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x = 4 tells Python that x is equal to 4. Nothing else is displayed because it is just a command. x == 4 on the other hand is asking if x is equal to 4. When we ask a question, the Python shell will tell us the answer, so it prints True.
Jan 30, 2011 · 180. += adds another value with the variable's value and assigns the new value to the variable. -=, *=, /= does similar for subtraction, multiplication and division. Note that, as the currently most upvoted answer details, x += y is not the same thing as x = x + y, especially if x is a list.
Jan 17, 2013 · Simply -> is introduced to get developers to optionally specify the return type of the function. See Python Enhancement Proposal 3107. This is an indication of how things may develop in future as Python is adopted extensively - an indication towards strong typing - this is my personal observation.
Dec 14, 2021 · For example, in some languages the ^ symbol means exponentiation. You could do that this way, just as one example: class Foo(float): def __xor__(self, other): return self ** other. Then something like this will work, and now, for instances of Foo only, the ^ symbol will mean exponentiation.
Mar 21, 2023 · 124. This symbol := is an assignment operator in Python (mostly called as the Walrus Operator). In a nutshell, the walrus operator compresses our code to make it a little shorter. Here's a very simple example: # without walrus. n = 30. if n > 10: print(f"{n} is greater than 10") # with walrus.
When slicing in Python the third parameter is the step. As others mentioned, see Extended Slices for a nice overview. With this knowledge, [::3] just means that you have not specified any start or end indices for your slice.
Jun 17, 2011 · 26. If you are referring to some code in a python notebook which is using Numpy library, then @ operator means Matrix Multiplication. For example: import numpy as np def forward (xi, W1, b1, W2, b2): z1 = W1 @ xi + b1 a1 = sigma (z1) z2 = W2 @ a1 + b2 return z2, a1. answered Nov 7, 2018 at 6:08.
Apr 25, 2017 · The % does two things, depending on its arguments. In this case, it acts as the modulo operator, meaning when its arguments are numbers, it divides the first by the second and returns the remainder. 34 % 10 == 4 since 34 divided by 10 is three, with a remainder of four.
Aug 31, 2008 · Unpacking with ** is also useful when using python str.format. This is somewhat similar to what you can do with python f-strings f-string but with the added overhead of declaring a dict to hold the variables (f-string does not require a dict). Quick Example
Mar 4, 2013 · This one is simple! The % operator is mostly to find the modulus of two integers. a % b returns the remainder after dividing a by b. Unlike the modulus operators in some other programming languages (such as C), in Python a modulus it will have the same sign as b, rather than the same sign as a.
