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Mathematical Functions in Python | Set 4 (Special Functions and Constants)
• Difficulty Level : Easy
• Last Updated : 29 Jul, 2016

Some of the mathematical functions are discussed in below set 1, set 2 and set 3
Mathematical Functions in Python | Set 1 (Numeric Functions)
Mathematical Functions in Python | Set 2 (Logarithmic and Power Functions)
Mathematical Functions in Python | Set 3 (Trigonometric and Angular Functions)

Special Functions and constants are discussed in this article.

1. gamma() :- This function is used to return the gamma function of the argument.

 `# Python code to demonstrate the working of``# gamma()``  ` `# importing "math" for mathematical operations``import` `math`` ` `a ``=` `4`` ` `# returning the gamma() of 4``print` `(``"The gamma() of 4 is : "``, end``=``"")``print` `(math.gamma(a))`

Output:

```The gamma() of 4 is : 6.0
```

2. pi :- This is an inbuilt constant that outputs the value of pi(3.141592).

3. e :- This is an inbuilt constant that outputs the value of e(2.718281).

 `# Python code to demonstrate the working of``# const. pi and e``  ` `# importing "math" for mathematical operations``import` `math`` ` `# returning the value of const. pi``print` `(``"The value of const. pi is : "``, end``=``"")``print` `(math.pi)`` ` `# returning the value of const. e``print` `(``"The value of const. e is : "``, end``=``"")``print` `(math.e)`

Output:

```The value of const. pi is : 3.141592653589793
The value of const. e is : 2.718281828459045
```

4. inf :- This is a positive floating point infinity constant. -inf is used to denote the negative floating point infinity. This constant is defined in python 3.5 and above.

5. isinf() :- This function is used to check whether the value is an infinity or not.

6. nan :- This constant denotes “Not a number” in python. This constant is defined in python 3.5 and above.

7. isnan() :- This function returns true if the number is “nan” else returns false.

 `# Python code to demonstrate the working of``# inf, nan, isinf(), isnan()``  ` `# importing "math" for mathematical operations``import` `math`` ` `# checking if number is nan``if` `(math.isnan(math.nan)):``       ``print` `(``"The number is nan"``)``else` `: ``print` `(``"The number is not nan"``)`` ` `# checking if number is positive infinity``if` `(math.isinf(math.inf)):``       ``print` `(``"The number is positive infinity"``)``else` `: ``print` `(``"The number is not positive infinity"``)`

Output:

```The number is nan
The number is positive infinity
```

This article is contributed by Manjeet Singh. If you like GeeksforGeeks and would like to contribute, you can also write an article using contribute.geeksforgeeks.org or mail your article to contribute@geeksforgeeks.org. See your article appearing on the GeeksforGeeks main page and help other Geeks.

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