Best post on Order of Operations – Python

Order of Operations

Order of Operations in python is also known as operator precedence. For evaluation of mathematical expression rule of operator precedence plays important role. The acronym PEMDAS is simple way to remember rules for evaluation :
P – Parenthesis
E – Exponentiation
M – Multiplication
D – Division
A – Addition
S – Subtraction

Highest Precedence operator in Parenthesis and lowest precedence operator is OR

Table for operator precedence

order of operations
<strong><span class="has-inline-color has-vivid-green-cyan-color">Order of Operations or Operator Precedence</span></strong>

NOTE: If paranthesis is not considered as an operator than the highest precedence is given to Exponent operator **

Examples for operator precedence:

>>> 200/200+(100+100)
201.0
>>>
>>> a=10
>>> b=20
>>> c=15
>>> (a+b)*(c+b)-150
900
>>> (a+b)*c+b-150
320
>>> a+b**2
410
>>> a or b + 20
10
>>> c or a + 20
15
>>> c and a + 20
30
>>> a and b + 20
40
>>> a>b>c
False
>>> 

Associativity

1. If there are multiple operators of same group then associativity is vital.
2. Associativity decides the order of operators having same precedence value.
3. Left-to-right associability rule is followed by all operators.
4. Example 143-43+50, in this – and + both belongs to same group. So as per Left-to-right associability rule first subtraction will be performed and then addition.

Non Associative operators

1. As there is no associability for python assignment operator and comparison operators separate rules for sequencing are present for such operators.
2. Example a>b>c ,it is simplified as a>b and b>c then evaluates from left-to-right pattern.

For other python basics related posts:

Best post on programming language and its types – 1
Python Programming (Basics) – History & Features
Python Programming (Basics)- Debugging & Types of errors
Python Programming (Basics) – Variables, Values, Types & Keywords.
Best post on built-in functions in python – 1
Python Programming (Basics) – Type Conversion
Python Programming (Basics) – Comments,Indentation,Built-in Number Data types and Expressions
Best post on IDLE & script mode in Python – 1
Python Programming (Basics)- Operators in Python
Best post on Order of Operations – Python
Simple and compound statements of python in easy way
Best post on conditional statements in python – Part 1
Best post on conditional statements in python – Part 2
Best post on looping in python (for loop)-Part 1
Best post on looping in python (while loop)-Part 2
Best post on nested loop in python(looping) -Part 3
Best post on infinite loop in python(looping) -Part 4
Best post on control statements(break,continue,pass)-1
Best post on Function definition & calling in python -1
Easy flow of function execution,parameters,arguments-2
Easy fruitful & void function,return values,stack diagrams-3
Best post on types of function arguments in python- 4
Best post on recursive function, scope of variable-5
Best post on import and from statement in python – 1
Best post on modules and built-in modules math,random & time-2
Best post on user defined modules in python-3
Best post on string datatype in python – 1
Best post immutable string,string operations python-2
Best post on string methods in python – 3
Best post on list datatype in python – 1
Best post on mutable list, list operations python – 2
Best post on List methods in python – 3
Best post on dictionary datatype in python – 1
Best post on dictionary methods and operations-2
Best post on tuple datatype in python – 1
Best post on tuple operations and immutable tuple- 2
Best post on tuple methods and built-in functions-3
17 -Python program to demonstrate Button in tkinter and its event in easy way
New posts coming soon.......

For other advanced python related posts:

File Systems and File Handling in Python
Types of file modes and attributes of file object in Python
How to read,write and append in a file in python?
Remaining file methods in Python
File Positions in Python
Directory in Python and its methods
Iterator and Iterables in Python
Exceptions in Python
Exception Handling in Python (Part I)
Exception Handling in Python (Part II)
Regular Expressions
Metacharacters or Regular Expression Patterns
Functions in 're' module(Part I)- Match vs Search
Functions in 're' module(Part II)-findall(), split(), sub()
Flags for regular expressions(Modifiers)
GUI programming in Python and Python GUI Library
What is Tkinter ?
Layout Manager (Geometry Manager) in Python
Events and Bindings in Python along with Widget configuration and styling
Fonts Names, Font Descriptors, System Fonts, Text formatting, Borders, Relief Styles in Python
Best post:Dimensions, Anchors, Bitmaps & Cursors in Python
Canvas widget of tkinter module – Python
Widgets in tkinter module – Python
Label, Text, Entry & Message Widget in Python
Button, Checkbutton & Radiobutton Widget in Python
Best post on Menu and Menubutton Widget of tkinter
Best post- Listbox and Scrollbar(Slider) Widget-Python
Best post on Frame Widget of tkinter in Python
Best post: message box widget and its methods
Best post- LabelFrame, Toplevel, PanedWindow widgets
Best post on Spinbox and Scale Widget in Python
Best post : Database connectivity in Python (Part 1)
Best post : Database Connectivity in Python (Part 2)
Best post on Create and Insert query : Python + MySQL
Best post on Select Query to Search & Read: Python + MySQL-4
Best post on Update query and Delete query : Python + MySQL-4
New posts coming soon.......

Leave a Comment