I have created a piece of python code; however, I want to execute it from the command line with some arguments and options. What I have so far works ok (with the exception that i CANNOT enter in negative values for the arguments -- and i need to be able to!) How can i better write this code?

What i enter on the command line:

C:\...>mycode.p y arg1 arg2 arg3 -o filename -p filename -q filename (this is 3 arguments...

I am working with very large lists. I wish to replace elements satisfying a rule as quickly as possible.

For Example:

rule: if x < 0, replace with 0

Mylist: [1, 2, -4, -3, 4, -9]

Newlist: [1, 2, 0, 0, 4, 0]

I have Mylist and want to get Newlist. My best guess is to use enumerate, but not sure how to write this appropriately. Thanks

I am trying to return a list of indices for elements within another list that pass some sort of rule (as fast as possible). Currently I am doing:

Elementspassed=[elem for elem in Mylist if point > elem]

for x in Elements passed:
newlist.append( Mylist.index(x) )
Mylist[Mylist.index(x)]=[]

I want to incorporate the for loop into the previous line. I am working with extremely large...