ZeroDivisionError: float division by zero in Python [Fixed]

Borislav Hadzhiev

Last updated: Feb 16, 2023

Reading timeยท6 min

- ZeroDivisionError: float division by zero in Python
- ZeroDivisionError: integer modulo by zero
- ZeroDivisionError: division by zero in Python

**The Python "ZeroDivisionError: float division by zero" occurs when we try to
divide a floating-point number by 0.**

**To solve the error, use an if statement to check if the number you are
dividing by is not zero, or handle the error in a try/except block.**

Here is an example of how the error occurs.

main.py

`a = 15.0 b = 0 # โ๏ธ ZeroDivisionError: float division by zero result = a / b`

It's unclear what value is expected when we divide by `0`

, so Python throws an
error.

When we divide a number by `0`

, the result tends towards infinity.

One way to solve the error is to check if the value we are dividing by is not
`0`

.

main.py

`a = 15.0 b = 0 if b != 0: result = a / b else: result = 0 print(result) # ๐๏ธ 0`

We check if the `b`

variable doesn't store a `0`

value and if it doesn't, we
divide `a`

by `b`

.

Otherwise, we set the

`result`

variable to `0`

. Note that this could be any other value that suits your use case.If setting the `result`

variable to `0`

if `b`

is equal to `0`

suits your use
case, you can shorten this to a single line.

main.py

`a = 15.0 b = 0 result = b and a / b print(result) # ๐๏ธ 0`

The expression `x and y`

first evaluates `x`

, and if `x`

is falsy, its value is
returned, otherwise, `y`

is returned.

Since

`0`

is a falsy value, it gets returned if the `b`

variable in the example stores a `0`

value, otherwise, the result of dividing `a`

by `b`

is returned.`try/except`

statement to handle the errorAlternatively, you can use a `try/except`

statement.

main.py

`a = 15.0 b = 0 try: result = a / b except ZeroDivisionError: result = 0 print(result) # ๐๏ธ 0`

We try to divide `a`

by `b`

and if we get a `ZeroDivisionError`

, the `except`

block sets the `result`

variable to `0`

.

`0`

The best way to solve the error is to figure out where the variable gets
assigned a `0`

and check whether that's the expected behavior.

Here are some common ways you might get a zero value unexpectedly.

main.py

`print(int()) # ๐๏ธ 0 print(int(0.9)) # ๐๏ธ 0`

You might also get a zero value if you multiply any number by `0`

.

main.py

`num_1 = 5 num_2 = num_1 * 0 print(num_2) # ๐๏ธ 0`

Make sure you haven't assigned the result of multiplying a number by `0`

to a
variable.

`try/except`

statementIf you need to take a number from user input, use a `try/except`

statement to
handle the potential `ZeroDivisionError`

.

main.py

`num_1 = 15.0 try: num_2 = int(input('Enter a number: ')) result = num_1 / num_2 print(f'The result of the division is: {result}') except (ZeroDivisionError, ValueError): print('Specify a positive integer value')`

If the user passes an invalid integer, a `ValueError`

is raised and is then
handled by the `except`

block.

Similarly, if the user enters `0`

, a `ZeroDivisionError`

is raised and is
handled by the `except`

block.

Otherwise, the result of the division gets printed in the `try`

block.

**The Python "ZeroDivisionError: integer division or modulo by zero" occurs when
we use the modulo % operator with an integer and a zero.**

**To solve the error, figure out where the 0 comes from and correct the
assignment.**

Here is an example of how the error occurs.

main.py

`a = 6 b = 0 # โ๏ธ ZeroDivisionError: integer division or modulo by zero # ZeroDivisionError: integer modulo by zero result = a % b`

We tried using the modulo `%`

operator with a zero.

It's unclear what value is expected when we divide by `0`

, so Python throws an
error.

When we divide a number by `0`

, the result tends towards infinity.

The best way to solve the error is to figure out where the `0`

value comes from
and correct the assignment.

Here are some unexpected sources of `0`

.

main.py

`import random print(int()) # ๐๏ธ 0 print(int(0.9)) # ๐๏ธ 0 print(random.randint(0, 10)) # ๐๏ธ 0 print(list(range(0, 5))) # ๐๏ธ [0, 1, 2, 3, 4]`

If you use the `random.randint()`

method or the `range()`

class, make sure to
start from `1`

, and not from `0`

.

main.py

`import random print(random.randint(1, 10)) # ๐๏ธ 4 # ๐๏ธ [1, 2, 3, 4] print(list(range(1, 5)))`

`0`

before using moduloYou can also conditionally check if the variable doesn't store a `0`

value
before using the modulo operator.

main.py

`a = 6 b = 0 if b != 0: result = a % b else: # ๐๏ธ this runs print('b is equal to 0')`

The `if`

statement checks if the `b`

variable doesn't store a `0`

value before
using the modulo `%`

operator.

`try/except`

statement to handle the errorAlternatively, you can use a try/except statement.

main.py

`a = 6 b = 0 try: result = a % b print(result) except ZeroDivisionError: pass`

We use the modulo operator and if we get a `ZeroDivisionError`

, the `except`

block is run.

You can set the `result`

variable to a value that suits your use case in the
`except`

block or simply pass.

The modulo (%) operator returns the remainder from the division of the first value by the second.

main.py

`print(10 % 2) # ๐๏ธ 0 print(10 % 4) # ๐๏ธ 2`

If the value on the right-hand side is zero, the operator raises a
`ZeroDivisionError`

exception.

The left and right-hand side values may also be floating point numbers.

If the left-hand side value is a float and the right-hand side value is `0`

, you
would get a "ZeroDivisionError: float modulo" error.

main.py

`# โ๏ธ ZeroDivisionError: float modulo print(10.5 % 0) # ๐๏ธ 0`

**The Python "ZeroDivisionError: division by zero" occurs when we try to divide
a number by 0.**

**To solve the error, use an if statement to check if the number you are
dividing by is not zero, or handle the error in a try/except block.**

Here is an example of how the error occurs.

main.py

`a = 5 b = 0 # โ๏ธ ZeroDivisionError: division by zero result = a / b`

It's unclear what value is expected when we divide by `0`

, so Python throws an
error.

When we divide a number by `0`

, the result tends towards infinity.

One way to solve the error is to check if the value we are dividing by is not
`0`

.

main.py

`a = 5 b = 0 if b != 0: result = a / b else: result = 0 print(result) # ๐๏ธ 0`

We check if the `b`

variable doesn't store a `0`

value and if it doesn't, we
divide `a`

by `b`

.

Otherwise, we set the

`result`

variable to `0`

. Note that this could be any other value that suits your use case.If setting the `result`

variable to `0`

, if `b`

is equal to `0`

suits your use
case, you can shorten this to a single line.

main.py

`a = 5 b = 0 result = b and a / b print(result) # ๐๏ธ 0`

The expression `x and y`

first evaluates `x`

, and if `x`

is falsy, its value is
returned, otherwise, `y`

is returned.

Since

`0`

is a falsy value, it gets returned if the `b`

variable in the example stores a `0`

value, otherwise the result of dividing `a`

by `b`

is returned.`try/except`

statement to handle the errorAlternatively, you can use a `try/except`

statement.

main.py

`a = 5 b = 0 try: result = a / b except ZeroDivisionError: result = 0 print(result) # ๐๏ธ 0`

The `try/except`

block is known as "asking for forgiveness, rather than
permission".

We try to divide `a`

by `b`

and if we get a `ZeroDivisionError`

, the `except`

block sets the `result`

variable to `0`

.

The best way to solve the error is to figure out where the variable gets
assigned a `0`

and check whether that's the expected behavior.

Here are some common ways you might get a zero value unexpectedly.

main.py

`print(int()) # ๐๏ธ 0 print(int(0.9)) # ๐๏ธ 0`

You might also get a zero value by multiplying a number by `0`

.

I've also written an article on how to check if a number is divisible by another number.

You can learn more about the related topics by checking out the following tutorials: