Wednesday, August 29, 2018

Python Tutorial for Beginners 7 - Creating and Executing your First Pyth...



In this video I am going to show How to Create, Save, Run a Python .py file. This video will also give the answer to the question which is , How do I run a Python program on a terminal or without any IDE/ Editor?.
We an write Python scripts in text files with the suffix .py. First you need to save python codes in hello.py file? The scripts can be read by the interpreter in several ways:

Examples:
you can directly double click on you .py (e.g. hello.py) file and it will open in the terminal.

$ python hello.py

# This will simply execute the script and return to the terminal afterwards

$ python -i hello.py

# The -i flag keeps the interpreter open after the script is finished running

$ python

execfile('hello.py')
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Python Tutorial for Beginners 6 - Python Built-in Functions and Built-in...





In this Video I am going to show How to use Built-in Functions and Built-in Modules in Python . Python library contains built-in modules (written in C) that provide access to system functionality such as file I/O that would otherwise be inaccessible to Python programmers, as well as modules written in Python
The Python has a number of Built in functions and types that are always available. Some of these Functions are
abs() delattr() hash() memoryview() set()
all() dict() help() min() setattr()
any() dir() hex() next() slice()
ascii() divmod() id() object() sorted()
bin() enumerate() input() oct() staticmethod()
bool() eval() int() open() str()
breakpoint() exec() isinstance() ord() sum()
bytearray() filter() issubclass() pow() super()
bytes() float() iter() print() tuple()
callable() format() len() property() type()
chr() frozenset() list() range() vars()
classmethod() getattr() locals() repr() zip()
compile() globals() map() reversed() __import__()
complex() hasattr() max() round()

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Tuesday, August 28, 2018

Python Tutorial for Beginners 5 - Python print() and input() Function



In this Video I am going to show How to use print() Function and input() Function in Python. In python The print() function is used to print the specified message to the The console or terminal, or other standard output device. The input function in python is used to take user input.The input function then reads a line from input, converts it to a string (stripping a trailing newline), and returns that.
Python also support C-style string formatting in order to create a new formatted strings.

%s - String (
%d - Integers
%f - Floating point numbers
%.(number of decimal places)f - Floating point numbers

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-------------------------Stuff I use to make videos -------------------
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Ubuntu notebook -
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Python Tutorial for Beginners 4 - Python Variables and Types





In this Python Tutorial for Beginners Video I am going to show How to use Python Variables and Types. I will show How to declare variable, How to use Variable, How to Type cast variables In Python.
So what is a Variable ? A variable is a named place in the memory where a we can store data and later retrieve the data using the variable “name”. we get to choose the names of the variables. Also we can change the contents of a variable in a later statement.

As we discussed Python Introduction Video, that Python is completely object oriented and not "statically typed" i.e. Python is dynamically typed language. So we do not need to declare
variables before using them . In addition we don't need to declare the variable type type. Every variable in Python is an object.

Python Variable Name Rules
Variable Must start with a letter or underscore _
Variable Must consist of letters and numbers and underscores
Variable are Case Sensitive
Good: name age tom25 _max
Bad: 45name
#name age.22
Different: name Name NAME

Reserved Words
It is not allowed to use reserved words as variable names / identifiers
and del for is raise
assert elif from lambda return
break else global not try
class except if or while
continue exec import pass yield
def finally in print

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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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notebook mouse –
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Monday, August 27, 2018

Python Tutorial for Beginners 3 - Basic Math, Mathematical Operators and...



In this Video I am going to show How to Use Basic Math, Mathematical Operators and Python Expressions In python.
So what is an expression ? An expression is A data value or set of operations to compute a value.
Arithmetic operators we will use:
+ - * / addition, subtraction/negation, multiplication, division
% modulus, a.k.a. remainder
** exponentiation
precedence: Order in which operations are computed.

Mathematical Operators
Here are some commonly used mathematical operators

Syntax Math Operation Name
a+b {\displaystyle a+b\,} a+b\, addition
a-b {\displaystyle a-b\,} a-b\, subtraction
a*b {\displaystyle a\times b\,} a\times b\, multiplication
a/b {\displaystyle a\div b\,} a\div b\, division (see note below)
a//b {\displaystyle \lfloor a\div b\,\rfloor } \lfloor a\div b\,\rfloor floor division (e.g. 5//2=2) - Available in Python 2.2 and later
a%b {\displaystyle a~{\bmod {~}}b\,} a~{\bmod ~}b\, modulo
-a {\displaystyle -a\,} -a\, negation
abs(a) {\displaystyle |a|\,} |a|\, absolute value
a**b {\displaystyle a^{b}\,} a^{b}\, exponent

Order of Operations (Python Operator Precedence)
Highest precedence at top, lowest at bottom.Operators in the same box evaluate left to right..

Name Syntax PEMDAS Mnemonic
Parentheses ( ... ) Please
Exponents ** Excuse
Multiplication
and Division * , / , // , % My Dear
Addition
and Subtraction + , - Aunt Sally
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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 –
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notebook mouse –
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