Bound Python method accessed with getattr throwing:" takes no arguments (1 given) "
Python interpreter error, x takes no arguments (1 given)
find $\sum_{k=2}^{\infty}\frac{1}{k^2-1}$ What do hollow/filled stars mean in chat? I was on chat in Stack Overflow and noticed that some of the message had grey stars with a black border while others were just black stars. What is the difference between the 2 star types? How much money do you need to have on hand when entering USA? My friend, a Chilean citizen, is entering the US via waiver program to spend 3 weeks in USA in a couple of weeks. She already got her ESTA approval, the plane ticket, all hotels are already booked (but paid by me, not her).  How much money would she need to bring with her when entering US? Do they still check this? She would of course have credit cards with her. Undefined reference error for template method Does an HDR environment texture affect the Shadow pass? I am compositing a scene using a standard process in Cycles, and it worked correctly as long as I had my lighting setup in the scene, however when I switched to HDR, my Shadow pass seems to become a solid black. Why is this, and how can it be avoided?  My node setup: $S := \{x \in \Bbb R^3: ||x||_2 = 1 \}$ and $T: S^2 \to \Bbb R$ is a continuous function. Is $T$ injective? $S := \{x \in \Bbb R^3: ||x||_2 = 1 \} \subset (\Bbb R^3, || \cdot ||_2 )$ and $T:S^2 \to (\Bbb R, |\cdot |)$ is  a continuous function.  I've already shown that $$T_{\mathrm{max}} := \mathrm{sup}\{ T(x) : x \in S^2\}  \: \: \mathrm{ and }\: \: T_{\mathrm{min}}:= \mathrm{inf}\{ T(x) : x \in S^2\}$$ are reached by $T$ with the argument that $S^2$ is closed and bounded and therefore after the Heine-Borel-Theorem compact, and therefore since T is continuous it assumes its max and min in $S^2$.   Now i have answer the following:     1) Is there a point $x_0 \in S^2$ with $T(x_0)=T(-x_0)$ ?      2) Is there a value $T \in(T_{\mathrm{min}}, T_{\mathrm{max}})$ which is only assumed at exactly one point of $S^2$ ?   I wanted to show that $T$ is injective to get that 1) is false and 2) is true but i didn't get anywhere. Any ideas? Thanks in advance! Prove $(x+y) \text{ mod } n = ((x \text{ mod } n)+(y \text{ mod } n)) \text{ mod } n,\,$ and product analog For all $n \in \mathbb{N}$, $n &gt; 1$ and $x,y \in \mathbb{Z}$ prove that      \begin{equation}   (x+y) \text{ mod } n   = ((x \text{ mod } n)+(y \text{ mod } n))\text{ mod } n. \end{equation}   Would this be a proof if I say:  Let $x = x' \text{ mod } n$ and let $y=y' \text{ mod } n$. Then  \begin{equation}   x+y = x'+y' \text{ mod } n. \end{equation}  Now, if we look at the current thing we want prove, this will follow:  \begin{equation}   x+y \text { mod } n = (x \text{ mod } n + y \text{ mod } n) \text{ mod } n. \end{equation}    I'm not sure if this is allowed or will count as a "proof" at all. Maybe you can show me some other ways of doing this, more precise ones? Brownian motion - Hölder continuity How do I speed up my design work? I've been a designer for 6 months, having previously had a 1st class honours degree in Graphic Communication. My issue is that I am a Very good designer, but I work too slow. It's beginning to drive a rift between myself and the creative director who desperately wants me to work quicker. I've always been a workaholic even in university, I put in 110% all the time, really work my ass off, but I'm still not fast enough to complete projects quickly, my work is good, but it's not efficient.  Do you guys have any tips to help me speed up? Can you make multiple "if" conditions in Python? Username and Password not recognized when logging into Minecraft We just got a new laptop (ASUS) though we did have a mac.  We are trying to log onto Mojang to download Minecraft and it keeps saying, "The username and password are not recognized."   We have done all the usual procedures; we have reset the password, we are using the email, not the username to sign in, and it looks like the minecraft login servers are working etc. etc.  We quit Minecraft on the old computer and shut off that computer thinking that was the issue.   Still, we can't get onto Mojang.  We are accessing mincraft through firefox and trying to download it to the new computer but we can't get into the account to do that!  What in the world could be the issue? Any canon Shadowrun material related to NY/PA/NJ areas? I'm looking for specific, canon (i.e. official, published) references to material for the Shadowrun game-world setting. My game setting is based around the Philadelphia area; I've turned New Jersey into a radioactive swamp, then dropped a nuke in it; I've got some things established for the Philly area, and NYC.  What I want to know is whether anyone knows of specific references to published material dealing with this region. Any mention of the big apple in Shadowrun's history? Any famous names in the area, or megacorps that are mentioned? Anything at all that's part of the published SR work, that I can incorporate, or at least avoid contradicting.  If you have any home-brewed material for that area, I would love to see a link in comments, but please don't put it as an answer. Thanks! =) Why is 'that' sometimes optional before dependent clauses? I want to make a long shadow just like in this image.  I can create this shadow with shapes and by deleting the unwanted shadows after rasterizing the layer. But it's not very reusable. I can't resize the layer after rasterizing it.  Is there any easy way to make a long shadow like in the image below? Ppening an HTML file on localhost in XAMMP/apache 2.2 using subdirectories under htdocs I have a site directory for html (dreamweaver CSS3) with lots of subdirectories that contain HTML files for a number of drop down menus. They work fine where they are, but they all have menus that are JavaScript and could be kept in a separate file. So, I want to use Include. I don't want to have to FTP my files to HostGator every time I want to test the includes. I want to have this on my local machine. So, I am attempting for the first time to setup XAMMP and then run my html files (site) on localhost, so I can see what they look like before ftping everything to HostGator and putting it live.  I tried copying the main site folder to htdocs, and then copying the path to the file I want to run in front of the localhost in Firefox, but it gave me file not found:   Do I have too many subdirectories? Why isn't the file being found? It is there.  Tried this too:   No go. Why does `Position` by default return a list of lists of positions instead of a simple list of positions? verifying an incorrect integrating factor I was doing some practice problems that my professor had sent us and I have not been able to figure out one of them. The given equation is:  $-y^2dx +x^2dy = 0$  He then asks us to verify that:  $ u(x, y) = \frac{1}{(x-y)^2}$  is an integrating factor.   I multiplied through to get:  $\frac{-y^2}{(x-y)^2}dx + \frac{x^2}{(x-y)^2}dy = 0$   However, the partial derivatives of these do not equal each other so I am a bit confused... Why is the QGIS map composer grid showing unreasonable lat/lon? I need to print a map with coordinates in the format of Degree, Minute and second. CRS is set to WGS 84 (EPSG 3857) for both layers and on the project properties it is set to enable transformation on the fly. But then, when in map composer I get the following coordinates, which make no sense to me. Using the same code behind file for multiple .aspx pages Why use apparently meaningless do-while and if-else statements in macros?