random.seed( ) in Python
random() function is used to generate random numbers in Python. Not actually random, rather this is used to generate pseudo-random numbers. That implies that these randomly generated numbers can be determined.
random() function generates numbers for some values. This value is also called seed value.
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How Seed Function Works ?
Seed function is used to save the state of a random function, so that it can generate same random numbers on multiple executions of the code on the same machine or on different machines (for a specific seed value). The seed value is the previous value number generated by the generator. For the first time when there is no previous value, it uses current system time.
Here we will see how we can generate the same random number every time with the same seed value.
865 865 865 865 865
244 244 607
On executing the above code, the above two print statements will generate a response 244 but the third print statement gives an unpredictable response.
Uses of random.seed()
- This is used in the generation of a pseudo-random encryption key. Encryption keys are an important part of computer security. These are the kind of secret keys which used to protect data from unauthorized access over the internet.
- It makes optimization of codes easy where random numbers are used for testing. The output of the code sometime depends on input. So the use of random numbers for testing algorithms can be complex. Also seed function is used to generate same random numbers again and again and simplifies algorithm testing process.