Python,:

No switch keyword. And NO, dictionary is not a replacement for it. Not even a bunch of elif statements. Inconsistent line break handling. Why can I do: test = (1, 2, 3) And not: from itertools import cycle, islice, izip Why can't I do: if stuff \ and foo \ or bar: return "Formated string with %(arg)s" % \ {'arg': "bloody slash"} without using slashes? There is not one obvious and only one way to do it. Python fails on its motto just like Java failed on "Write once run anywhere". # what somebody from an another language would do if not test.has_key('foo'): test['foo'] = 0 n = test['foo'] = test['foo'] + 1 vs # what an agnostic beginer would do try: test['foo'] += 1 except KeyError: test['foo'] = 1 n = test['foo'] vs # what you end up after looking for dictionary default value in the python doc test.setdefault('foo', 0) n = test['foo'] = test['foo'] + 1 vs # what I would do n = test['foo'] = test.get('foo', 0) + 1 And the worst is that they don't do exactly the same thing. There are subtle differences. Choice between spaces and tabs. There should be no choice. Pick on, set it in stone and stop fighting. Why can you do that: test = {} test['foo'] = 0 but not: test = [] test[] = 0

附注:" ".join(l)是优秀的人。不要抱怨它，这并不明显，但考虑到迭代器模式，这是正确的方法。

Java

已检查的异常 类型擦除 缺少操作符重载(例如BigInteger/BigDecimal) 缺少regexp/date/duration /复杂文字 对不可变性的支持很差

Haskell

Sometimes the type system feels backwards. What if I don't want the compiler to infer types for my variables? What if I want the opposite, where it does constraint checking on said variables? For example, instead of inferring the type of the elements of a list, it instead makes sure that they all belong to a particular typeclass. This is a subtle but huge difference that makes it difficult for me to program UIs. It can be done, but it takes more effort than it does in some other languages. Haskell rocks for the non-UI parts, but the UI I leave to an untyped language. Allowing the construction of infinite values leads to some really frustrating errors sometimes. NoMonomorphismRestriction. Bytestring handling bites me in the ass sometimes and you don't know it until your program crashes because you mixed them up improperly. Something is wrong here, when we are losing type information that should have prevented this. Typeclasses should be automatically derived for trivial cases, like witness types, but there's a strong potential for abuse there.

C#

我对c#非常满意，但这两个真的让我很恼火:

Constructor-based initialization for immutable classes is less convenient, less intuitive (when you read the code you don't understand what you assign to what), has less IDE backing than inline object initialization. This makes you lean towards mutable classes inevitably. I know this has been mentioned before, but I strictly have problems with initialization syntax for immutable classes. switch is too verbose. Whenever I see a situation where a switch would be proper, I'm really inclined to use an if..else if.. just because it's more terse (~30% less typing). I think there should be no fallthrough for switch, break should be implied, and case should allow comma separated list of values.

objective - c 2.0

严格遵循语言和运行时，而不是库，并且没有任何特定的顺序:

Lack of cVars. No modules. I'm not terribly unhappy with a lack of namespaces, but modules would be nice to have. Ivar-based property syntax requires declarations using the variable name in 3 places. It's fairly hideous. C heritage. Anything to hate about the C language, except for OO and GC, is present. Objects can't live on the stack. Not a problem with Obj-C so much as what it does to programming practices in other languages. I find it strange when I get a return value on the stack in C++, for instance. If I'm not actually looking at the library documentation when I write the code, I'll assume that every function returns a pointer, which often makes for some siginificant cleanup later.

Delphi(又名Object Pascal)，我将讨论本机版本，而不是。net。

Var块! 语言中的接口在设计时就考虑到了COM的使用——因此比c#或Java要复杂得多。ie。涉及引用计数，除非显式禁用它。 没有尝试，只有最终结束; 对象创建过于显式: var obj: TMyObject; .．. obj:= TMyObject.Create; 试一试 .．. 最后 obj.Free; 结束;

而是像这样

auto obj: TMyObject; // compiler adds the default constructor call and the destructor call in a try/finally block. 

好吧，语言太好了，我真的想不出更多，所以我在这里强迫自己:内置类型，如字符串，整数..或者枚举最好有方法。ie。i. tostring代替IntToStr(i)。