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# Python | sympy.randprime() method

• Last Updated : 27 Aug, 2019

With the help of sympy.randprime() method, we can find a random prime number in the range [a, b), where a and b are parameters to the method.

Syntax: randprime(a, b)

Parameter:
a – It denotes the start of the range. It is inclusive.
b – It denotes the end of the range. It is not inclusive.

Returns: Returns a random prime in the given range. If no prime is present in the range then it raises a ValueError.

Example #1:

 `# import randprime() method from sympy``from` `sympy ``import` `randprime`` ` `a ``=` `4``b ``=` `50`` ` `# Use randprime() method ``a_randprime_b ``=` `randprime(a, b) ``     ` `print``(``"A random prime between {} and {} is {}"``.``format``(a, b, a_randprime_b))`

Output:

```A random prime between 4 and 50 is 37
```

Example #2:

 `# import randprime() method from sympy``from` `sympy ``import` `randprime`` ` `a ``=` `60``b ``=` `100`` ` `# Use randprime() method ``a_randprime_b ``=` `randprime(a, b) ``     ` `print``(``"A random prime between {} and {} is {}"``.``format``(a, b, a_randprime_b))          `

Output:

```A random prime between 60 and 100 is 79
```

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