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other:python:misc_by_jyp [2023/12/08 15:36]
jypeter Added the efficient looping section
other:python:misc_by_jyp [2023/12/08 15:51] (current)
jypeter [Efficient looping with numpy, map and itertools] Added list comprehension
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-===== Efficient looping with numpy, map and itertools =====+===== Efficient looping with numpy, mapitertools ​and list comprehension ​=====
  
-<wrap hi>Big, nested, explicit loops should be avoided at all cost</​wrap>,​ in order to reduce a script execution time!+<wrap hi>Big, nested, explicit ​''​for'' ​loops should be avoided at all cost</​wrap>,​ in order to reduce a script execution time!
  
   * **''​numpy''​ arrays** should be used when dealing with //numerical data//   * **''​numpy''​ arrays** should be used when dealing with //numerical data//
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 ... ...
 A0$, A0!, A1$, A1!, B0$, B0!, B1$, B1!,</​code>​ A0$, A0!, A1$, A1!, B0$, B0!, B1$, B1!,</​code>​
 +
 +  * The [[https://​docs.python.org/​3/​tutorial/​datastructures.html?​highlight=comprehension#​list-comprehensions|list comprehension]] (aka //implicit loops//) can also be used to generate lists from lists
 +    * Example: converting a list of integers to a list of strings\\ Note: in that case, you should rather use the ''​map''​ function detailed above
 +      * <​code>>>>​ my_ints = [1, 2, 3]
 +
 +>>>​ [ str(ii) for ii in my_ints ]
 +['​1',​ '​2',​ '​3'​]</​code>​
 ===== numpy related stuff ===== ===== numpy related stuff =====
  
other/python/misc_by_jyp.txt · Last modified: 2023/12/08 15:51 by jypeter