# Python – math.prod() method

Math module in Python contains a number of mathematical operations, which can be performed with ease using the module. `math.prod()` method in Python is used to calculate the product of all the elements present in the given iterable. Most of the built-in containers in Python like list, tuple are iterables. The iterable must contain numeric value else non-numeric types may be rejected.
This method is new in Python version 3.8.

Syntax: math.prod(iterable, *, start = 1)

Parameters:
iterable: an iterable containing numeric values
start: an integer representing the start value. start is a named (keyword-only) parameter and its default value is 1.

Returns: the calculated product of all elements present in the given iterable.

Code #1: Use of `math.prod()` method

 `# Python Program to explain math.prod() method ` ` `  `# Importing math module ` `import` `math ` ` `  `# list ` `arr ``=` `[``1``, ``2``, ``3``, ``4``, ``5``] ` ` `  `# Calculate the product of ` `# of all elements present ` `# in the given list ` `product ``=` `math.prod(arr) ` `print``(product) ` ` `  ` `  `# tuple ` `tup ``=` `(``0.5``, ``0.6``, ``0.7``) ` ` `  `# Calculate the product  ` `# of all elements present ` `# in the given tuple ` `product ``=` `math.prod(tup) ` `print``(product) ` ` `  ` `  `# range ` `seq ``=` `range``(``1``, ``11``) ` ` `  `# Calculate the product  ` `# of all elements present ` `# in the given range ` `product ``=` `math.prod(seq) ` `print``(product) ` ` `  `# As the start value is not specified  ` `# it will default to 1 `

Output:

```120
0.21
3628800
```

Code #2: if start parameter is explicitly specified

 `# Python Program to explain math.prod() method ` ` `  `# Importing math module ` `import` `math ` ` `  ` `  `# By default start value is 1 ` `# but can be explicitly provided ` `# as a named (keyword-only) parameter ` ` `  `# list ` `arr ``=` `[``1``, ``2``, ``3``, ``4``, ``5``] ` ` `  `# Calculate the product of ` `# of all elements present ` `# in the given list ` `product ``=` `math.prod(arr, start ``=` `2``) ` `print``(product) `

Output:

```240
```

Code #3: When the given iterable is empty

 `# Python Program to explain math.prod() method ` ` `  `# Importing math module ` `import` `math ` ` `  `# If the given input iterable ` `# is empty, then this method ` `# returns the start value  ` ` `  `# list ` `arr ``=` `[] ` ` `  `# Calculate the product of ` `# of all elements present ` `# in the given list ` `product ``=` `math.prod(arr) ` `print``(product) ` ` `  ` `  `# Tuple ` `tup ``=` `() ` ` `  `# Calculate the product of ` `# of all elements present ` `# in the given tuple ` `product ``=` `math.prod(tup, start ``=` `5``) ` `print``(product) `

Output:

```1
5
```

Reference: Python math library

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