What is the best way to create a string array in python

Question

I m relatively new to Python and it s libraries and I was wondering how I might create a string array with a preset size  It s easy in java but I was wondering how I might do this in python    So far all I can think of is   strs        size   And some how when I try to call string methods on it  the debugger gives me an error X operation does not exist in object tuple   And if it was in java this is what I would want to do   String   ar   new String size   Arrays fill ar        Please help    Error code      strs sum-1    strs sum-1  strip         AttributeError   tuple  object has no attribute  strip    Question  How might I do what I can normally do in Java in Python while still keeping the code clean

User · Accepted Answer

In python  you wouldn t normally do what you are trying to do  But  the below code will do it   strs       for x in range size

User · Answer

If you want to take input from user here is the code If each string is given in new line  strs    input   for i in range size    If the strings are separated by spaces  strs   list input   split

User · Answer

strlist       10 strlist 0    set   strlist 0  add  quot Beef quot   strlist 0  add  quot Fish quot   strlist 1      quot Apple quot    quot Banana quot   strlist 1  add  quot Cherry quot   print strlist 0   print strlist 1   print strlist 2   print  quot Array size  quot   len strlist   print strlist

User · Answer

Are you trying to do something like this    gt  gt  gt  strs    s strip         for s in   some       list     of    strings     gt  gt  gt  strs    some    list    of    strings

User · Answer

def  remove regex input text  regex pattern       findregs   re finditer regex pattern  input text       for i in findregs           input text   re sub i group   strip        input text      return input text  regex pattern   r  buntil b  bcan b  bboat b   remove regex  row and row and row your boat until you can row no more   regex pattern     w means that it matches word characters  a b means match either a or b   b represents a word boundary

User · Answer

The simple answer is   You don t   At the point where you need something to be of fixed length  you re either stuck on old habits or writing for a very specific problem with its own unique set of constraints

User · Answer

The error message says it all  strs sum-1  is a tuple  not a string  If you show more of your code someone will probably be able to help you  Without that we can only guess

User · Answer

In Python  the tendency is usually that one would use a non-fixed size list  that is to say items can be appended removed to it dynamically   If you followed this  there would be no need to allocate a fixed-size collection ahead of time and fill it in with empty values  Rather  as you get or create strings  you simply add them to the list  When it comes time to remove values  you simply remove the appropriate value from the string  I would imagine you can probably use this technique for this  For example  in Python 2 x syntax     gt  gt  gt  temp list       gt  gt  gt  print temp list     gt  gt  gt    gt  gt  gt  temp list append  one    gt  gt  gt  temp list append  two    gt  gt  gt  print temp list   one    two    gt  gt  gt    gt  gt  gt  temp list append  three    gt  gt  gt  print temp list   one    two    three    gt  gt  gt     Of course  some situations might call for something more specific  In your case  a good idea may be to use a deque  Check out the post here  Python  forcing a list to a fixed size  With this  you can create a deque which has a fixed size  If a new value is appended to the end  the first element  head of the deque  is removed and the new item is appended onto the deque  This may work for what you need  but I don t believe this is considered the  norm  for Python

User · Answer

Sometimes I need a empty char array  You cannot do  np empty size   because error will be reported if you fill in char later  Then I usually do something quite clumsy but it is still one way to do it     Suppose you want a size N char array charlist         N   other preset character is fine as well  like  x  chararray   np array charlist    Then you change the content of the array chararray somecondition1     a  chararray somecondition2     b    The bad part of this is that your array has default values  if you forget to change them

User · Answer

But what is a reason to use fixed size  There is no actual need in python to use fixed size arrays lists  so you always have ability to increase it s size using append  extend or decrease using pop  or at least you can use slicing   x        for x in xrange 10

User · Answer

The best and most convenient method for creating a string array in python is with the help of NumPy library   Example    import numpy as np arr   np chararray  rows  columns     This will create an array having all the entries as empty strings  You can then initialize the array using either indexing or slicing

[python] What is the best way to create a string array in python?

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