Python - unsupported operand type(s) for +:'int' and 'str'

In this tutorial, we are going to learn about how to solve the TypeError: unsupported operand type(s) for +:‘int’ and ‘str’ in Python

When we try to concatenate the integer and a string, we will get the TypeError: unsupported operand type(s) for +:‘int’ and ‘str’, because in python language we only concatenate if both values belong to the same data type.

Here is an example of how the error occurs:

price = 10  # integer
txt = ' dollars in the apple price' # string

result = price + txt
print (result)

Output:

Traceback (most recent call last):
  File "main.py", line 13, in <module>
    result = price + txt
TypeError: unsupported operand type(s) for +: 'int' and 'str'

In the example above, we are concatenating the integer and string using + plus operator but both are different data types.So it throws the error in terminal.

To solve the error, convert the integer value to a string using str() function then concatenate it using + operator.

The str() function takes the integer value as a argument and converts it to the string.

Here is an example:

price = 10  # integer
txt = ' dollars is the apple price' # string

result = str(price) + txt
print (result)

Output:

'10 dollars is the apple price'

We can also check what type of data that a variable holds, using the type() function in Python.

price = 10  # integer

print(type(price)) # <class 'int'>

The type() function returns the type of a data object.

Conclusion

The “unsupported operand type(s) for +:‘int’ and ‘str’"" error occurs, when we try to concatenate the integer and string. To solve the error, convert the integer to a string using the str() function then add it to the string.