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How to do the modulo operator in Python?

alphonsio

In Python, the modulo operation can be performed using the `%`

operator.

`remainder = dividend % divisor`

This operator returns the remainder of the division of one number by another. The syntax for the modulo operation is:

`remainder = dividend % divisor`

Here's a simple example:

```
a = 10
b = 3
remainder = a % b
print(remainder) # Output will be 1
```

In this case, `10 % 3`

equals `1`

because 10 divided by 3 is 3 with a remainder of 1.

**Checking Even or Odd Numbers**:

```
number = 10
if number % 2 == 0:
print("Even")
else:
print("Odd")
```

**Cycling Through Values**:

```
days_of_week = ["Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"]
day_index = 10 % 7
print(days_of_week[day_index]) # Output will be "Wednesday"
```

**Looping with Step**:

```
for i in range(1, 21):
if i % 5 == 0:
print(f"{i} is a multiple of 5")
```

Here are some additional points about the modulo operation:

- The modulo operator can also work with negative numbers.

```
-10 % 3 # Output will be 2
10 % -3 # Output will be -2
```

- For floating-point numbers:

`5.5 % 1.5 # Output will be 0.5`

**Divisor is Zero**:

Attempting to use zero as the divisor will raise a`ZeroDivisionError`

:

```
>>> 5 % 0
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
ZeroDivisionError: integer division or modulo by zero
```

**Handling Large Numbers**:

The`%`

operator is efficient and can handle very large numbers since Python supports arbitrary-precision integers.

Understanding modulo can be particularly useful for solving problems related to cyclic phenomena, patterns, or conditional evaluations across a finite set of possibilities.