In Python, the plus (+) operator is used for concatenation when used with string data types. When the operator is applied to two strings, it returns a new string that is the concatenation of the two original strings. That’s why '1' + '2' results in '12' and not 3.

Understanding Data Types in Python

In Python, data is stored in variables, which can be of different types. The most commonly used data types are integers (whole numbers), floating-point numbers (decimal numbers), and strings (sequence of characters). In order to perform operations with these data types, Python needs to know what type of data is stored in each variable.

What are Strings in Python

Strings are sequences of characters, and they can be created using either single quotes (') or double quotes ("). For example, 'hello' and "hello" are both valid strings in Python. Strings are used to store text data, such as names, addresses, and other information that is represented in text form.

The Addition Operator with Strings

In Python, the addition operator (+) is used to concatenate two strings. This means that when the addition operator is used with two strings, it creates a new string that is the result of combining the two original strings. For example:

				
					>>> 'hello' + 'world'
'helloworld'

What is Happening with '1' + '2' = '12'

When you add the strings '1' and '2', Python creates a new string that is the result of combining the two original strings. This is why '1' + '2' returns '12'. It is important to remember that when you add strings in Python, you are creating a new string, not performing arithmetic.

Converting Strings to Integers

To perform arithmetic with numbers stored as strings, you must first convert them to integers. This can be done using the int function, which takes a string as its argument and returns the integer representation of that string.

For example:

				
					>>> int('1') + int('2')
3

The Importance of Understanding Data Types

It is crucial to understand the different data types in Python and how they behave to write correct and efficient code. For example, understanding the addition operator’s behavior with strings can help you avoid unexpected results and bugs in your code.

Wrap up

Understanding the behavior of data types and operations in Python is crucial in writing correct and efficient code. For example, when adding strings in Python, the addition operator (+) creates a new string that is the result of combining the two original strings.

If you want to perform arithmetic with numbers stored as strings, you must first convert them to integers using the int function. By taking the time to understand these concepts, you can save yourself from frustration and confusion in the future.


Thanks for reading. Happy coding!