What are loops in Python

In this video we will discuss about loops in Python, we have basically 2 types of loops :

While loops: n python, while loop is used to execute a block of statements repeatedly until a given a condition is satisfied. And when the condition becomes false, the line immediately after the loop in program is executed.
While loops : For loops are used for sequential traversal. For example: traversing a list or string or array etc. In Python, there is no C style for loop, . There is “for in” loop which is similar to for each loop in other languages. Let us learn how to use for in loop for sequential traversals.

Python programming language provides following types of loops to handle looping requirements. Python provides three ways for executing the loops. While all the ways provide similar basic functionality, they differ in their syntax and condition checking time.

While Loop:

In python, while loop is used to execute a block of statements repeatedly until a given a condition is satisfied. And when the condition becomes false, the line immediately after the loop in program is executed.

Syntax :

while expression:
    statement(s)

All the statements indented by the same number of character spaces after a programming construct are considered to be part of a single block of code. Python uses indentation as its method of grouping statements.

Example:

# Python program to illustrate 
# while loop 
count = 0
while (count < 3):	 
	count = count + 1
	print("Hello Geek")

Output:

Hello Geek
Hello Geek
Hello Geek

Using else statement with while loops: As discussed above, while loop executes the block until a condition is satisfied. When the condition becomes false, the statement immediately after the loop is executed.

The else clause is only executed when your while condition becomes false. If you break out of the loop, or if an exception is raised, it won’t be executed.

If else like this:

if condition: 
	# execute these statements 
else: 
	# execute these statements

and while loop like this are similar

while condition: 
	# execute these statements 
else: 
	# execute these statements

Output:

Hello Geek
Hello Geek
Hello Geek
In Else Block

Single statement while block: Just like the if block, if the while block consists of a single statement the we can declare the entire loop in a single line as shown below:

# Python program to illustrate 
# Single statement while block 
count = 0
while (count == 0): print("Hello Geek")

Note: It is suggested not to use this type of loops as it is a never ending infinite loop where the condition is always true and you have to forcefully terminate the compiler.

for in Loop: For loops are used for sequential traversal. For example: traversing a list or string or array etc. In Python, there is no C style for loop, i.e., for (i=0; i<n; i++). There is “for in” loop which is similar to for each loop in other languages. Let us learn how to use for in loop for sequential traversals.

Syntax:

for iterator_var in sequence:
    statements(s)

It can be used to iterate over iterators and a range.

# Python program to illustrate 
# Iterating over a list 
print("List Iteration") 
l = ["geeks", "for", "geeks"] 
for i in l: 
	print(i) 
	
# Iterating over a tuple (immutable) 
print("\nTuple Iteration") 
t = ("geeks", "for", "geeks") 
for i in t: 
	print(i) 
	
# Iterating over a String 
print("\nString Iteration")	 
s = "Geeks"
for i in s : 
	print(i) 
	
# Iterating over dictionary 
print("\nDictionary Iteration") 
d = dict() 
d['xyz'] = 123
d['abc'] = 345
for i in d : 
	print("%s %d" %(i, d[i]))

Output:

List Iteration
geeks
for
geeks

Tuple Iteration
geeks
for
geeks

String Iteration
G
e
e
k
s

Dictionary Iteration
xyz  123
abc  345

Iterating by index of sequences: We can also use the index of elements in the sequence to iterate. The key idea is to first calculate the length of the list and in iterate over the sequence within the range of this length.

See the below example:

# Python program to illustrate 
# Iterating by index 

list = ["geeks", "for", "geeks"] 
for index in range(len(list)): 
	print list[index]

Output:

geeks
for
geeks

Using else statement with for loops: We can also combine else statement with for loop like in while loop. But as there is no condition in for loop based on which the execution will terminate so the else block will be executed immediately after for block finishes execution.

Below example explains how to do this:

# Python program to illustrate 
# combining else with for 

list = ["geeks", "for", "geeks"] 
for index in range(len(list)): 
	print list[index] 
else: 
	print "Inside Else Block"

Output:

geeks
for
geeks
Inside Else Block

Nested Loops: Python programming language allows to use one loop inside another loop. Following section shows few examples to illustrate the concept.

Syntax:

for iterator_var in sequence: 
	for iterator_var in sequence: 
		statements(s) 
		statements(s)

The syntax for a nested while loop statement in Python programming language is as follows:

while expression: 
	while expression: 
		statement(s) 
		statement(s)

A final note on loop nesting is that we can put any type of loop inside of any other type of loop. For example a for loop can be inside a while loop or vice versa.

# Python program to illustrate 
# nested for loops in Python 
from __future__ import print_function 
for i in range(1, 5): 
	for j in range(i): 
		print(i, end=' ') 
	print()

Output:

Loop Control Statements: Loop control statements change execution from its normal sequence. When execution leaves a scope, all automatic objects that were created in that scope are destroyed. Python supports the following control statements.

Continue Statement: It returns the control to the beginning of the loop.

# Prints all letters except 'e' and 's' 
for letter in 'geeksforgeeks': 
	if letter == 'e' or letter == 's': 
		continue
	print 'Current Letter :', letter 
	var = 10

Output:

Current Letter : g
Current Letter : k
Current Letter : f
Current Letter : o
Current Letter : r
Current Letter : g
Current Letter : k

Break Statement: It brings control out of the loop

for letter in 'geeksforgeeks': 

	# break the loop as soon it sees 'e' 
	# or 's' 
	if letter == 'e' or letter == 's': 
		break

print 'Current Letter :', letter

Output:

Current Letter : e

Pass Statement: We use pass statement to write empty loops. Pass is also used for empty control statement, function and classes.

# An empty loop 
for letter in 'geeksforgeeks': 
	pass
print 'Last Letter :', letter

Output:

Last Letter : s

#python #web-development #machine-learning

What is GEEK

Buddha Community

Shardul Bhatt

1626775355

Why use Python for Software Development

No programming language is pretty much as diverse as Python. It enables building cutting edge applications effortlessly. Developers are as yet investigating the full capability of end-to-end Python development services in various areas.

By areas, we mean FinTech, HealthTech, InsureTech, Cybersecurity, and that's just the beginning. These are New Economy areas, and Python has the ability to serve every one of them. The vast majority of them require massive computational abilities. Python's code is dynamic and powerful - equipped for taking care of the heavy traffic and substantial algorithmic capacities.

Programming advancement is multidimensional today. Endeavor programming requires an intelligent application with AI and ML capacities. Shopper based applications require information examination to convey a superior client experience. Netflix, Trello, and Amazon are genuine instances of such applications. Python assists with building them effortlessly.

5 Reasons to Utilize Python for Programming Web Apps

Python can do such numerous things that developers can't discover enough reasons to admire it. Python application development isn't restricted to web and enterprise applications. It is exceptionally adaptable and superb for a wide range of uses.

Robust frameworks

Python is known for its tools and frameworks. There's a structure for everything. Django is helpful for building web applications, venture applications, logical applications, and mathematical processing. Flask is another web improvement framework with no conditions.

Web2Py, CherryPy, and Falcon offer incredible capabilities to customize Python development services. A large portion of them are open-source frameworks that allow quick turn of events.

Simple to read and compose

Python has an improved sentence structure - one that is like the English language. New engineers for Python can undoubtedly understand where they stand in the development process. The simplicity of composing allows quick application building.

The motivation behind building Python, as said by its maker Guido Van Rossum, was to empower even beginner engineers to comprehend the programming language. The simple coding likewise permits developers to roll out speedy improvements without getting confused by pointless subtleties.

Utilized by the best

Alright - Python isn't simply one more programming language. It should have something, which is the reason the business giants use it. Furthermore, that too for different purposes. Developers at Google use Python to assemble framework organization systems, parallel information pusher, code audit, testing and QA, and substantially more. Netflix utilizes Python web development services for its recommendation algorithm and media player.

Massive community support

Python has a steadily developing community that offers enormous help. From amateurs to specialists, there's everybody. There are a lot of instructional exercises, documentation, and guides accessible for Python web development solutions.

Today, numerous universities start with Python, adding to the quantity of individuals in the community. Frequently, Python designers team up on various tasks and help each other with algorithmic, utilitarian, and application critical thinking.

Progressive applications

Python is the greatest supporter of data science, Machine Learning, and Artificial Intelligence at any enterprise software development company. Its utilization cases in cutting edge applications are the most compelling motivation for its prosperity. Python is the second most well known tool after R for data analytics.

The simplicity of getting sorted out, overseeing, and visualizing information through unique libraries makes it ideal for data based applications. TensorFlow for neural networks and OpenCV for computer vision are two of Python's most well known use cases for Machine learning applications.

Summary

Thinking about the advances in programming and innovation, Python is a YES for an assorted scope of utilizations. Game development, web application development services, GUI advancement, ML and AI improvement, Enterprise and customer applications - every one of them uses Python to its full potential.

The disadvantages of Python web improvement arrangements are regularly disregarded by developers and organizations because of the advantages it gives. They focus on quality over speed and performance over blunders. That is the reason it's a good idea to utilize Python for building the applications of the future.

#python development services #python development company #python app development #python development #python in web development #python software development

August Larson

1624331040

Python For Loop (with Examples)

A Python tutorial to understand the uses of for loop in various ways including examples.

Python is a general-purpose programming language, which emphasizes making programming easy, efficient coding, and unleashes the user’s potential. Loops are the vital part of programming as it allows the user to repetitive use a set of codes using loops. So in the following article, we will see how to use for loops in python.

FOR Loop:

Till the iteration of the last item in the sequence, for loop run the instructions. It iterates over sets of instructions in sequence, arrays, and a tuple for a pre-defined period or until the last item and calculation are executed.

For loop can be categorized in three ways.

Traditional for loop – It is usually used in programming language and contains three parts of a loop, i.e., initialization, condition, increment/decrement.
Iterator/collection-based for loop – It is used for the iteration of objects and collections instead of numbers.
Vectorize for loop – It is used to iterate parallel arrays simultaneously.

#python #for loop #loops #loop #python for loop

Next.JS Developer

1625170860

Python while Loop with Examples

Python is a renowned general-purpose programming language. Unlike HTML or CSS, general-purpose programming languages are used in several application domains.

In programming languages, loops are a set of instructions that execute a sequence of code continuously until a certain condition is fulfilled. Most modern programming languages do include the concept of loops. The syntax for loops in each language may differ but the logic being used remains the same.

Many programming languages have several types of loops and the most renowned ones are while and for loop. Today we will only learn about while loop and where it should be preferred over other kinds of loops.

In most cases loops are interchangeable with each other but while loop should be preferred over other loops when the required condition is boolean. We can think of a while loop as a repeating if statement, to make the concept easier to understand.

#python #loop #while #python while loop with examples #python while loop

Art Lind

1602968400

Python Tricks Every Developer Should Know

Python is awesome, it’s one of the easiest languages with simple and intuitive syntax but wait, have you ever thought that there might ways to write your python code simpler?

In this tutorial, you’re going to learn a variety of Python tricks that you can use to write your Python code in a more readable and efficient way like a pro.

Let’s get started

Swapping value in Python

Instead of creating a temporary variable to hold the value of the one while swapping, you can do this instead

>>> FirstName = "kalebu"
>>> LastName = "Jordan"
>>> FirstName, LastName = LastName, FirstName 
>>> print(FirstName, LastName)
('Jordan', 'kalebu')

#python #python-programming #python3 #python-tutorials #learn-python #python-tips #python-skills #python-development

Art Lind

1602666000

How to Remove all Duplicate Files on your Drive via Python

Today you’re going to learn how to use Python programming in a way that can ultimately save a lot of space on your drive by removing all the duplicates.

Intro

In many situations you may find yourself having duplicates files on your disk and but when it comes to tracking and checking them manually it can tedious.

Heres a solution

Instead of tracking throughout your disk to see if there is a duplicate, you can automate the process using coding, by writing a program to recursively track through the disk and remove all the found duplicates and that’s what this article is about.

But How do we do it?

If we were to read the whole file and then compare it to the rest of the files recursively through the given directory it will take a very long time, then how do we do it?

The answer is hashing, with hashing can generate a given string of letters and numbers which act as the identity of a given file and if we find any other file with the same identity we gonna delete it.

There’s a variety of hashing algorithms out there such as

md5
sha1
sha224, sha256, sha384 and sha512

#python-programming #python-tutorials #learn-python #python-project #python3 #python #python-skills #python-tips