In Python How can I declare a Dynamic Array

Question

I want to declare an Array and all items present in the ListBox Should Be deleted irrespective of the Group name present in the ListBox  can any body help me coding in Python  I am using WINXP OS  amp  Python 2 6

User · Answer

In python  A dynamic array is an  array  from the array module  E g    from array import array x   array  d              d  denotes an array of type double x append 1 1  x append 2 2  x pop                     returns 2 2   This datatype is essentially a cross between the built-in  list  type and the numpy  ndarray  type  Like an ndarray  elements in arrays are C types  specified at initialization  They are not pointers to python objects  this may help avoid some misuse and semantic errors  and modestly improves performance    However  this datatype has essentially the same methods as a python list  barring a few string  amp  file conversion methods  It lacks all the extra numerical functionality of an ndarray    See https   docs python org 2 library array html for details

User · Answer

you can declare a Numpy array dynamically for 1 dimension as shown below  import numpy as np n   2 new table   np empty shape  n 1    new table 0 0    2 new table 1 0    3 print new table   The above example assumes we know we need to have 1 column but we want to allocate the number of rows dynamically  in this case the number or rows required is equal to 2  output is shown below    2    3

User · Answer

Here s a great method I recently found on a different stack overflow post  regarding multi-dimensional arrays  but the answer works beautifully for single dimensional arrays as well     Create an 8 x 5 matrix of 0 s  w  h   8  5  MyMatrix      0 for x in range  w    for y in range  h          Create an array of objects  MyList        for x in range  n       I love this because you can specify the contents and size dynamically  in one line    One more for the road     Dynamic content initialization  MyFunkyArray     x   a   b for x in range   n

User · Answer

In Python  a list is a dynamic array  You can create one like this   lst        Declares an empty list named lst   Or you can fill it with items   lst    1 2 3    You can add items using  append    lst append  a     You can iterate over elements of the list using the for loop   for item in lst        Do something with item   Or  if you d like to keep track of the current index   for idx  item in enumerate lst         idx is the current idx  while item is lst idx    To remove elements  you can use the del command or the remove function as in   del lst 0    Deletes the first item lst remove x    Removes the first occurence of x in the list   Note  though  that one cannot iterate over the list and modify it at the same time  to do that  you should instead iterate over a slice of the list  which is basically a copy of the list   As in    for item in lst       Notice the     which makes a slice          Now we can modify lst  since we are iterating over a copy of it

[python] In Python How can I declare a Dynamic Array

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