`<>` 在 Python 中是什么意思？
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What does `<>` mean in Python?
提问by michaelmeyer
I'm trying to use in Python 3.3 an old library (dating from 2003!). When I import it, Python throws me an error because there are <>signs in the source file, e.g.:
我正在尝试在 Python 3.3 中使用一个旧库（可追溯到 2003 年！）。当我导入它时，Python 会抛出一个错误，因为<>源文件中有符号，例如：
if (cnum < 1000 and nnum <> 1000 and ntext[-1] <> "s":
...
I guess it's a now-abandoned sign in the language.
我想这是该语言中现已废弃的标志。
What exactly does it mean, and which (more recent) sign should I replace it with?
它到底是什么意思，我应该用哪个（最近的）标志替换它？
采纳答案by jamylak
It means not equal to. It was taken from ABC(python's predecessor) see here:
不等于的意思。它取自ABC（python 的前身），请参见此处：
x < y, x <= y, x >= y, x > y, x = y, x <> y, 0 <= d < 10Order tests (
<>means 'not equals')
x < y, x <= y, x >= y, x > y, x = y, x <> y, 0 <= d < 10订单测试（
<>表示“不等于”）
I believe ABCtook it from Pascal, a language Guido began programming with.
我相信ABC它来自 Pascal，这是 Guido 开始使用的一种语言。
It has now been removed in Python 3. Use !=instead. If you are CRAZYyou can scrap !=and allow only <>in Py3K using this easter egg:
它现在已在 Python 3 中删除。!=改为使用。如果你很疯狂，你可以使用这个复活节彩蛋废弃!=并只允许<>在 Py3K 中：
>>> from __future__ import barry_as_FLUFL
>>> 1 <> 2
True
回答by Peter Varo
It means NOT EQUAL, but it is deprecated, use !=instead.
这意味着 NOT EQUAL，但它已被弃用，请!=改用。
回答by lvc
It is an old way of specifying !=, that was removed in Python 3. A library old enough to use it likely runs into various otherincompatibilities with Python 3 as well: it is probably a good idea to run it through 2to3, which automatically changes this, among many other things.
这是一种旧的指定方式，!=在 Python 3 中被删除。一个足够老的库使用它也可能遇到与 Python 3 的各种其他不兼容问题：通过2to3运行它可能是一个好主意，它会自动改变这一点，等等。
回答by Colonel Panic
It's worth knowing that you can use Python itself to find documentation, even for punctuation mark operators that Google can't cope with.
值得知道的是，您可以使用 Python 本身来查找文档，即使是 Google 无法应对的标点符号运算符。
>>> help("<>")
Comparisons
Unlike C, all comparison operations in Python have the same priority, which is lower than that of any arithmetic, shifting or bitwise operation. Also unlike C, expressions like
a < b < chave the interpretation that is conventional in mathematics:Comparisons yield boolean values:
TrueorFalse.Comparisons can be chained arbitrarily, e.g.,
x < y <= zis equivalent tox < y and y <= z, except thatyis evaluated only once (but in both caseszis not evaluated at all whenx < yis found to be false).The forms
<>and!=are equivalent; for consistency with C,!=is preferred; where!=is mentioned below<>is also accepted. The<>spelling is considered obsolescent.
比较
与 C 不同，Python 中的所有比较操作都具有相同的优先级，低于任何算术、移位或按位运算的优先级。同样与 C 不同的是，like 表达式
a < b < c具有数学中的常规解释：比较产生布尔值：
True或False。比较可以任意链接，例如，
x < y <= z等价于x < y and y <= z，除了y只计算一次（但在这两种情况下z，当x < y发现为假时根本不计算）。形式
<>和!=是等价的；为了与 C 一致，!=优先考虑；!=下面提到的地方<>也被接受。该<>拼写被认为是过时的。
See http://docs.python.org/2/reference/expressions.html#not-in
回答by Ehsan
Use !=or <>. Both stands for not equal.
使用!=或<>。两者都代表不相等。
[Reference: Python language reference]
The comparison operators <>and !=are alternate spellings of the same operator. !=is the preferred spelling; <>is obsolescent.
[参考：Python 语言参考] 比较运算符<>和!=是同一运算符的替代拼写。!=是首选拼写；<>已经过时了。
