value pairs. Json Commonly used in Web as a vehicle to describe data being sent between systems. JSON or JavaScript Object Notation is a lightweight text-based open standard designed for human-readable data interchange.I will show you how to create JSON objects and arrays and also how to make a .json file

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Python Tutorial for Beginners 42 - Reading Files in Python

2018-09-22T15:42:00.001-07:00

In this Python Tutorial for Beginners video I am going to show you How to read files in Python . To open a file in Python we use open() function.open() returns a file object, and is most commonly used with two arguments: open(filename, mode).Before we can write to the file we must tell Python which file we are going to work with and what we will be doing with the file. This is done with the open() function. open() returns a “file handle” - a variable used to perform operations on the file
Kind of like “File - Open” in a Word Processor.
name = open("filename")- opens the given file for reading, and returns a file object
name.read() - file's entire contents as a string
name.readline() - next line from file as a string
name.readlines() - file's contents as a list of lines
The “r” is called the “access mode”. r is for reading, if the file does not exist, an error is raised
w is for writing- If the file exists, the contents are overwritten. If the file does not exist, it will be created
a is for appending- If the file exists new data is appended to the end of the file. If the file does not exist, it will be created

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Python Tutorial for Beginners 40 - Idea behind : if name == "main"

2018-09-21T05:21:00.001-07:00

In this Python Tutorial for Beginners video I am going to show you the Idea behind using : if __name__ == "__main__" in Python. __name__ is a built in variable in Python. the value of __name__ is set to "__main__" at runtime. Each module has a name, and this name can be used to access instructions in a module. This is especially useful in a given situation: As mentioned before, the main block of a module is executed when it is imported for the first time. But what do we do if we want the block to run only if the module was started as a stand-alone program, but not if it was imported from another module? We can do this by evaluating the attribute __name__ of the module.
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Python Tutorial for Beginners 39 - Raising Custom Exceptions (Writing an...

2018-09-20T14:26:00.001-07:00

In this Python Tutorial for Beginners video I am going to show How to Write and Use Custom Exceptions in Python with an Example. So we will see the Proper way to declare custom exceptions in modern Python 3. So let us see How to Make your Python code more readable with custom exception classes. For creating your own custom Exception class in python we need to inherit from the base exception class i.e. Exception. Custom Exception class should typically be derived from the Exception class, either directly or indirectly. Custom Exception Class are also called User-defined Exceptions in python.
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Python Tutorial for Beginners 37 - Try Except Else Finally (Python Excep...

2018-09-18T18:43:00.001-07:00

In this Python Tutorial for Beginners video I am going to show How to use Try Except Else Finally in Exception handling in Python.
else: statements executed if no exception
finally:clean-up statements always executed
A finally clause is always executed before leaving the try statement. A finally statements is guaranteed to be executed before leaving the try statement, whether an exception has occurred or not.
What are these exceptions? An exception is an event, which happens while the execution of a program, that disrupts the normal flow of the program. When some error error occurs an exception is raised. Python Exceptions are run-time errors. Exceptions are used to deal with extraordinary errors. Normally if we do not use Exception handling the execution of program stops as soon as exception is thrown.By default, the interpreter handles exceptions by stopping the program and printing an error message.

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List of exception in Python
CLASSES
object
BaseException
Exception
ArithmeticError
FloatingPointError
OverflowError
ZeroDivisionError
AssertionError
AttributeError
BufferError
EOFError
ImportError
LookupError
IndexError
KeyError
MemoryError
NameError
UnboundLocalError
OSError
BlockingIOError
ChildProcessError
ConnectionError
BrokenPipeError
ConnectionAbortedError
ConnectionRefusedError
ConnectionResetError
FileExistsError
FileNotFoundError
InterruptedError
IsADirectoryError
NotADirectoryError
PermissionError
ProcessLookupError
TimeoutError
ReferenceError
RuntimeError
NotImplementedError
RecursionError
StopAsyncIteration
StopIteration
SyntaxError
IndentationError
TabError
SystemError
TypeError
ValueError
UnicodeError
UnicodeDecodeError
UnicodeEncodeError
UnicodeTranslateError
Warning
BytesWarning
DeprecationWarning
FutureWarning
ImportWarning
PendingDeprecationWarning
ResourceWarning
RuntimeWarning
SyntaxWarning
UnicodeWarning
UserWarning
GeneratorExit
KeyboardInterrupt

Python Tutorial for Beginners 35 - Python Exception handling + Python Tr...

2018-09-18T16:41:00.001-07:00

In this Python Tutorial for Beginners video I am going to show How to use Exception handling and Try Except in Python. What are these exceptions? An exception is an event, which happens while the execution of a program, that disrupts the normal flow of the program. When some error error occurs an exception is raised. Python Exceptions are run-time errors. Exceptions are used to deal with extraordinary errors. Normally if we do not use Exception handling the execution of program stops as soon as exception is thrown.By default, the interpreter handles exceptions by stopping the program and printing an error message.

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Python Tutorial for Beginners 34 - Python Abstract Classes

2018-09-17T16:18:00.001-07:00

In this Python Tutorial for Beginners video I am going to show How to use Abstract Classes in Python. The Fact is Python on its own can to provide abstract classes. But there is a mobile called 'abc' which stands for Abstract Base Classes (ABCs). and this 'abc' module we can import to create abstract classes in Python. So I am going to provide an Python Example to create Abstract Classes in Python.

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Python Tutorial for Beginners 34 - Python Aggregation + Difference in Ag...

2018-09-17T12:22:00.003-07:00

In this Python Tutorial for Beginners video I am going to show How to use Class Aggregation in Python. Also I am going to give the Difference between Aggregation and Composition with a python example.Aggregation represents Has-A relationship.
Aggregation has a unidirectional association i.e. a one way relationship between associated classes.In Aggregation, both the associate class objects can survive individually.

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Python Tutorial for Beginners 34 - Python Aggregation + Difference in Ag...

2018-09-17T12:22:00.001-07:00

Python Tutorial for Beginners 33 - Python Composition

2018-09-17T08:53:00.001-07:00

In this Python Tutorial for Beginners video I am going to show How to use Class Composition in Python. Composition allows us to delegate some responsibility from one class to another class.
In Class Composition one class acts like a Container and other acts like a content.
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Python Tutorial for Beginners 31 - Python Multiple Inheritance

2018-09-16T07:56:00.001-07:00

In this Python Tutorial for Beginners video I am going to show How to use Multiple Inheritance in Python. In Python the ability of a class to inherit from more than one classes is called Multiple Inheritance. A class in Python can inherit from more than one class.Classes in Python can be extended, creating new classes which retain characteristics of the base class and This process, known as inheritance. Python Inheritance Involves a superclass and a subclass. The subclass inherits the members of the superclass, on top of which it can add its own members. he idea of inheritance is that a class can be defined to borrow behavior (member variable and member methods) from another class.When we define a subclass, we place the name of the parent(superclass) in parentheses after the subclass’s(child) name on the first line of the definition.
class Parent(Child):

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Python Tutorial for Beginners 30 - How To Create Modules in Python 3

2018-09-15T17:13:00.001-07:00

In this video I am going to show you How To Create Modules in Python 3. So what is a module in Python? it turns out a module in Python is just a .py file which have some Python code(Python class or Python method).We can reference any Python file as a module. The name of the module will be the name of the file. I will cover How to import the class within the same directory or sub directory? in order to import classes from files within the same directory, we can in Python 3:

from .user import User

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Python Tutorial for Beginners 29 - Python Inheritance

2018-09-15T13:11:00.001-07:00

In this Python Tutorial for Beginners video I am going to show How to use Inheritance in Python.Classes in Python can be extended, creating new classes which retain characteristics of the base class and This process, known as inheritance. Python Inheritance Involves a superclass and a subclass. The subclass inherits the members of the superclass, on top of which it can add its own members. he idea of inheritance is that a class can be defined to borrow behavior (member variable and member methods) from another class.When we define a subclass, we place the name of the parent(superclass) in parentheses after the subclass’s(child) name on the first line of the definition.
class Parent(Child):

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Python Tutorial for Beginners 28 - Private methods in Python

2018-09-14T09:45:00.003-07:00

In this Python Tutorial for Beginners video I am going to show How to declare Private methods in Python. To create a private method in a class you can use double underscores in front of your member, so you they are made local to the class.
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