We have learned about* escape sequences* in the previous tutorial. I hope you have practiced it well. In this tutorial, we are going to learn about

*which is the most core topic of this Python series. That is to say; it’s data type or literals.*

**Python Data Types**You may not have heard of the words literal and data types before if you are new to programming. But don’t worry, we got you covered here! We will cover the following topics in this tutorial –

*What is Literal?**What are Data Types?**Integers in Python**Floats in Python*

*What is Number System in Python?**Decimal Numbers**Binary Numbers**Octal Numbers**Hexadecimal Numbers*

*Key Takeaways**Practice Yourself*

## What is Literal?

* Literals* are some data that can be identified by themselves. In other words, you can think of it as a direct value. For example, if you take a number

**you can quickly recognize it by merely seeing it, whereas the name**

*759*,*can have any value in it.*

**number**That is to say, any data that can be recognized by seeing is known as a * literal*. Some examples of literals are

**151, 7.59, 0.11, “ToolsQA,” etc**We have used double-quotes for the

*.***example, and it is a**

*ToolsQA**. So far, we have mentioned it as a text. From this tutorial onwards, we are going to call it with its actual name, i.e.,*

**string literal***. Moreover, the real number*

**string***is known as*

**7.59, 0.11***. Additionally, we will talk about floats later in this tutorial and strings in the next tutorial.*

**floats**We have already seen how we can pass a literal in print function – *print(“ToolsQA”).*

## What are Data Types?

A specific kind of data item defined by its value is known as * Data Types*.

As we already saw that the values are literals. Moreover, Python divided the literals into four different types of data. Data types are the building blocks for any programming language.

Python Data types are* integers, floats, strings, and booleans*. Additionally, they play a vital role in programming. Therefore, one should possess a strong knowledge of them. In this tutorial, we are going to learn about the

**integers**and

*floats*.

**Python Data Type – Integer**

**Python Data Type – Integer**

The numbers that don’t have any fractional parts are known as * Integers*. Additionally, it can be

*,*

**positive***, or*

**negative***. See the integers number line.*

**zero**Some examples of integers are * 759, -759, 123, 4, -5, etc. *In addition to this, Integers don’t have a fraction part. Let’s see how to represent integers in Python.

We can use the integers directly as we use it generally. In other words, there is no special notation for the integers in Python. Subsequently, let’s try running the following example code.

1 2 3 |
# integers print(759) print(2020) |

The numbers that we passed to * print *statements are

**.**

*integer**literals*You will get the same output as you see in the program.

What if we want to store large numbers like * 123,456,789*? We can’t write as it is. That is to say; Python doesn’t allow us to put commas in between the digits of a number. Let’s see what happens if we write them in the

*statement?***print**

1 2 |
# integers print(123,456,789) |

I think you know the output for the above code. Consequently, run the code and see it whether your output matches the real output or not.

We didn’t get any errors. In other words, the print statement takes them as three different numbers and prints them to the console. But that’s not what we want. We want the entire number as * 123456789*. Let’s explore other ways to write long integers.

Can we write the number as * 123 456 789*? No, it’s not correct, according to Python. So, what do we get as the output for

*? Let’s check it with the following code.*

**123 456 789**
1 2 |
# integers print(123 456 789) |

What’s the correct way then?

We can write it as * 123456789*. We already know that it’s one of the ways. But it is difficult to skim. Therefore, to avoid this, Python has a special notation for long digit integers.

Using * underscore (_) *in place of the

*and*

**comma (,)***in the number, we can achieve the goal. As a result, the number becomes*

**space ( )***. The notation appears in*

**123_456_759***for the first time. Write the following code in the IDE and run it.*

**Python 3.6**
1 2 |
# integer with underscore print(123_456_759) |

We got the correct output. In other words, it’s just a notation to represent large numbers. It’s your choice to use it or not. Therefore, using underscore to divide the parts of a large number is a good practice.

**How to represent negative integers?**

**How to represent negative integers?**

Use the ** hyphen (-) **before the number to make it a negative number. In other words, everything else is similar to a positive number. If we don’t put a

**before a number, then Python considers it as a positive integer. Let’s see the addition example with negative integers.**

*hyphen (-)*
1 2 3 |
# negative integers print(-759) print(-123_456_789) |

As shown above, we are printing the negative integers.

**int() function**

**int() function**

The function * int() *helps to convert a string or float into an integer. Additionally, the function

*takes an optional argument. Therefore, if we don’t pass anything to the*

**int(argument)****function, then it returns a zero.**

*int()*Let’s see some examples of the conversion of other data types into an integer.

1. If you pass a string literal that contains integer digits, then the **int(string)** will return the string of digits as an integer. Consequently, let’s write the following code in your IDE and run it.

1 2 |
# converting string literal to integer print(int("123")) |

So how do we know that the 123 output is an integer now and not a string? Try this on your own – print (int(“123”) +1 ) What did you get? If you get 124, that means String “123” converts to an integer 123, and hence you can do an operation of addition on it!

2. What if you pass a text like * ToolsQA2019*? Can the

**convert it into an integer without any errors? Guess it. I think most of you feel that it’s not possible because of the alphabets present in the string literal. And it’s true. That is to say, the function**

*int()***is not able to convert the string**

*int()***into an integer.**

*ToolsQA2019***It throws a**

**ValueError**.It doesn’t understand the text with characters other than digits. As a result, the function * int()* throws an error. See the failure by running the following code in IDE.

1 2 |
# converting string literal to integer print(int("ToolsQA2019")) |

3. If you pass * float *to the

**function, it returns the integer part of the**

*int()**In other words, say you pass the value*

**float**.*to the*

**7.59***function. As a result, it returns the integer part, i.e.,*

**int()****7**. Follow the below code for hands-on experience.

1 2 |
# converting string literal to integer print(int(7.59)) |

What happens when we don’t pass any parameter? Try print(int()) on your own. Consequently, you will get 0 as output.

**Python Data Type – Floats**

**Python Data Type – Floats**

Floats contain values with fractional parts. Additionally, it has values both before and after the decimal point. Moreover, they have a unique name in programming called ** floating-point **numbers.

Examples of floating-point numbers are **7.59, -95.7, .7, 7., etc.**

We can write the ** 7.0 **as

**7****and**

*.**as*

**0.7***. In other words, we can delete the zero if it is the only digit in the integer or fractional part of the floating-point number.*

**.7**Open the IDE and write the following code.

1 2 |
# floating-point numbers print(7.59) |

As shown above, we are printing the floating-point number.

Try to print different floating-point numbers to see the behavior of the floats in Python.

**Scientific Notation**

**Scientific Notation**

If the floating-point values are huge numbers, then we will use ** scientific notation **to represent them. In other words, we have to use the alphabet

*or*

**e***in the scientific notation.*

**E**If you see the number * 7590000000000.0,* it is complicated to type all the zeroes. In other words, instead of typing all the zeroes, we can represent it as

**which is**

*759 x 10*^{10,}*in scientific notation.*

**759E10**
1 |
7590000000000.0 = 759x10<sup>10</sup> = 759E10 |

In scientific notation, the part after the ** E **must be an integer. In addition to this, before part of the

**may be integer or float. Let’s see some examples.**

*E**7.59 x 10*^{-25}= 7.59e-25*0.000007 = 7 x 10*^{-6}= 7E-6

Whenever we use ** E **or

**to represent a number, then it is a floating-point number in Python.**

*e***Let’s do some practice**

1 2 |
# floating-point numbers print(0.000007) |

As shown above, Python chooses the appropriate notation to display the floating-point numbers based on the value.

Therefore, Python smartly chooses to represent the output in scientific notation.

Let’s see what happens if we directly print the scientific notation.

In this case, the argument was already in scientific notation, so no need for Python to make any changes.

*float() function*

*float() function*

The ** float() **function works similar to the

*function. That is to say, it takes an object as an argument and returns the value as a float-point value.*

**int()****Run all the examples from the**

*section using*

**int()****function. See the code examples for the conversion in the code below.**

*float()*
1 2 3 4 5 6 |
# converting to float print(float("123.0")) print(float(759)) print(float(7.59)) |

If we have given a string with characters other than digits to the * float()* function, it will throw an error similar to the

**function.**

*int()*

## What is the Number system in Python?

We have different types of number systems in programming languages. Moreover, the integers that we have learned are from the * decimal number system*. Let’s see the other number systems.

We have a total of 4 number systems. They are :

**Decimal****Binary****Octal****Hexadecimal**

For any number system, we will have a range of digits.

Additionally, we calculate it on the * base* of the number system.

*For example, the*

**base**

*of the binary number system is*

**2**

*. The digits range is*

**0 – 1**

*. So, in any number system, the digits range is*

**0 to (base – 1)**

*.*Let’s learn about the different number systems in detail.

**Note**:- **print **function converts any number into the **decimal **number system by default.

**Decimal Number**

**Decimal Number**

We use the ** Decimal **number system in our daily life. Moreover, they are

**in programming. The**

*Integers***of decimal numbers is**

*base**. The range of digits present in the decimal number system is*

**10***. In addition to this, the function designed for the decimal number is*

**0 – 9***. We have learned it in the previous section, refer to that. Let’s see the expansion for a decimal number.*

**int()**Take a number * 16*, it can be expanded as

*. Here,*

**1 * 10**^{1 }+ 6 * 10^{0}**is the base of the decimal number system. Additionally,**

*10*

**1, 6****are the digits of the number**

*. You expand any number*

**16****using the corresponding base of the number system. Let’s see the remaining number of systems using the same example.**

**Binary Numbers**

**Binary Numbers**

Binary means two. The base of the ** Binary **number system is

*. So, the range of the binary number system is*

**2****In other words, it consists of 2 digits**

*0 – 1*.*and*

**0****1**. As we all know, computers use the

**and**

*1’s***to represent the data internally. That is to say; they use the**

*0’s**number system.*

**Binary**

**How to represent binary numbers in Python?**

**How to represent binary numbers in Python?**

In Python, we will have to start a number with * 0b (zero-b)* or

*to represent a binary number. For example, the number*

**0B (zero-B)****represents**

*2**in binary notation.*

**0b10**We have to use a function called ** bin() **to convert any number to a binary number. In other words, if we pass

*to the*

**16****function, then it will return the binary representation of**

*bin()**i.e.,*

**16,***. Let’s see it practically.*

**0b10000**
1 2 |
# decimal to binary print(bin(16)) |

The binary representation of * 16 *is

*that can expand as*

**10000***. You can get the decimal number by computing the expansion of any number. Try it with*

**1 * 2**^{4}+ 0 * 2^{3}+ 0 * 2^{2}+ 0 * 2^{1}+ 0 * 2^{0}*, you will get*

**1111****as decimal number.**

*15*

**Octal Numbers**

**Octal Numbers**

We have to use the prefix * 0o (zero-o)* or

*to represent octal numbers in Python. Similar to the decimal and binary numbers, the*

**0O (zero-O)****number system also has the**

*octal***i.e.,**

*base*,*. In other words, the digits range in the octal number system is from*

**8****to**

*0**. Moreover, for octal numbers, we have a function called*

**7***. It works similar to the*

**oct()****and**

*int()***functions. Let’s see the example.**

*bin()*
1 2 |
# decimal to octal print(oct(16)) |

We can expand the octal number * 20 *as

**which is equal to**

*2 * 8*^{1}+ 0 * 8^{0,}**in the decimal number system.**

*16*

**Hexadecimal Numbers**

**Hexadecimal Numbers**

The prefix used for the representation of ** hexadecimal **numbers in Python is

**0x****or**

*(zero-x)**. Moreover, the base for hexadecimal numbers is*

**0X (zero-X)***. So, the range of the number in the hexadecimal number system is*

**16***. But, there is one thing that we have to learn about the hexadecimal numbers that are not in previous number systems. Let’s see what it is.*

**0 – 15**One can represent the numbers in any number system using the normal digits. But in the hexadecimal number system, we have to represent the number from ** 10 – 15 **as

*or*

**A – F****respectively. See the list of numbers that has to represented using the alphabets.**

*(a – f)*,

Number |
Hexadecimal Representation |

10 | A or a |

11 | B or b |

12 | C or c |

13 | D or d |

14 | E or e |

15 | F or f |

Similar to the other number systems, hexadecimal also has a function to work with them in Python. Additionally, the function is * hex()*. It works similar to the

*int()*,**and**

*bin()*,*. Let’s see the examples.*

**oct()**
1 2 |
# decimal to hexadecimal print(hex(16)) |

The expansion of the hexadecimal number * 10* is

**1 * 16**^{1}+ 0 * 16^{0 }= 16**Note**:- We can pass any number system member to the functions **int(), bin(), oct(), **and **hex()**. That is to say, the number that we gave to the function will convert to the respective number system member.

Let’s have a quick look at different examples. Run the following code in your IDE

1 2 3 4 |
# binary, octal, hexadecimal to int print(int(0b10)) print(int(0o12)) print(int(0x19)) |

1 2 3 4 |
# int, octal, hexadecimal to binary print(bin(2)) print(bin(0o12)) print(bin(0x19)) |

1 2 3 4 |
# int, binary, hexadecimal to octal print(oct(12)) print(oct(0b11010)) print(oct(0x19)) |

1 2 3 4 |
# int, binary, octal to hexadecimal print(hex(12)) print(hex(0b11010)) print(hex(0o17)) |

Now that we have covered so much ground let’s revisit the int() function quickly again. We have seen that print(int(“123”)) gives 123 as output. So the int function by default converts the string to the decimal number system. However, we can also define this as **int(String, base)**

So if you give int(“101”, 2), it will take the string in binary format and give the corresponding decimal result.

*print( int(“101”,2)) = 5*

*print( int(“101”,8)) = 65*

*print( int(“101”,16)) = 257*

*print( int(“101”,10)) = 101* (specifying base 10 is optional, so even if you write it without base, you will still get decimal base.

Till now, we have seen integers and different number systems. Now, let’s see the numbers with a fractional part.

## Key Takeaways

*A literal is a data that can be identified by itself. Moreover, these are fixed values. For example, 7, 7.59, “ToolsQA”, ‘ToolsQA’, etc.**Additionally, we can output the***literals**directly using the**print()**function.*A particular kind of data item from the literals is known as a***data type**.*There are different types of data. We have seen***integer**and**float**data types in this tutorial. That is to say,**7**is an integer, whereas**7.59**is a float data type.*In addition to the above, there are different***number systems**in Python. A Binary number system has two as it’s base, and it’s represented by**0b**– E.g., 0b1010. Similarly, the other number systems are**octal**,**decimal**, and**hexadecimal**. And their bases are**8**,**10**, and**16,**respectively. Examples:**0o20**,**16**, and**0x10**.*Moreover, we can use***bin()**,**oct()**,**int()**, and**hex()**function for the conversion of numbers from one number system to another number system.*Small and Large numbers can be represented using***scientific notation**. Example:**0.000000759**=>**7.59e-07**and**75900000000000000.0 => 7.59e+16**.*In addition to above,***int()**and**float()**functions convert other data types into respective data types into int and float data types.

## Practice Yourself

1 2 3 |
<em><strong>#Problem 1</strong></em> print(2020, 000.202000) print(2020, .202) |

1 2 |
<em><strong>#Problem 2</strong></em> print(int(23.99)) |

1 2 |
<em><strong>#Problem 3</strong></em> print(float(2)) |

1 2 3 4 5 |
<em><strong>#Problem 4</strong></em> print(bin(21)) print(oct(21)) print(int(21)) print(hex(21)) |

1 2 3 4 |
<em><strong>#Problem 5</strong></em> print(0B11001) print(0O31) print(0X19) |

1 2 |
<em><strong>#Problem 6</strong></em> print(int(111, base=2)) # If you get an error, then try below |

1 2 |
<em><strong>#Problem 7</strong></em> print(int("111", base=2)) |

## What Next?

Conclusively, that’s the end of the tutorial. We have covered a lot of ground here, but the key for you is to practice all the examples.

Moreover, it was just half the fun for python literals. In our next tutorial, we will learn about * boolean and String data types*.

Happy Coding!