How to dynamically update values to arguments in Python loop?

Python newbie here:

I'm writing a market simulation in Python using Pysage, and want to generate an arbitrary number of agents (either buyers or sellers) using the mgr.register_actor() function, as follows:

for name, maxValuation, endowment, id in xrange(5):
    mgr.register_actor(Buyer(name="buyer001", maxValuation=100, endowment=500),"buyer001")
    update name, maxValuation, endowment, id

What is a succinct, pythonic way 开发者_运维百科to run that function call so that, each time the loop is run, the values of name, maxValuation, endowment, and id are changed, e.g. to name="buyer002", name="buyer003"...; maxValuation=95, maxValuation=90...; endowment=450, endowment=400...; "buyer002", "buyer003"... and so on.

I have tried different for-loops and list comprehensions, but haven't found a way yet to dynamically update the function arguments without running into type issues.

Thanks in advance!

You can prepare the names, maxValuations, and endowments as lists (or iterators), then use zip to group corresponding elements together:

names=['buyer{i:0>3d}'.format(i=i) for i in range(1,6)]
maxValuations=range(100,75,-5)
endowments=range(500,250,-50)
for name, maxValuation, endowment in zip(names,maxValuations,endowments):
    mgr.register_actor(
        Buyer(name=name, maxValuation=maxValuation, endowment=endowment),name)

Regarding the format string, '{i:0>3d}':

I refer to this "cheat sheet" when I need to build a format string:

http://docs.python.org/library/string.html#format-string-syntax
replacement_field ::= "{" field_name ["!" conversion] [":" format_spec] "}"
field_name        ::= (identifier|integer)("."attribute_name|"["element_index"]")* 
attribute_name    ::= identifier
element_index     ::= integer
conversion        ::= "r" | "s"
format_spec       ::= [[fill]align][sign][#][0][width][.precision][type]
fill              ::= <a character other than '}'>
align             ::= "<" | ">" | "=" | "^"
                      "=" forces the padding to be placed after the sign (if any)
                          but before the digits. (for numeric types)
sign              ::= "+" | "-" | " "
                      " " places a leading space for positive numbers
width             ::= integer
precision         ::= integer
type              ::= "b" | "c" | "d" | "e" | "E" | "f" | "F" | "g" | "G" | "n" |
                      "o" | "x" | "X" | "%"

So, it breaks down like this:

   field_name 
  /
{i:0>3d}
    \\\\
     \\\`-type ("d" means integer)
      \\`-width 
       \`-alignment (">" means right adjust)
        `-fill character