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I'm unclear about the difference between the syntax != and is not. They appear to do the same thing:
>>> s = 'a'
>>> s != 'a'
False
>>> s is not 'a'
False
But, when I use is not in a list comprehension, it produces a different result than if I use !=.
>>> s = "hello"
>>> [c for c in s if c is not 'o']
['h', 'e', 'l', 'l', 'o']
>>> [c for c in s if c != 'o']
['h', 'e', 'l', 'l']
Why did the o get included in the first list, but not the second list?
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Not Equal Operator in Python If the values compared are equal, then a value of true is returned. If the values compared are not equal, then a value of false is returned. != is the symbol we use for the not equal operator.
The = is a simple assignment operator. It assigns values from right side operands to the left side operand. While on the other hand == checks if the values of two operands are equal or not. If yes, the condition becomes true and it returns a non zero value.
You can use the not equal Python operator for formatted strings (f-strings), introduced in Python 3.6. To return an opposite boolean value, use the equal operator ==. Keep in mind that some fonts change != to look like ≠ !
The equal-to operator ( == ) returns true if both operands have the same value; otherwise, it returns false . The not-equal-to operator ( != ) returns true if the operands don't have the same value; otherwise, it returns false .
is tests for object identity, but == tests for object value equality:
In [1]: a = 3424
In [2]: b = 3424
In [3]: a is b
Out[3]: False
In [4]: a == b
Out[4]: True
is not compares references. == compares values
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