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• cd doesn't change directory in Windows 7

  - by astay13

  I am working with cmd.exe on Windows 7 (as opposed to Powershell). I have 2 partitions on my drive, C contains the OS and installed programs, and D contains my data. I was trying to cd from C to D, but cmd wouldn't let me: C:\>cd D:\ C:\> However, when I type dir D:\, it will list the contents of D correctly. Why does it do this and how can I fix it? Powershell works fine so I can use that, but I would like to know what makes cmd misbehave.

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• Python equivalent of Java's compareTo()

  - by astay13

  I'm doing a project in Python (3.2) for which I need to compare user defined objects. I'm used to OOP in Java, where one would define a compareTo() method in the class that specifies the natural ordering of that class, as in the example below: public class Foo { int a, b; public Foo(int aa, int bb) { a = aa; b = bb; } public int compareTo(Foo that) { // return a negative number if this < that // return 0 if this == that // return a positive number if this > that if (this.a == that.a) return this.b - that.b; else return this.a - that.a; } } I'm fairly new to classes/objects in Python, so I'd like to know what is the "pythonic" way to define the natural ordering of a class?

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