Python:

没有分隔符表示块的结束会导致歧义，这样自动缩进就不能处理格式不佳的代码。 没有宏(修饰符不算) 没有像haskell的cabal或perl的CPAN那样的库自动获取 不能声明变量const(是的，可以自己定义变量，但是…) 元编程被削弱 差点忘了全局解释器锁

第一个帖子，所以对我放松点:)…很棒的社区网站，顺便说一句!

我试着阅读其他所有的c#回复，这样我的回复就不会重叠了

c#……排名不分先后:

1) switch语句中的case没有fallthrough。如果没有转机……为什么必须显式的类型中断;呢?这只是弱智和令人困惑，因为它意味着没有休息的能力;!!

2)不能在子作用域中声明同名变量，但可以声明与类变量同名的变量?要么都允许，要么都不允许。否则，就没有意义了。

3)函数中没有可选/默认参数

4) finally{}中的异常应该隐式地捕捉每一行。或者至少，只有NullReferenceException异常。例如，在访问数据库后，应该总是清理。所以，finally块应该看起来像这样:

finally
{
  if(par1 != null)
    par1.Dispose();
  if(comm != null)
    comm.Dispose();
  if(conn != null)
    conn.Dispose();
}

如果可以写成这样，就会简洁得多:

finally
{
    par1.Dispose();
    comm.Dispose();
    conn.Dispose();
}

但是，不……你必须检查你是否正在访问一个空对象，否则它可能会从finally块抛出一个NullReferenceException。谁真的需要finally块中的异常呢?

5)泛型:你可以指定new()来实例化你的泛型对象，但是这个对象需要有一个默认构造函数。为什么不能指定一个签名，这样就不需要在还没有空构造函数的情况下创建空构造函数，而只使用已有的构造函数。

c# / .net:

Classes should be sealed by default There should be no lock statement - instead, you should have specific locking objects, and there should be methods such as Acquire which return disposable lock tokens. Corollary: there shouldn't be a monitor for every object. GetHashCode() and Equals() shouldn't be in System.Object - not everything's suitable for hashing. Instead, have an IdentityComparer which does the same thing, and keep the IComparer<T>, IComparable<T>, IEqualityComparer<T> and IEquatable<T> interfaces for custom comparisons. Poor support for immutability Poor way of discovering extension methods - it should be a much more conscious decision than just the fact that I'm using a namespace.

这些都是我想出来的，明天问我，我会想出一个不同的5个:)

Python

错误/异常在调试时是模糊的 我工作时不用 在类中使用__init__， __repr__， __str__等 不能简单地编译可执行文件(.exe或其他) 还有一件事我还没试过，但肯定会让我心烦

对于所有的c语言程序员来说，self对我来说更有意义，因为对象引用的是它的self

我不敢相信，我最讨厌的Python竟然还没被提到:

(Prior to 3.x) Relative imports look like absolute imports. import foo Does this import foo from the directory you're standing in or from the sys.path? Zipped eggs, leading to a sys.path full of shite. Zipped eggs means you can't use grep and find (to among other things debug problem 1)! Fortunately, there's pip. Use pip. Some of the included batteries are unpythonic. It grates to use them. Might be the fault of distro's and packagers, but still: sourcefile-encoding set to fscking ASCII on install/compile. WTF? Means I have to put the "# coding: UTF-8"-stuff in every single .py I ever make.

Py3k解决了我的其他几个讨厌的问题，例如坚持字符串是unicode的，8位的东西是不同的……

Python:

Too slow! list operations don't return the list, so you can't do list.append(4).append(5). (I mean a reference to the same list, not a copy). This is a minor gripe; it's only come up a few times. statements don't return values (if, print, while, for, etc). This is only a problem when dealing with lambdas. lambdas can only be one expression. There's no real need for this restriction, as they are equivalent to functions in every other way. What if I want a button press event which calls two functions? I'd need to create a named function to supply that functionality to an action listener, while doing "lambda: f1(); f2()" would not hurt. you can only put standard a-zA-Z_0-9 as names. Having functions like "true?" and "+" would be great. Of course, this could lead to terrible obfuscation, but I'm not saying we immediately rename all functions to "p@$%3". Which do you find clearer to read: "dec2bin" or "dec->bin"? ("store_results" or "storeResults") or "store-results"?