Python Tips and Tricks

Python is one of the most loved programming languages. Wanna know why it is so popular? Here I’ll show you 7 python tips and tricks used by many developers when writing code. My name is Husnain and I’m a Software Engineer who smokes Python everyday. 

 

#1

Want to swap two numbers? 

Here how you will do In any programming language

 

var a = 10;

var b = 20;

var tmp = a;

a = b;

b = tmp ;

 

This is how you do this in python

 

a = 10

b = 20

 

a,b = b,a

 

Cleaaaaannnn Right? 

 

#2

 

Let’s say you want to write a sentence n number of times

 

This is how you do in other programming languages

 

for(var i = 0; i<n; i++)

print(‘post4everyone’);

 

This is how you do this in python 

 

print(‘post4everyone’ * n)

 

#3 

 

If you want to check if the element is in a list or not

 

This is how you do in other programming languages

 

function validate(collection, x){

for (var el in collection){

if (el == x)

return true

return false

}

}

This is how you do this in python 

 

def validate(collection, x)

return x in collection

 

Lit right? 

 

#4

Lets say you want to assign first and last members of a list to other variables and the middle part to another

 

This is how you do in other languages

 

lst = ["A", "B", "C", "D", "E"]

a = lst[0]

c = lst[lst.length - 1]

 

b = Array()

for(var i = 1; i < lst.size - 1; i++)

b += lst[i]

 

This is how you do this in python.

 

lst = ["A", "B", "C", "D", "E"]

a, *b, c = lst

 

Now this is beauty

 

#5 

 

Do you want to reverse a list? 

 

This is how you do in other programming languages

 

function reversList(original){

var rev = new Array;

    for(var i = original.length-1; i >= 0; i--) {

        rev.push(input[i]);

    }

    return rev;

 

}

 

This is how you do this in python 

 

def reversList(original):

return reverse(original)

 

Yes python has a built in reverse method. 

 

Wanna know another way to reverse list? 

 

def reversList(original):

return original[::-1]

 

Didn’t understand this? See the next point

 

#6

Python comes with a pretty cool feature which no other programming language has. One of them is list slicing.

 

Let’s say you want to slice a list from 2nd element to 5th this is how you do in other programming languages

 

var lst = [1,2,3,4,5,6,7,8,9];

 

x = Array();

for(var i = 2; i < 6; i++)

x += lst[i];

 

This is how you do this in python

 

lst = [1,2,3,4,5,6,7,8,9]

x = lst[2:6]

 

So we are asking python to assign the members between 2nd and 6th index (the last index is not inclusive)

 

#7 

 

List comprehensions is the single most powerful and most loved feature of python. I wish every programming language have this one for sure. 

 

Let’s say you want to filter out only even numbers from a list, this is how you do in other programming languages

 

function getEven(numbers){

even = Array();

for(var num in numbers){

if (num % 2 == 0)

Even += num;

}

return even;

}

 

This is how you do in python

 

def getEven(numbers):

return [num for num in numbers if num %2 == 0]

 

Posted: 19 Dec 2020