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# Pythonic Tips & Tricks — Working with Lambda

One of the most interesting aspects of the Python language are Lambda functions. For programmers who are skilled at reducing their codes into simple logical statements, Lambda functions help shrink the number of lines dramatically. In this article we shall go over what Lambda functions are and how to apply them in practical ways in Python.

Let’s begin!

### The Benefits of Lambda

Say you have a function that multiplies any number you put into it by 10.

``````def mult_ten(original):
return original * 10

number = mult_ten(5)
``````

Function Output

The function can actually be written as a literal one-liner. This is achieved through the use of lambda.

``````mult_ten = lambda i : i * 10
print(mult_ten(5))
``````

Exactly the Same Output

But wait, how about more complex functions such as the one below:

``````def mult_int(original, multiplier):
return original * multiplier

number = mult_int(5, 11)
``````

Output of Two Variable Function

#data-science #tips-and-tricks #python #programming

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## Lambda, Map, Filter functions in python

Welcome to my Blog, In this article, we will learn python lambda function, Map function, and filter function.

Lambda function in python: Lambda is a one line anonymous function and lambda takes any number of arguments but can only have one expression and python lambda syntax is

Syntax: x = lambda arguments : expression

Now i will show you some python lambda function examples:

#python #anonymous function python #filter function in python #lambda #lambda python 3 #map python #python filter #python filter lambda #python lambda #python lambda examples #python map

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## 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

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## 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.

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

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## 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

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

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## What Are Python Lambda Functions ?

Learning Python Takes Time

Traveling the road from rookie to Pythonista can take a while and varies from person to person. Most people start learning Python by reviewing the basic data structures for numbers, Booleans and strings, and then move to complex data structures like lists and dictionaries. From there you learn loops and if/else control logic, and eventually learn to write reusable code via functions.

Once you start exploring functions, you’ll come across lambda functions which can seem pretty intimidating at first. Similarly to list comprehensions, lambda functions allow you to write succinct code. Often something that would take several lines as a defined function can be done in one line using a lambda function!

Reviewing Python Functions

Typical Python functions are simply a self-contained set of instructions designed to perform a specific task. They are important to master and understand because they allow us to keep code organized by breaking it into smaller, reusable chunks. If we’re writing a large program, utilizing functions can make the code easier to read and debug too.

In Python, we define a function using the def keyword, then give the function a name along with any necessary arguments that impact the function body’s execution. Often times, the return keyword is used to terminate the function and return the desired output to whatever called the function. Here is an example function:

``````#python example function
def my_function(string):
return print(string) ``````

testing my_function

The example `my_function` takes a string as an argument and prints the string as the returned output.

What Is A Lambda Function?

To take your Python skills to the next level, you need to master both normal functions and lambda functions. Lambda functions are great for making code shorter and more concise, which is the way of the Pythonista! We’ll take a look at a few simple examples to review the syntax, and then look at some actual use cases for lambda functions that will make you look like a pro.

As we see in the previous example, normal functions are defined using `def` and given a name. Lambda functions are defined using the `lambda` keyword and are nameless. They are anonymous functions that are not defined in any namespace, and they are intended for single use.

When I first learned about lambda functions, it seemed a bit tricky to wrap my head around. The syntax can feel confusing since a lambda function can take any number of arguments, but can only have one expression. Here are a couple simple examples:

``````#lambda syntax
#lambda <arguments> : <return expression>#simple example
lambda_example = lambda x: x + x#multiple arguments example
multiple_arguments = lambda x, y, z: (x + y) * z``````

Testing lambda function examples

Notice the multiple arguments are separated by commas. When calling the function, the caller provides the arguments. The return expression is defined after the colon (:). There is a single return expression, but the return expression can be simple or complex. It could even be another function, which makes lambda functions a powerful tool in your Python programming toolbox.

Using Lambda Functions

Let’s take a look at how we can use lambda to write functions the Pythonic way. Below we have a function that checks a list of strings for the word “two.” It returns the list of strings along with True or False depending on whether the word was in the strings:

``````sentences = ['Sentence one.', 'Sentence two.', 'Sentence three.']def contains_two(text):
for s in txt:
if 'two' in s:
else:

Testing contains_two function

Instead of defining a function and using a for loop to go through the list, we can rewrite this succinctly using Python’s map() function along with a lambda function.

``contains_two_lambda = map(lambda x: (True, x) if 'two' in x else (False, x), sentences)``

Testing contains_two_lambda function

The `map()` function takes a function and a sequence as arguments, running the function on the given sequence. The function we pass to map() is a lambda function, allowing us to perform the same thing our defined function does in only one line of code!

Lambda functions work well with functions like map(), reduce(), and filter(), three built-in Python functions that take a function as arguments. Lambda functions are also popular in data munging as they can work well with pandas `dataframes`. They can make applying logical operations to columns and rows concise one-liners.

Using Lambda Functions With Pandas DataFrames

As an analyst, I find myself using Pandas DataFrames all the time. Since DataFames are a popular data structure, let’s take a look at how easy it is to use lambda functions for transforming data in `dataframes`. Let’s create a simple pandas dataframe with some mock data:

``````#import dependencies
import pandas as pd#create dataframe
df = pd.DataFrame({
'Occupation': ['Data Tech','Sales','Analyst','Engineer'],
'Name': ['John Smith', 'Jodie Whales', 'Eric Kleppen', 'Richard Heart'],
'Salary': [50000, 75000, 80000, 100000],
'YearsAtCompany': [2, 3, 1, 3],})``````

Example dataframe

Next, let's create a new column called `newSalary` using a lambda function. If I’m giving out raises based on the column `YearsAtCompany` and want to see what a person’s new salary will be, I can use the `apply()` function similar to how we used `map()` in the previous example:

``````df['newSalary'] =
df['Salary'].apply(lambda x: x * (1 + df['YearsAtCompany']/10))``````

Verifying newSalary column

Notice that the `apply()` function takes the lambda function as an argument and applies the function to each row in the `Salary` column. The expression in the lambda function uses YearsAtCompany to determine the size of the raise.

Wrapping Up

Writing Python like a pro takes practice, so don’t worry if you feel intimidated by new concepts like lambda functions. The syntax looks strange, but lambda functions allow you to write concise, one-time-use functions that are great for applying logical operations.

Although they can only perform one expression, the expression can be complex and even include another function. Lambda functions can work well with series of data, as even data structures like Pandas DataFrames.

This story was originally published at https://betterprogramming.pub/become-a-python-programmer-what-are-lambda-functions-1de065686edf