I’m trying to understand how Python handles using multiple sequential operators to add and subtract numbers. Here is an example of what I mean: I don’t understand what decides whether to add or subtract these two integers. I’ve used Python 3.11.1 for this example. Answer To understand how those expressions are evaluated you can use the ast (abstract syntax tree)
Tag: operators
python – weird results with exponent operator in idle
I’m getting a strange result when squaring -1 in idle. What’s going on? Unexpected result: Expected result: Answer Operator precedence (the – is a unary minus operator):
Delete specific strings from pandas dataframe with operators chaining
I want to delete specific strings with regular expressions from the column Sorte which I don’t want to have in my dataframe file_df with the following code: But somehow when I execute this code these strings still are in the dataset and I can not figure out why. I wanted to chain this expression to not create so many copies.
How is floor division not giving result according to the documented rule?
Why floor division is not working according to the rule in this case? p.s. Here Python is treating 0.2 as 0.20000000001 in the floor division case So (12/0.2000000001) is resulting in 59.999999… And floor(59.999999999) outputting 59 But don’t know why python is treating 0.2 as 0.2000000001in the floor division case but not in the division case? Answer The reason why
Invalid syntax using += operator [duplicate]
This question already has answers here: UnboundLocalError trying to use a variable (supposed to be global) that is (re)assigned (even after first use) (14 answers) Closed 5 months ago. I keep getting a syntax error when using += in python here is my code. I am also having troule with nonlocal. I am getting lots of errors including syntax errors
New operators in Python
We can define intrinsic operators of Python as stated here. Just for curiosity, can we define new operators like $ or ***? (If so, then we can define ternary condition operators or rotate operators.) Answer Expanding on @fasouto answer, but adding a bit more code. While you cannot define new operators AND you cannot redefine existing operators for built-in types,
Is there a short-hand for nth root of x in Python?
In maths, if I wish to calculate 3 to the power of 2 then no symbol is required, but I write the 2 small: 3². In Python this operation seems to be represented by the ** syntax. If I want to go the other direction and calculate the 2nd root of 9 then in maths I need to use a
Is there a “not equal” operator in Python?
How would you say does not equal? Like Is there something equivalent to == that means “not equal”? Answer Use !=. See comparison operators. For comparing object identities, you can use the keyword is and its negation is not. e.g.
Does Python have a ternary conditional operator?
Want to improve this post? Provide detailed answers to this question, including citations and an explanation of why your answer is correct. Answers without enough detail may be edited or deleted. Is there a ternary conditional operator in Python? Answer Yes, it was added in version 2.5. The expression syntax is: First condition is evaluated, then exactly one of either