Jun 16, 2012 · Python is dynamically, but strongly typed, and other statically typed languages would complain about comparing different types. There's also the else clause: # This will always print either "hi" or "no hi" unless something unforeseen happens. if hi == "hi": # The variable hi is being compared to the string "hi", strings are immutable in Python ...

Nov 29, 2011 · This clear's things up for me a bit. I was a bit confused because in Python integers are arbitrary precision by default, unlike C where we usually have integer sizes like 32 or 64 bits, so it is a bit hard to understand what binary operations mean in Python. Part of the the key insight is that in two's complement you can extend:

Suppose I have this code to do something when a is not negative number: a = 0 if a == 0 or a > 0: print(a) That is: I want to do something when a is either equal to or greater than 0 (meaning it is not a negative number). I know that I can write if a != 0: to check whether a is not equal to 0. So, I tried using if a !< 0:, following similar ...

Python checks whether the object you're referring to has the same memory address as the global None object - a very, very fast comparison of two numbers. By comparing equality, Python has to look up whether your object has an __eq__ method. If it does not, it examines each superclass looking for an __eq__ method. If it finds one, Python calls it.

You cannot use the not operator or the operator.not function on NumPy arrays because these require that these return a single bool (not an array of booleans), however NumPy also contains a logical not function that works element-wise: >>> np.logical_not(arr) array([False, True, False, True]) That can also be applied to non-boolean arrays:

Jul 18, 2017 · Also as a side not, some of your code is not doing what you think it is: if symbols == symbols.isalpha(): ... will test if symbols, your input string, is equal to the result of symbols.isalpha() which returns a boolean True or False. What you probably meant is just: if symbols.isalpha(): ... The elif statement is strange as well.

Jul 23, 2021 · The not keyword is a logical operator. The return value will be True if the statement(s) is not True and the return value will be False if the statement(s) is not False. Source. In the code above, we want the user to play until he has some guesses remaining i.e., we want the loop to execute if guesses_complete is False.

The operators is and is not test for object identity: x is y is true if and only if x and y are the same object. x is not y yields the inverse truth value. Share Improve this answer

Use the keyword and, not & because & is a bit operator. Be careful with this... just so you know, in Java and C++, the & operator is ALSO a bit operator. The correct way to do a boolean comparison in those languages is &&. Similarly | is a bit operator, and || is a boolean operator. In Python and and or are used for boolean comparisons.

May 24, 2011 · For your specific example (as Neil said in the comments), you don't have to use the subprocess module, you can simply use os.mkdir() to get the result you need, with added exception handling goodness.