Category: Random number generator python stack overflow

Using the random module, we can generate pseudo-random numbers. The function random generates a random number between zero and one [0, 0. Numbers generated with this module are not truly random but they are enough random for most purposes. We can generate a pseudo random floating point number with this small code:.

Generate a random number between 1 and To generate a whole number integer between one and one hundred use:. Random number between 1 and 10 To generate a random floating point number between 1 and 10 you can use the uniform function. If you are new to Python programming, I highly recommend this book. Hi Harsi, in Python 3 you need bracket around a print statement. This file is one of the standard python modules. You can see the source code of random. The program app.

The sample function can return a list of numbers. If you want you can call the random class seed function, which uses the system time to initialize. I'm curious why this isn't allowed, and if there is an alternative that I haven't been able to find for extracting multiple random values from a series of value.

For now, all I've come up with is using the choice alternative with a loop for however large my sample pool needs to be, but I have a feeling there's a better way to do it. Admittedly, I haven't read through all of the documentation for random thoroughly, but I haven't found a better solution. I figured that someone with a bit of knowledge would be my best bet. Any suggestions? As an aside, I should note I'm using 2. I know they changed some stuff with Python 3.

I think you answered my question pretty well. My mistake was in not addressing the derived sample with an index value, so I was essentially attempting mathematics against a list rather than single values from within the list.

It somehow slipped past me that sample returned a list. I guess it's a beginner mistake and lack of attention on my part.

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Is the behavior of a loop iteration of choice essentially the same as the returned sample list? For clarification, a simple example would be a loop that iterates 4 times using choice and storing the returned values in a list, versus a sample of 4 the same values. Would that essentially return the same chance of random values?

Also, supposing they essentially return the similar randomness in their values, is there a performance difference over larger iterations? Common sense tells me that since the looping choice jumps right to the chase, but a sample first stores the values in a new list and that list then needs to be iterated over, looping choice would be the cleaner and more efficient alternative.

Am I mistaken?In Python, just like in almost any other OOP language, chances are that you'll find yourself needing to generate a random number at some point. The code above will print 10 random values of numbers between 1 and The second line, for x in range 10determines how many values will be printed when you use range xthe number that you use in place of x will be the amount of values that you'll have printed. Then the third line: print random.

The process is fairly simple. What if, however, you wanted to select a random integer that was between 1 and but also a multiple of five? This is a little more complicated.

The process is the same, but you'll need to use a little more arithmetic to make sure that the random integer is in fact a multiple of five. Check out the code below:. Basically this code will generate a random number between 1 and 20, and then multiply that number by 5. Play around with the code yourself and see if you can generate a random number between where every number generated is a multiple of ten!

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How to Generate a Random Number in Python. Published: Wednesday 15 th February Latest Articles what is the string in python Lists in Python: How to create a list in Python How to create dictionary in python How to run Python scripts What can you do with python: Usage guide.Released: Aug 1, View statistics for this project via Libraries.

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Files for namegenerator, version 1. Close Hashes for namegenerator File type Source.For integers, there is uniform selection from a range. For sequences, there is uniform selection of a random element, a function to generate a random permutation of a list in-place, and a function for random sampling without replacement.

On the real line, there are functions to compute uniform, normal Gaussianlognormal, negative exponential, gamma, and beta distributions. For generating distributions of angles, the von Mises distribution is available.

Almost all module functions depend on the basic function randomwhich generates a random float uniformly in the semi-open range [0. Python uses the Mersenne Twister as the core generator. The underlying implementation in C is both fast and threadsafe. The Mersenne Twister is one of the most extensively tested random number generators in existence. However, being completely deterministic, it is not suitable for all purposes, and is completely unsuitable for cryptographic purposes. The functions supplied by this module are actually bound methods of a hidden instance of the random.

Random class. Class Random can also be subclassed if you want to use a different basic generator of your own devising: in that case, override the randomseedgetstateand setstate methods. Optionally, a new generator can supply a getrandbits method — this allows randrange to produce selections over an arbitrarily large range. The random module also provides the SystemRandom class which uses the system function os.

The pseudo-random generators of this module should not be used for security purposes.

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For security or cryptographic uses, see the secrets module. Matsumoto and T. Complementary-Multiply-with-Carry recipe for a compatible alternative random number generator with a long period and comparatively simple update operations. If a is omitted or Nonethe current system time is used. If randomness sources are provided by the operating system, they are used instead of the system time see the os. With version 2 the defaulta strbytesor bytearray object gets converted to an int and all of its bits are used.

With version 1 provided for reproducing random sequences from older versions of Pythonthe algorithm for str and bytes generates a narrower range of seeds. Changed in version 3. Deprecated since version 3.Join Stack Overflow to learn, share knowledge, and build your career.

Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. So say that I generate a random number using random. In essence, "predict" the random number. How might I customize the time that random uses to seed itself?

I thought to do the following based on how the random module seeds:. However, that gave me separate numbers and I don't understand why.

random number generator python stack overflow

Should they not be done at the same instance in time? Assume that random. Note that I do not want to do this in the past, so not get the state and then restore it, but be able to generate what will be generated in the future.

I think you actually do have a urandom of sorts or at the very least the following does not throw an exception.

random number generator python stack overflow

Now assuming that lets modify the random lib which can be found here. Learn more. Python - Generate random number from custom time Ask Question. Asked 6 years, 1 month ago. Active 4 years, 8 months ago. Viewed 2k times. I thought to do the following based on how the random module seeds: import random import time print random.

Improve this question. If python is not given a seed then it generates it based off the current time since the epoch. Also note that starting in Python 2. I think it's impossible to to what you are trying to do, mostly because there's a small delay in the time module, a fraction of milliseconds that enough to render the prediction impossible.

Active Oldest Votes. Actually I was wrong. Improve this answer. You just seeded with the same number twice. Victory Victory 5, 21 21 silver badges 43 43 bronze badges.

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Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password. Post as a guest Name. Email Required, but never shown. The Overflow Blog. Episode Gaming PCs to heat your home, oceans to cool your data centers. Featured on Meta. Related Hot Network Questions.Cross Validated is a question and answer site for people interested in statistics, machine learning, data analysis, data mining, and data visualization. It only takes a minute to sign up. In my program I need to run N separate threads each with their own RNG which is used to sample a large dataset.

I need to be able to seed this entire process with a single value so I can reproduce results. I don't know if this is good practice or if there's a better way of doing this.

It's not great practice, certainly.

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For example, consider what happens when you do two runs with root seeds of and Each run will have N-1 streams in common. Mersenne Twister implementations including numpy. Split that stream up into N state vectors and use RandomState. You may have to consult the C sources of numpy. This way you use a single seed and your sequences are all uniform and independent. There is now a Python package called RandomGen that has methods to achieve this.

It supports independent streams created from a single seed, as well as a jumping protocol for older random number generators such as MT Some people claim that there are correlations in the random numbers generated by sequential seeds.

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If you are worried about it, why not use a single random number generator to choose the seeds for all of the other generators? Sign up to join this community. The best answers are voted up and rise to the top. Best way to seed N independent random number generators from 1 value Ask Question. Asked 4 years, 4 months ago.

random number generator python stack overflow

Active 1 year, 11 months ago. Viewed 6k times. Is it sufficient to simply sequentially increase the seed for each index? Snippet of code below: If a random number generator seed exists if self. Improve this question. EricR EricR 2 2 silver badges 4 4 bronze badges.

It samples regions which are summed until a threshold is it.

random number generator python stack overflow

The sizes of the regions can vary significantly. Active Oldest Votes.Python defines a set of functions that are used to generate or manipulate random numbers through the random module.

Functions in the random module rely on a pseudo-random number generator function randomwhich generates a random float number between 0.

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These particular type of functions is used in a lot of games, lotteries, or any application requiring a random number generation. 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. Shuffling means changing the position of the elements of the sequence. Here, the shuffling operation is in place.

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Writing code in comment? Please use ide. Related Articles. Random Number Operations 1. Python3 program to demonstrate the use of. Python code to demonstrate the working of. The last parameter 3 is step size to skip.

Printing list before shuffling. Printing list after shuffling. Recommended Articles. Article Contributed By :. Current difficulty : Easy. Easy Normal Medium Hard Expert.

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