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- What is Pythons equivalent of (logical-and) in an if-statement?
There is no bitwise negation in Python (just the bitwise inverse operator ~ - but that is not equivalent to not) See also 6 6 Unary arithmetic and bitwise binary operations and 6 7 Binary arithmetic operations The logical operators (like in many other languages) have the advantage that these are short-circuited That means if the first operand already defines the result, then the second
- slice - How slicing in Python works - Stack Overflow
Python slicing is a computationally fast way to methodically access parts of your data In my opinion, to be even an intermediate Python programmer, it's one aspect of the language that it is necessary to be familiar with
- What does [:-1] mean do in python? - Stack Overflow
Working on a python assignment and was curious as to what [:-1] means in the context of the following code: instructions = f readline()[:-1] Have searched on here on S O and on Google but to no avail
- operators - Python != operation vs is not - Stack Overflow
In a comment on this question, I saw a statement that recommended using result is not None vs result != None What is the difference? And why might one be recommended over the other?
- python - What is the purpose of the -m switch? - Stack Overflow
Python 2 4 adds the command line switch -m to allow modules to be located using the Python module namespace for execution as scripts The motivating examples were standard library modules such as pdb and profile, and the Python 2 4 implementation is fine for this limited purpose
- What is the python keyword with used for? - Stack Overflow
In python the with keyword is used when working with unmanaged resources (like file streams) It is similar to the using statement in VB NET and C# It allows you to ensure that a resource is "cleaned up" when the code that uses it finishes running, even if exceptions are thrown It provides 'syntactic sugar' for try finally blocks From Python
- python - How to concatenate (join) items in a list to a single string . . .
For handling a few strings in separate variables, see How do I append one string to another in Python? For the opposite process - creating a list from a string - see How do I split a string into a list of characters? or How do I split a string into a list of words? as appropriate
- python - Iterating over a dictionary using a for loop, getting keys . . .
In Python 3, the iteration has to be over an explicit copy of the keys (otherwise it throws a RuntimeError) because my_dict keys() returns a view of the dictionary keys, so any change to my_dict changes the view as well
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