Python Type Conversion and Type Casting

By | August 17, 2021
Python Type Conversion & Type Casting

In this Python tutorial, we will discuss the Python type conversion and what are its uses. Before proceeding, however, ensure that you have good knowledge of Python data types. Now, let’s discuss Python type conversion & type casting.

Python Type Conversion & Type Casting

Type Conversion

Python is a dynamically typed language, which means that you do not need to specify the type of data that you are assigning to a variable. The python interpreter will itself understand the type of variable and assign a data type accordingly.

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In Python, nonetheless, you get the feature by which you can convert the type of data. This is called type conversion. It is a method or process of converting one data type to another. That could be any data type, integer, float, string, list or dictionary. There are 2 types of type conversion in Python:

  1. Implicit Type Conversion
  2. Explicit Type conversion

We will discuss each of them in detail below.

1. Implicit Type Conversion

When the Python interpreter itself converts the data type of a variable it is known as implicit data conversion. Let’s understand it with an example.

Suppose that you have 2 variables, var_int and var2_float, where var_int is an integer data type and var_float is a float data type. Consequently, when you apply a division or subtraction or multiplication or addition operation on them, you will get a float value. This is because of the implicit type conversion in Python.

Code Example:

var_int =10                                          #it is an integer
var_float=10.0                                   #it is a float
print("The type of var_int is", type(var_int))
print("The type of var_float is ", type(var_float))
 
add_vars = var_float + var_int                    #new data type add_vars will be float not int
print("The value of add_vars is ", add_vars, "and its type is ",type(add_vars))

Output

The type of var_int is <class 'int'>
The type of var_float is  <class 'float'>
The value of add_vars is  20.0 and its type is  <class 'float'>

What if We Apply the + Operator On an Integer and String?

An interesting thing happens when we apply the + operator on two variables, one of which is an integer type and the other is of string type. If we apply the + operator on an integer and string we will get a TypeError. Let’s understand it with an example.

Code Example:

var_int = 69
var_string = "69"                               # it is an string because 69 is between the " "
print("The data type of var_int is ", type(var_int))
print("The data type of var_string is ", type(var_string))
print( var_string + var_int)           #here we are adding and a string 69 with an integer 69

Output

The data type of var_int is  <class 'int'>
The data type of var_string is  <class 'str'>
Traceback (most recent call last):
File "importt.py", line 7, in <module>
print( var_string + var_int)
TypeError: can only concatenate str (not "int") to str

2. Explicit Type Conversion (a.k.a. Type Casting)

There are pre-defined functions in the python, such as str(), int(), float(), list(), dict(), set(), and tuple() that are used to convert one type of data into another. In explicit data type conversion, you use these functions to convert the data type of variables.

Explicit conversion of Data-types with examples:

var_int = 144
var_float = 144.0
var_str_int = "69"
print("Type of var_int is ", type(var_int))
print("Type of var_float is ", type(var_float))
print("Type of var_str_int is ", type(var_str_int))

Explicit Type Conversion

print("var_int converted into string ", str(var_int) )
print("var_int converted into Float ", float(var_int))
print("var_float converted into integer", int(var_float))
print("var_float converted into str", str(var_float))
print("var_str_int converted into integer", int(var_str_int))
print("var_str_int converted into float", float(var_str_int))
print("var_str_int converted into list", list(var_str_int))
</pre.

Output

Type of var_int is  <class 'int'>
Type of var_float is  <class 'float'>
Type of var_str_int is  <class 'str'>
var_int converted into string  144
var_int converted into Float  144.0
var_float converted into integer 144
var_float converted into str 144.0
var_str_int converted into integer 69
var_str_int converted into float 69.0
var_str_int converted into list ['6', '9']

Important Points to Remember in Python Type Conversion & Type Casting

  • Using type conversion, you can convert a data type to another data type.
  • In explicit type conversion, you can only convert those string values to integer or float values that contain only digits.
  • Another name for explicit type conversion is type casting.

Conclusion

That was all about Python type conversion & type casting. For the most part, implicit type conversion will do the job.  If you, however, need to manually convert data types of variables, you can also do so using built-in type conversion functions.

Python Tutorials:

Introduction

Flow Control

Functions

Datatypes

File Handling

Object & Class

Additional Tutorials

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