python不等于运算符的具体使用
python not equal operator returns true if two variables are of same type and have different values, if the values are same then it returns false.
如果两个变量具有相同的类型并且具有不同的值 ,则python不等于运算符将返回true ;如果值相同,则它将返回false 。
python is dynamic and strongly typed language, so if the two variables have the same values but they are of different type, then not equal operator will return true.
python是动态的强类型语言,因此,如果两个变量具有相同的值,但它们的类型不同,则不相等的运算符将返回true 。
python不等于运算符 (python not equal operators)
operator | description |
---|---|
!= | not equal operator, works in both python 2 and python 3. |
<> | not equal operator in python 2, deprecated in python 3. |
操作员 | 描述 |
---|---|
!= | 不是equal运算符,可在python 2和python 3中使用。 |
<> | 在python 2中不等于运算符,在python 3中已弃用。 |
python 2示例 (python 2 example)
let's see some examples of not-equal operator in python 2.7.
我们来看一些python 2.7中不等于运算符的示例。
$ python2.7 python 2.7.10 (default, aug 17 2018, 19:45:58) [gcc 4.2.1 compatible apple llvm 10.0.0 (clang-1000.0.42)] on darwin type "help", "copyright", "credits" or "license" for more information. >>> 10 <> 20 true >>> 10 <> 10 false >>> 10 != 20 true >>> 10 != 10 false >>> '10' != 10 true >>>
python 3示例 (python 3 example)
here is some examples with python 3 console.
这是python 3控制台的一些示例。
$ python3.7 python 3.7.0 (v3.7.0:1bf9cc5093, jun 26 2018, 23:26:24) [clang 6.0 (clang-600.0.57)] on darwin type "help", "copyright", "credits" or "license" for more information. >>> 10 <> 20 file "<stdin>", line 1 10 <> 20 ^ syntaxerror: invalid syntax >>> 10 != 20 true >>> 10 != 10 false >>> '10' != 10 true >>>
we can use python not equal operator withf-strings too if you are using python 3.6 or higher version.
如果您使用的是python 3.6或更高版本,我们也可以将python不等于运算符与f字符串一起使用。
x = 10 y = 10 z = 20 print(f'x is not equal to y = {x!=y}') flag = x != z print(f'x is not equal to z = {flag}') # python is strongly typed language s = '10' print(f'x is not equal to s = {x!=s}')
output:
输出:
x is not equal to y = false
x is not equal to z = true
x is not equal to s = true
python不等于自定义对象 (python not equal with custom object)
when we use not equal operator, it calls __ne__(self, other) function. so we can define our custom implementation for an object and alter the natural output.
当我们使用不等于运算符时,它将调用__ne__(self, other)函数。 因此,我们可以为对象定义自定义实现并更改自然输出。
let's say we have data class with fields – id and record. when we are using the not-equal operator, we just want to compare it for record value. we can achieve this by implementing our own __ne__() function.
假设我们有带字段的data类-id和record。 当我们使用不等于运算符时,我们只想比较它的记录值。 我们可以通过实现自己的__ne __()函数来实现这一点。
class data: id = 0 record = '' def __init__(self, i, s): self.id = i self.record = s def __ne__(self, other): # return true if different types if type(other) != type(self): return true if self.record != other.record: return true else: return false d1 = data(1, 'java') d2 = data(2, 'java') d3 = data(3, 'python') print(d1 != d2) print(d2 != d3)
output:
输出:
false
true
notice that d1 and d2 record values are same but “id” is different. if we remove __ne__() function, then the output will be like this:
请注意,d1和d2记录值相同,但“ id”不同。 如果删除__ne __()函数,则输出将如下所示:
true
true
翻译自: https://www.journaldev.com/25101/python-not-equal-operator
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