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# python tutorial - Python Math | Mathematical Functions in Python | Special Functions and Constants - learn python - python programming

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

python - Sample - python code :

python tutorial - 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 - Sample - python code :

python tutorial - 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 - Sample - python code :

python tutorial - Output :

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

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