How to hash a string into 8 digits

Question

Is there anyway that I can hash a random string into a 8 digit number without implementing any algorithms myself

User · Answer

I am sharing our nodejs implementation of the solution as implemented by  Raymond Hettinger   var crypto   require  crypto    var s    she sells sea shells by the sea shore   console log BigInt  0x    crypto createHash  sha1   update s  digest  hex     10n    8n

User · Answer

Raymond s answer is great for python2  though  you don t need the abs   nor the parens around 10    8    However  for python3  there are important caveats   First  you ll need to make sure you are passing an encoded string  These days  in most circumstances  it s probably also better to shy away from sha-1 and use something like sha-256  instead  So  the hashlib approach would be    gt  gt  gt  import hashlib  gt  gt  gt  s    your string   gt  gt  gt  int hashlib sha256 s encode  utf-8    hexdigest    16    10  8 80262417   If you want to use the hash   function instead  the important caveat is that  unlike in Python 2 x  in Python 3 x  the result of hash   will only be consistent within a process  not across python invocations  See here     python -V Python 2 7 5   python -c  print hash  foo     -4177197833195190597   python -c  print hash  foo     -4177197833195190597    python3 -V Python 3 4 2   python3 -c  print hash  foo     5790391865899772265   python3 -c  print hash  foo     -8152690834165248934   This means the hash  -based solution suggested  which can be shortened to just   hash s    10  8  will only return the same value within a given script run    Python 2    python2 -c  s  your string   print hash s    10  8   52304543   python2 -c  s  your string   print hash s    10  8   52304543   Python 3    python3 -c  s  your string   print hash s    10  8   12954124   python3 -c  s  your string   print hash s    10  8   32065451   So  depending on if this matters in your application  it did in mine   you ll probably want to stick to the hashlib-based approach

User · Answer

Just to complete JJC answer  in python 3 5 3 the behavior is correct if you use hashlib this way     python3 -c   import hashlib hash object   hashlib sha256 b Caroline   hex dig   hash object hexdigest   print hex dig    739061d73d65dcdeb755aa28da4fea16a02b9c99b4c2735f2ebfa016f3e7fded   python3 -c   import hashlib hash object   hashlib sha256 b Caroline   hex dig   hash object hexdigest   print hex dig    739061d73d65dcdeb755aa28da4fea16a02b9c99b4c2735f2ebfa016f3e7fded    python3 -V Python 3 5 3

User · Answer

Yes  you can use the built-in hashlib module or the built-in hash function   Then  chop-off the last eight digits using modulo operations or string slicing operations on the integer form of the hash   gt  gt  gt  s    she sells sea shells by the sea shore    gt  gt  gt    Use hashlib  gt  gt  gt  import hashlib  gt  gt  gt  int hashlib sha1 s encode  quot utf-8 quot    hexdigest    16     10    8  58097614L   gt  gt  gt    Use hash    gt  gt  gt  abs hash s      10    8  82148974

[python] How to hash a string into 8 digits?

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