TypeError: unsupported operand type(s) for /: str and int

TypeError: unsupported operand type(s) for /: str and int #

The Python "TypeError: unsupported operand type(s) for /: 'str' and 'int'" occurs when we try to use the division / operator with a string and a number. To solve the error, convert the string to an int or a float, e.g. int(my_str) / my_num.

Here is an example of how the error occurs.

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my_str = '10'

my_num = 5

# ⛔️ TypeError: unsupported operand type(s) for /: 'str' and 'int'
result = my_str / my_num

We are trying to use the division operator with a string and a number.

To solve the error, we have to convert the string to a number (an int or a float).

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my_str = '10'

my_num = 5

result = int(my_str) / my_num

print(result)  # 👉️ 2.0

We used the int() class to convert the string to an integer before using the division operator.

If you have a float wrapped in a string, use the float() class instead.

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my_str = '10'

my_num = 5

result = float(my_str) / my_num

print(result)  # 👉️ 2.0

The division operator / always produces a float, if you need an integer, you can use the floor division operator // instead.

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my_str = '10'

my_num = 5

result = int(my_str) // my_num

print(result)  # 👉️ 2

If you have a string that may also contain characters but you only need to extract an integer, use the filter() function to filter out all non-digits.

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my_str = 'ab 1 cd 0'

my_num_1 = int(''.join(filter(str.isdigit, my_str)))
print(my_num_1)  # 👉️ 10

my_num_2 = 5

result = my_num_1 / my_num_2

print(result)  # 👉️ 2.0

The filter function takes a function and an iterable as arguments and constructs an iterator from the elements of the iterable for which the function returns a truthy value.

The str.isdigit method returns True if all characters in the string are digits and there is at least 1 character, otherwise False is returned.

If you aren't sure what type a variable stores, use the built-in type() class.

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my_str_1 = '10'
print(type(my_str_1))  # 👉️ <class 'str'>
print(isinstance(my_str_1, str))  # 👉️ True

my_int_1 = 2
print(type(my_int_1))  # 👉️ <class 'int'>
print(isinstance(my_int_1, int))  # 👉️ True

The type class returns the type of an object.

The isinstance function returns True if the passed in object is an instance or a subclass of the passed in class.