 # Python 3.9 Built In Math Functions

In this post, we will learn about the built-in math functions of Python.

Do you know that in Python you can use some built-in functions of Python without using the Math module?

If you do not know, after reading this Python Math built-in function tutorial, you will know and will also learn how to use Python’s in-built function.

First of all, let us know how many built-in math functions are functions in Python that can be used to perform a mathematical operation.

You can see in the list below how many built-in math functions/methods of Python are there:

## Python math built-in functions

In the list given above, you have seen how many in-built math functions/methods are in Python.

Now we will tell you about every python built-in method/function of the above-given list in detail and also take an example to understand you better.

### Round method in Python

In Python, the round method rounded off the given number. If you have not specified how many decimals points to rounding off given number then it rounds the given number in the integer.

#### Syntax

round(number, digits)

#### Example: python round method

```x = round(5.5)
print(x)

x = round(6.76543, 2)
print(x)
```

Output

```6
6.77 ```

### Pow method in python

In python, pow () methods are used to extract the power of a number.Such as x power y (xy).

pow(x, y, z)

#### Example: pow example python

Let us see Python’s built-in pow () method with an example:

```x = pow(2, 3)
print(x)
```

### Abs method in python

One more great in-built method is available in Python. In Python, the ABS () method is used when the absolute value of a given number is to be found.

abs(n)

#### Example: ABS method in python

```x = abs(-5.50)
print(x)
```

Output

`5.50`

### Min method in python

In Python, the min() method is used when the smallest value is to be obtained from a list or a given input list.

#### Syntax

min(n1, n2, n3, …)

#### Example: python get min of list

```x = min(5, 10, 15, 25, 35, 45, 55) # list of items

print(x) // output
```

Output

`5`

### Max method in python

In Python, the max() method is used when the largest value is to be obtained from a list or a given input list.

#### Syntax

max(n1, n2, n3, …)

#### Example: python get max of list

```x = max(5, 10, 15, 25, 35, 45, 55) # list of items

print(x)

```

Output

`55`

### CMP method in python

The CMP() method in Python compares the two given objects and returns a result of 1,- 1, 0.

cmp(a, b)

#### Example: python cmp function

```# when x<y
x = 1
y = 2
print(cmp(x, y))

# when x = y
x = 2
y = 2
print(cmp(x, y))

# when x>y
x = 3
y = 2
print(cmp(x, y))
```

Output

```-1
0
1```

### Python hex method

Use of hex () method in python changed the given number to hexadecimal value.

hex(number)

#### Example: python hex function

```x = hex(555)
print(x)
```

Output

` 0x22b`

### Python oct method

Use of oct() method in python changed the given number to octal string.

oct(number)

#### Example: python oct function

```x = oct(555)
print(x)
```

Output

` 0o1053`

### int() method in python

The int() method returns an integer object from any number or string.

#### Syntax

` int(x=0, base=10)`

#### Example: string to int in python

```# integer
print("int(123) is:", int(123))

# float
print("int(123.23) is:", int(123.23))

# string
print("int('123') is:", int('123'))
```

Output

``` int(123) is: 123
int(123.23) is: 123
int('123') is: 123```

### Python len method

The `len()` the function returns the number of items in an object.

#### Syntax

` len(object)`

#### Example: get length of list python

```mylist = [1, 2, 3, 4, 5]
x = len(mylist)
print(x)
```

Output

`5`