Random strings in Python

Question

How do you create a random string in Python   I needed it to be number then character repeat till you re done this is what I created  def random id length       number    0123456789      alpha    abcdefghijklmnopqrstuvwxyz      id          for i in range 0 length 2           id    random choice number          id    random choice alpha      return id

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Generating strings from  for example  lowercase characters   import random  string  def randomword length      letters   string ascii lowercase    return    join random choice letters  for i in range length     Results    gt  gt  gt  randomword 10   vxnxikmhdc   gt  gt  gt  randomword 10   ytqhdohksy

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You can build random ascii characters like   import random print chr random randint 0 255     And then build up a longer string like   len   50 print    join   chr random randint 0 255   for i in xrange 0 len

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This function generates random string consisting of upper lowercase letters  digits  pass the length seperator  no of blocks to specify your string format  eg  len sep   4  no of blocks   4 will generate the following pattern      F4nQ-Vh5z-JKEC-WhuS   Where  length seperator will add  -  after 4 characters     XXXX-   no of blocks will generate the following patten of characters as string     XXXX - XXXX - XXXX - XXXX   if a single random string is needed  just keep the no of blocks variable to be equal to 1 and len sep to specify the length of the random string   eg  len sep   10  no of blocks   1  will generate the following pattern ie  random string of length 10      F01xgCdoDU   import random as r  def generate random string len sep  no of blocks       random string          random str seq    0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ      for i in range 0 len sep no of blocks           if i   len sep    0 and i    0              random string     -          random string    str random str seq r randint 0  len random str seq  - 1        return random string

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Install this package       pip3 install py essentials   And use this code   from py essentials import simpleRandom as sr print sr randomString 4     More informations about the method other parameters are available here

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Answer to the original question   os urandom n    Quote from  http   docs python org 2 library os html     Return a string of n random bytes suitable for cryptographic use       This function returns random bytes from an OS-specific randomness   source  The returned data should be unpredictable enough for   cryptographic applications  though its exact quality depends on the OS   implementation  On a UNIX-like system this will query  dev urandom    and on Windows it will use CryptGenRandom  If a randomness source is   not found  NotImplementedError will be raised       For an easy-to-use interface to the random number generator provided   by your platform  please see random SystemRandom

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gt  gt  gt  import random  gt  gt  gt  import string  gt  gt  gt  s string lowercase string digits  gt  gt  gt     join random sample s 10    jw72qidagk

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Sometimes  I ve wanted random strings that are semi-pronounceable  semi-memorable  import random  def randomWord length 5       consonants    quot bcdfghjklmnpqrstvwxyz quot      vowels    quot aeiou quot       return  quot  quot  join random choice  consonants  vowels  i 2   for i in range length    Then   gt  gt  gt  randomWord   nibit  gt  gt  gt  randomWord   piber  gt  gt  gt  randomWord 10  rubirikiro  To avoid 4-letter words  don t set length to 4  Jim

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Since this question is fairly  uh  random  this may work for you        gt  gt  gt  import uuid  gt  gt  gt  print uuid uuid4   58fe9784-f60a-42bc-aa94-eb8f1a7e5c17

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random name   lambda length     join random sample string letters  length     length must be  lt   len string letters    53  result example       gt  gt  gt   random name x  for x in range 1 20     V    Rq    YtL    AmUF    loFdS    eNpRFy    iWFGtDz    ZTNgCvLA    fjUDXJvMP    EBrPcYKUvZ    GmxPKCnbfih    nSiNmCRktdWZ    VWKSsGwlBeXUr    i stIFGTUlZqnav    bqfwgBhyTJMUEzF    VLXlPiQnhptZyoHq    BXWATvwLCUcVesFfk    jLngHmTBtoOSsQlezV    JOUhklIwDBMFzrTCPub    gt  gt  gt     Enjoy

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In python3 6  you can use the secrets module   The secrets module is used for generating cryptographically strong random numbers suitable for managing data such as passwords  account authentication  security tokens  and related secrets  In particularly  secrets should be used in preference to the default pseudo-random number generator in the random module  which is designed for modelling and simulation  not security or cryptography   In testing generation of 768bit security tokens I found   random choices   - 0 000246 secs secrets choice   - 0 003529 secs  The secrets modules is slower but outside of testing it is what you should be using for cryptographic purposes  import string  secrets  def random string size                   letters   string ascii lowercase string ascii uppercase string digits                     return    join secrets choice letters  for i in range size    print random string 768

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import random  import string  def get random string size       chars   string ascii lowercase string ascii uppercase string digits        join random choice chars  for   in range size    print get random string 20    output   FfxjmkyyLG5HvLeRudDS

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try importing the below package from random import

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You haven t really said much about what sort of random string you need  But in any case  you should look into the random module   A very simple solution is pasted below   import random  def randstring length 10       valid letters  ABCDEFGHIJKLMNOPQRSTUVWXYZ      return    join  random choice valid letters  for i in xrange length     print randstring   print randstring 20

[python] Random strings in Python

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