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"logical operator" behaves unexpectedly in python


By : Poul Leonardo
Date : September 16 2020, 03:00 PM
With these it helps If you use >, <, >=, or <= on strings, they get compared by their ASCII value. The ASCII value of 'a' is 97, 'b' is 98, and 'A' is 65. So A is lower than a, because it's earlier in the ASCII table.
code :


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"is" operator behaves unexpectedly with integers


By : wenhowying
Date : March 29 2020, 07:55 AM
may help you . Why does the following behave unexpectedly in Python? , Take a look at this:
code :
>>> a = 256
>>> b = 256
>>> id(a)
9987148
>>> id(b)
9987148
>>> a = 257
>>> b = 257
>>> id(a)
11662816
>>> id(b)
11662828

python, regular expressions, named groups and "logical or" operator


By : user1066366
Date : March 29 2020, 07:55 AM
Any of those help In python regular expression, named and unnamed groups are both defined with '(' and ')'. This leads to a weird behavior. Regexp , Use (?:) to get rid of the unnamed group:
code :
r"(?:(?P<a>1)=(?P<b>2))|(?P<c>3)"
r"(?P<a>1)=(?P<b>2)|(?P<c>3)"

Python syntax for logical operator "and"


By : Steven Sheard
Date : March 29 2020, 07:55 AM
I hope this helps you . The and should be on the same line. Your if statement finished after the :, so all conditions should be written between the if and the :
It should look like this:
code :
if (loginname in credentials) and (credentials[username] == password):
    print("\n Login successful \n")
else:
    print("\n User doesn't exist or wrong password \n")

Nullable bool logical "AND" operator behaves differently with true and false


By : user2264674
Date : March 29 2020, 07:55 AM
wish helps you The purpose of null in this is case is to identity an unknown value. In three-valued logic, the purpose of the unknown value is to indicate that we do not know anything about the truthy or the falsy of a predicated.
false AND unknown returns false because it is not important to know what the second operator is. This is due to the and operator nature that requires both the operands to be true to return true. As we know that the first operand is false, the rest is irrelevant, and the result is false.

What is the difference between ''and' logical operator and "&" bitwise operator in this case of Python?


By : meghana
Date : March 29 2020, 07:55 AM
should help you out In logical and operator, if the first expression is falsey it will not evaluate the second expression. Since exists("") fails, os.path.getsize("") is never executed in the first case.
But in the bitwise & operator's case, both the operands have to evaluated, to get the result. And since you cannot stat an invalid file (to get the size) it fails with an error.
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