如何動態更新Python循環中參數的值？

Question

Python的新手在這裏：

我使用Pysage用Python寫一個市場模擬，並希望產生的代理任意數量（無論是買家或賣家）使用mgr.register_actor()功能，如下所示：

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

什麼是運行該函數調用的簡潔pythonic方法，以便每次運行循環時都會更改name，maxValuation，endowment和id的值，例如到name="buyer002", name="buyer003"...; maxValuation=95, maxValuation=90...; endowment=450, endowment=400...; "buyer002", "buyer003"...等等。

我已經嘗試了不同的for循環和列表解析，但還沒有找到一種方法來動態更新函數參數而不會遇到類型問題。

在此先感謝！

Answer 1

可以準備names，maxValuations和endowments作爲列表（或迭代器），然後使用zip到組對應的元件一起：

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) 

---

關於格式字符串，'{i:0>3d}'：

當我需要建立格式字符串時，我指的是這個「備忘單」：

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" | "%" 

所以，它打破了這樣的：

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