A Python variable is a reserved memory location to store values. In other words, a variable in a python program gives data to the computer for processing.
Every value in Python has a datatype. Different data types in Python are Numbers, List, Tuple, Strings, Dictionary, etc. Variables can be declared by any name or even alphabets like a, aa, abc, etc.
In this tutorial, we will learn,
Let see an example. We will declare variable “a” and print it.
a=100 print (a)
You can re-declare the variable even after you have declared it once.
Here we have variable initialized to f=0.
Later, we re-assign the variable f to value “guru99”
Python 2 Example
# Declare a variable and initialize it f = 0 print f # re-declaring the variable works f = 'guru99' print f
Python 3 Example
# Declare a variable and initialize it f = 0 print(f) # re-declaring the variable works f = 'guru99' print(f)
Let’s see whether you can concatenate different data types like string and number together. For example, we will concatenate “Guru” with the number “99”.
Unlike Java, which concatenates number with string without declaring number as string, Python requires declaring the number as string otherwise it will show a TypeError
For the following code, you will get undefined output -
a="Guru" b = 99 print a+b
Once the integer is declared as string, it can concatenate both “Guru” + str(“99”)= “Guru99” in the output.
a="Guru" b = 99 print(a+str(b))
In Python when you want to use the same variable for rest of your program or module you declare it a global variable, while if you want to use the variable in a specific function or method, you use a local variable.
Let’s understand this difference between local and global variable with the below program.
Python 2 Example
# Declare a variable and initialize it f = 101 print f # Global vs. local variables in functions def someFunction(): # global f f = 'I am learning Python' print f someFunction() print f
Python 3 Example
# Declare a variable and initialize it f = 101 print(f) # Global vs. local variables in functions def someFunction(): # global f f = 'I am learning Python' print(f) someFunction() print(f)
Using the keyword global, you can reference the global variable inside a function.
Python 2 Example
f = 101; print f # Global vs.local variables in functions def someFunction(): global f print f f = "changing global variable" someFunction() print f
Python 3 Example
f = 101; print(f) # Global vs.local variables in functions def someFunction(): global f print(f) f = "changing global variable" someFunction() print(f)
You can also delete variable using the command del “variable name”.
In the example below, we deleted variable f, and when we proceed to print it, we get error “variable name is not defined” which means you have deleted the variable.
f = 11; print(f) del f print(f)
Python Tutorial for Absolute Beginners - What Are Variables?
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Welcome to my Blog , In this article, you are going to learn the top 10 python tips and tricks.
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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:
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At the end of 2019, Python is one of the fastest-growing programming languages. More than 10% of developers have opted for Python development.
In the programming world, Data types play an important role. Each Variable is stored in different data types and responsible for various functions. Python had two different objects, and They are mutable and immutable objects.
Table of Contents hide
III Built-in data types in Python
The Size and declared value and its sequence of the object can able to be modified called mutable objects.
Mutable Data Types are list, dict, set, byte array
The Size and declared value and its sequence of the object can able to be modified.
Immutable data types are int, float, complex, String, tuples, bytes, and frozen sets.
id() and type() is used to know the Identity and data type of the object
a**=str(“Hello python world”)****#str**
Numbers are stored in numeric Types. when a number is assigned to a variable, Python creates Number objects.
Python supports 3 types of numeric data.
int (signed integers like 20, 2, 225, etc.)
float (float is used to store floating-point numbers like 9.8, 3.1444, 89.52, etc.)
complex (complex numbers like 8.94j, 4.0 + 7.3j, etc.)
A complex number contains an ordered pair, i.e., a + ib where a and b denote the real and imaginary parts respectively).
The string can be represented as the sequence of characters in the quotation marks. In python, to define strings we can use single, double, or triple quotes.
# String Handling
#single (') Quoted String
# Double (") Quoted String
# triple (‘’') (“”") Quoted String
In python, string handling is a straightforward task, and python provides various built-in functions and operators for representing strings.
The operator “+” is used to concatenate strings and “*” is used to repeat the string.
'Output : Python python ’
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This blog is part of a series of tutorials called Data in Day. Follow these tutorials to create your first end-to-end data science project in just one day. This is a fun easy project that will teach you the basics of setting up your computer for a data science project and introduce you to some of the most popular tools available. It is a great way to get acquainted with the data science workflow.
Created by Dutch programmer Guido van Rossum at Centrum Wiskunde & Informatica, Python made its debut in 1991. Over thirty years it has gained popularity earned a reputation of being the “Swiss army knife of programming languages.” Here are a few reasons why:
In emerging fields like data science, artificial intelligence, and machine learning, a robust community, plenty of packages, paradigm flexibility, and syntactical simplicity, allow beginners and professionals to focus on insights and innovation.
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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.
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')
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