How do you see the entire command history in interactive Python

Question

I m working on the default python interpreter on Mac OS X  and I Cmd K  cleared  my earlier commands  I can go through them one by one using the arrow keys  But is there an option like the --history option in bash shell  which shows you all the commands you ve entered so far

User · Answer

In IPython  history -g should give you the entire command history  The default configuration also saves your history into a file named  python history in your user directory

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Rehash of Doogle s answer that doesn t printline numbers  but does allow specifying the number of lines to print  def history lastn None        quot  quot  quot      param  lastn Defaults to None i e full history  If specified then returns lastn records from history             Also takes -ve sequence for first n history records       quot  quot  quot      import readline     assert lastn is None or isinstance lastn  int    quot Only integers are allowed  quot      hlen   readline get current history length       is neg   lastn is not None and lastn  lt  0     if not is neg          for r in range 1 hlen 1  if not lastn else range 1  hlen 1  -lastn                print readline get history item r       else          for r in range 1  -lastn   1               print readline get history item r

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A simple function to get the history similar to unix bash version  Hope it helps some new folks  def ipyhistory lastn None        quot  quot  quot      param  lastn Defaults to None i e full history  If specified then returns lastn records from history             Also takes -ve sequence for first n history records       quot  quot  quot      import readline     assert lastn is None or isinstance lastn  int    quot Only integers are allowed  quot      hlen   readline get current history length       is neg   lastn is not None and lastn  lt  0     if not is neg          flen   len str hlen   if not lastn else len str lastn           for r in range 1 hlen 1  if not lastn else range 1  hlen 1  -lastn                print  quot    quot  join  str r if not lastn else r   lastn - hlen   rjust flen   readline get history item r         else          flen   len str -hlen           for r in range 1  -lastn   1               print  quot    quot  join  str r  rjust flen   readline get history item r      Snippet  Tested with Python3  Let me know if there are any glitches with python2  Samples   Full History   ipyhistory     Last 10 History  ipyhistory 10    First 10 History  ipyhistory -10   Hope it helps fellas

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Code for printing the entire history   Python 3  One-liner  quick copy and paste    import readline  print   n  join  str readline get history item i   1   for i in range readline get current history length          Or longer version      import readline for i in range readline get current history length         print  readline get history item i   1     Python 2  One-liner  quick copy and paste    import readline  print   n  join  str readline get history item i   1   for i in range readline get current history length         Or longer version      import readline for i in range readline get current history length         print readline get history item i   1    Note  get history item   is indexed from 1 to n

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This should give you the commands printed out in separate lines   import readline map lambda p print readline get history item p        map lambda p p  range readline get current history length

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If you want to write the history to a file   import readline readline write history file  python history txt     The help function gives   Help on built-in function write history file in module readline   write history file          write history file  filename   - gt  None     Save a readline history file      The default filename is    history

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With python 3 interpreter the history is written to    python history

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Use readline get current history length   to get the length  and readline get history item   to view each

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Since the above only works for python 2 x for python 3 x  specifically 3 5  is similar but with a slight modification   import readline for i in range readline get current history length         print  readline get history item i   1     note the extra      using shell scripts to parse  python history or using python to modify the above code is a matter of personal taste and situation imho

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Jason-V  it really help  thanks  then  i found this examples and composed to own snippet       usr bin env python3 import os  readline  atexit python history   os path join os environ  HOME      python history   try    readline read history file python history    readline parse and bind  tab  complete     readline set history length 5000    atexit register readline write history file  python history  except IOError    pass del os  python history  readline  atexit

[python] How do you see the entire command history in interactive Python?

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