[Tutor] Re: Nested Lists / Array Module

[Shantanoo Mahajan]

  +-- Harm_Kirchhoff at mail.digital.co.jp [python-tutor] [22-10-03 05:37 IST]:
  | Python supports nested lists, which is very nice and can be used for very 
  | simple databases.
  | 
  | However, I could not find a way to write nested lists to files & retrieve 
  | them easily.
  | The .writelines() method expects a string as an argument.
  | 
  | Is there a method to dump any list on disk & read it back, or is it 
  | necessary to code this task ?
  | 
  | The array module seems to have such method, however, I could not find 
  | sufficient code examples to understand how the array module works. The 
  | Python Library Reference mentions the .fromfile() and .tofile() methods, 
  | does anyone have experience with the array module, especially whether it 
  | allows to write & retrieve nested arrays without problems ? Could you pass 
  | me some sample code ?
  | 
  |  
  | Harm 

import pickle
f=open('test','w+')
a=[[1,2,3,4],[1,2,[123]]]
pickle.dump(a,f)
f.seek(0)
b=pickle.load(f)
print a,b


-- 
With Best Regards,
Shantanoo Mahajan