If I want to add an element at the beginning of an array, it seems like I must make a list, insert in place, then make an array again.
Of course, lists can be efficient too, and the insert() funtion works nicely in that case, but sometimes arrays are the best choice e.g. x=array([1,2,3]) # to put the element 0 at the head of the array listx=list(x) listx.insert(0,0) x=array(listx) # this extra effort distracts from the clarity of the code, and must slow things a little. # While I appreciate that array operations that cause memory re- allocation and copying are to be # avoided if at all possible, sometimes this is the best compromise between clarity and efficiency # A nicer piece of code would be x.insert(0,0) #or x.prepend(0) # It is a little easier to grow an array at the end (if it is not referenced) x.resize(4) I saw this interest syntax on this site x[:0]=0 I guess that is cute, but could be confusing....(and doesn't work) -- http://mail.python.org/mailman/listinfo/python-list
