雖然 CPython 裡頭的 module，在 IronPython 裡頭都有一份，不過還是有一些地方有點殘缺，像是如果用了 minidom 來 parse XML，就會發現少了 expat.py ，需要用 http://ironpython.codeplex.com/workitem/20023 裡頭提到的方式修正。

事實上，如果用了 IronPython，感覺起來全部使用 .Net 的東西，會比呼叫 C:\Program Files\IronPython\Lib 裡頭的東西好。如果你想要將 IronPython 寫出的 script 編譯成 .Net 的 .dll 或 .exe 的時候，就會發現要把用到 CPython 的東西包進來，不是什麼容易的事情，那麼還不如都呼叫 .Net 提供的 class 使用—直接就在寫一個 .Net 程式，只是語言換成 Python。

那這樣其實跟寫 VB 差不多嘛。

cocoaheads:

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簡單筆記一下。

CPython 當中的字串，基本上就是當成一串 C 的 char[]，但是 IronPython 裡頭，字串裡頭的每個字，都是一個 Unicode 字元—IronPython 的字串，其實是用 .Net 裡頭的字串實作的，基本上我們只要把 IronPython 的字串當成 System.String 處理就好。於是我前兩天遇到一個問題：我有一段程式，基本上是要取出一段字串裡頭的每個 char，然後把每個 char 根據一定的規則換掉，在 CPython 裡頭，基本上就像這樣：

length = len(originalString)
for i in range(0, length):
    c = ord(originalString[i])

這樣的程式在 IronPython 裡頭的結果會完全不一樣。同樣呼叫 len(“中文”)，在 CPython 裡頭會得到 6，在 IronPython 裡頭會得到 2。要得到跟 CPython 一樣的結果，我們在 IronPython 裡頭，需要先把 Unicode 字串轉成 ASCII 處理，而這時候…看來要用點 .Net 的東西

import clr
clr.AddReference("System")
import System
originalData = System.Text.Encoding.UTF8.GetBytes(originalString)
convertedData = System.Text.Encoding.Convert(System.Text.Encoding.UTF8,
System.Text.Encoding.ASCII, originalData)
length = len(convertedData)

for i in range(0, length):
    c = System.Convert.ToInt32(convertedData[i])

真囉唆。

[Update] 對，Python 3 的字串也都已經換成 Unicode 了，但是手上這些東西要換成 Python 3 還是有點麻煩啊（搔頭）。尤其是我經常會呼叫 PyObjC，而這就會牽涉到 Mac OS X 給的 Python.Framework 裡頭，給的 Python 是那個版本。

NSLog(@”[NSString superclass] %@”, NSStringFromClass([NSString superclass]));

NSLog(@”[[NSString string] class] %@”, [[NSString string] class]);

NSLog(@”[[NSString string] superclass] %@”, NSStringFromClass([[NSString string] superclass]));

NSLog(@”[NSMutableString superclass] %@”, NSStringFromClass([NSMutableString superclass]));

NSLog(@”[[NSMutableString string] class] %@”, NSStringFromClass([[NSMutableString string] class]));

NSLog(@”[[NSMutableString string] superclass] %@”, NSStringFromClass([[NSMutableString string] superclass]));

NSLog(@”[NSValue superclass] %@”, NSStringFromClass([NSValue superclass]));

NSLog(@”[[NSValue valueWithRange:] class] %@”, [[NSValue valueWithRange:NSMakeRange(0, 0)] class]);

NSLog(@”[[NSValue valueWithRange:] superclass] %@”, NSStringFromClass([[NSValue valueWithRange:NSMakeRange(0, 0)] superclass]));

NSLog(@”[NSNumber superclass] %@”, NSStringFromClass([NSNumber superclass]));

NSLog(@”[[NSNumber numberWithInt] class] %@”, [[NSNumber numberWithInt:1] class]);

NSLog(@”[[NSNumber numberWithInt] superclass] %@”, NSStringFromClass([[NSNumber numberWithInt:1] superclass]));

NSLog(@”[NSArray superclass] %@”, NSStringFromClass([NSArray superclass]));

NSLog(@”[[NSArray array] class] %@”, NSStringFromClass([[NSArray array] class]));

NSLog(@”[[NSArray array] superclass] %@”, NSStringFromClass([[NSArray array] superclass]));

NSLog(@”[NSMutableArray superclass] %@”, NSStringFromClass([NSMutableArray superclass]));

NSLog(@”[[NSMutableArray array] class] %@”, NSStringFromClass([[NSMutableArray array] class]));

NSLog(@”[[NSMutableArray array] superclass] %@”, NSStringFromClass([[NSMutableArray array] superclass]));

NSLog(@”[NSDictionary superclass] %@”, NSStringFromClass([NSDictionary superclass]));

NSLog(@”[[NSDictionary dictionary] class] %@”, NSStringFromClass([[NSDictionary dictionary] class]));

NSLog(@”[[NSDictionary dictionary] superclass] %@”, NSStringFromClass([[NSDictionary dictionary] superclass]));

NSLog(@”[NSMutableDictionary superclass] %@”, NSStringFromClass([NSMutableDictionary superclass]));

NSLog(@”[[NSMutableDictionary dictionary] class] %@”, NSStringFromClass([[NSMutableDictionary dictionary] class]));

NSLog(@”[[NSMutableDictionary dictionary] superclass] %@”, NSStringFromClass([[NSMutableDictionary dictionary] superclass]));

NSLog(@”[NSData superclass] %@”, NSStringFromClass([NSData superclass]));

NSLog(@”[[NSData data] class] %@”, NSStringFromClass([[NSData data] class]));

NSLog(@”[[NSData data] superclass] %@”, NSStringFromClass([[NSData data] superclass]));

NSLog(@”[NSMutableData superclass] %@”, NSStringFromClass([NSMutableData superclass]));

NSLog(@”[[NSMutableData data] class] %@”, NSStringFromClass([[NSMutableData data] class]));

NSLog(@”[[NSMutableData data] superclass] %@”, NSStringFromClass([[NSMutableData data] superclass]));

NSLog(@”[NSSet superclass] %@”, NSStringFromClass([NSSet superclass]));

NSLog(@”[[NSSet set] class] %@”, NSStringFromClass([[NSSet set] class]));

NSLog(@”[[NSSet set] superclass] %@”, NSStringFromClass([[NSSet set] superclass]));

NSLog(@”[NSMutableSet superclass] %@”, NSStringFromClass([NSMutableSet superclass]));

NSLog(@”[[NSMutableSet set] class] %@”, NSStringFromClass([[NSMutableSet set] class]));

NSLog(@”[[NSMutableSet set] superclass] %@”, NSStringFromClass([[NSMutableSet set] superclass]));

結果是：

[NSString superclass] NSObject

[[NSString string] class] NSCFString

[[NSString string] superclass] NSMutableString

[NSMutableString superclass] NSString

[[NSMutableString string] class] NSCFString

[[NSMutableString string] superclass] NSMutableString

[NSValue superclass] NSObject

[[NSValue valueWithRange:] class] NSConcreteValue

[[NSValue valueWithRange:] superclass] NSValue

[NSNumber superclass] NSValue

[[NSNumber numberWithInt] class] NSCFNumber

[[NSNumber numberWithInt] superclass] NSNumber

[NSArray superclass] NSObject

[[NSArray array] class] __NSArrayI

[[NSArray array] superclass] NSArray

[NSMutableArray superclass] NSArray

[[NSMutableArray array] class] __NSArrayM

[[NSMutableArray array] superclass] NSMutableArray

[NSDictionary superclass] NSObject

[[NSDictionary dictionary] class] __NSDictionary0

[[NSDictionary dictionary] superclass] NSDictionary

[NSMutableDictionary superclass] NSDictionary

[[NSMutableDictionary dictionary] class] __NSCFDictionary

[[NSMutableDictionary dictionary] superclass] NSMutableDictionary

[NSData superclass] NSObject

[[NSData data] class] NSConcreteData

[[NSData data] superclass] NSData

[NSMutableData superclass] NSData

[[NSMutableData data] class] NSConcreteMutableData

[[NSMutableData data] superclass] NSMutableData

[NSSet superclass] NSObject

[[NSSet set] class] __NSSet0

[[NSSet set] superclass] NSSet

[NSMutableSet superclass] NSSet

[[NSMutableSet set] class] __NSCFSet

[[NSMutableSet set] superclass] NSMutableSet