What do the symbols "=" and "==" mean in python? When is each …
2023年11月25日 · 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.
python - What exactly does += do? - Stack Overflow
2011年1月30日 · This answer is too complex for the type of person who would need to ask what += means (i.e., a beginner). Your answer is not a beginner answer, not just because beginners usually don't start learning Python in an object-oriented way, but also because there are much simpler answers (like @Imran's below).
python - What does the caret (^) operator do? - Stack Overflow
2021年12月14日 · Also, a ^= b is equivalent to a = a.__ixor__(b) (where __xor__ is used as a fallback when __ixor__ is implicitly called via using ^= but does not exist). In principle, what __xor__ does is completely up to its implementation. Common use cases in Python are: Symmetric Difference of sets (all elements present in exactly one of two sets) Demo:
python - What does In [*] in IPython Notebook mean and how to …
2015年5月24日 · I use Windows 7, Python 2.7.9 plus latest version of IPython 3.1. I ran %python inside an IPython Notebook and ran the cell, instead of returning the Python version, it did not run and jumped to a new line and printed a In [*] instead of a line number. Now no line is running in ipython everything is ignored when I try to run a cell value.
What does the percentage sign mean in Python [duplicate]
2017年4月25日 · What does the percentage sign mean? It's an operator in Python that can mean several things depending on the context. A lot of what follows was already mentioned (or hinted at) in the other answers but I thought it could be helpful to provide a more extensive summary. % for Numbers: Modulo operation / Remainder / Rest. The percentage sign is an ...
What does the “at” (@) symbol do in Python? - Stack Overflow
2011年6月17日 · 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
What does asterisk * mean in Python? - Stack Overflow
I find * useful when writing a function that takes another callback function as a parameter: def some_function(parm1, parm2, callback, *callback_args): a = 1 b = 2 ...
python - What do these operators mean ... - Stack Overflow
2013年3月4日 · The // operator does Python's version of integer division. Python's integer division is not exactly the same as the integer division offered by some other languages (like C), since it rounds towards negative infinity, rather than towards zero. Together with the modulus operator, you can say that a == (a // b)*b + (a % b).
syntax - What does += mean in Python? - Stack Overflow
2010年11月1日 · The problem with the later is (aside from the leading-space), depending on the Python implementation, the Python interpreter will have to make a new copy of the string in memory every time you append (because strings are immutable), which will get progressively slower the longer the string to append is..
What does the ** maths operator do in Python? - Stack Overflow
It is the power operator.. From the Python 3 docs: The power operator has the same semantics as the built-in pow() function, when called with two arguments: it yields its left argument raised to the power of its right argument.