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How to measure the speed of a python function

匿名 (未验证) 提交于 2019-12-03 09:06:55
可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效,请关闭广告屏蔽插件后再试): 问题: I usually write codes(functions) on www.codefights.com as a competitor.So speed is one of the important part of the code . How can i measure the speed of a certain code in python language whether it is the lambda function or a def function . 回答1: Have a look at the timeit module in pythons standard libaray: https://docs.python.org/2/library/timeit.html >>> import timeit >>> timeit.timeit('"-".join(str(n) for n in range(100))', number=10000) 0.8187260627746582 >>> timeit.timeit('"-".join([str(n) for n in range(100)])', number=10000) 0

How to limit the execution time of a function in C/POSIX?

匿名 (未验证) 提交于 2019-12-03 09:02:45
可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效,请关闭广告屏蔽插件后再试): 问题: Similar to this question , I'd like to limit the execution time of a function--preferably with microsecond accuracy--in C. I imagine that C++ exceptions could be used to achieve a result similar to this Python solution. Though it's not ideal, such an approach is wholly unavailable in plain C. I wonder, then, how might I interrupt the execution of a function after a certain time interval in C on a Posix system? For relatively simple situations a bit of silly business works just fine, but that adds a fair amount of code orthogonal to the

How does the the fibonacci recursive function “work”?

匿名 (未验证) 提交于 2019-12-03 09:02:45
可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效,请关闭广告屏蔽插件后再试): 由 翻译 强力驱动 问题: I'm new to Javascript and was reading up on it, when I came to a chapter that described function recursion. It used an example function to find the nth number of the Fibonacci sequence. The code is as follows: function fibonacci ( n ) { if ( n < 2 ){ return 1 ; } else { return fibonacci ( n - 2 ) + fibonacci ( n - 1 ); } } console . log ( fibonacci ( 7 )); //Returns 21 I'm having trouble grasping exactly what this function is doing. Can someone explain what's going on here? I'm getting stuck on the 5th line, where the function

Disable power button… or… Resume full screen in Android toddler app

匿名 (未验证) 提交于 2019-12-03 08:57:35
可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效,请关闭广告屏蔽插件后再试): 问题: I'm creating an Android app for toddlers. So, I need to lock as many buttons as possible to prevent the toddler from accessing other features of the Android device. Basically, I'm looking to reproduce the locking mechanism in popular toddler apps like "Toddler Lock". I have logic that requires the user to tap the four corners of the screen in a clockwise motion to exit the app. To show the app in full-screen I have the following in my manifest android:theme="@android:style/Theme.NoTitleBar.Fullscreen" To show the app in landscape mode only,

Hard limiting / threshold activation function in TensorFlow

匿名 (未验证) 提交于 2019-12-03 08:56:10
可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效,请关闭广告屏蔽插件后再试): 问题: I'm trying to implement a basic, binary Hopfield Network in TensorFlow 0.9. Unfortunately I'm having a very hard time getting the activation function working. I'm looking to get the very simple If net[i] < 0, output[i] = 0, else output[i] = 1 but everything I've tried seems to remove the gradient, i.e. I get the "No gradients provided for any variable" exception when trying to implement the training op. For example, I tried casting tf.less() to float , I tried doing something along the lines of tf.maximum(tf.minimum(net, 0) + 1, 0) but I

Do assemblies placed in the GAC gain full trust?

匿名 (未验证) 提交于 2019-12-03 08:46:08
可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效,请关闭广告屏蔽插件后再试): 问题: I've been hearing conflicting facts about this topic. What is correct? 回答1: You've been hearing conflicting views because it's a topic of great confusion, even among senior engineers. In short, simply placing an assembly in the GAC does implicitly give it full trust, but this can be overriden via security policy. EDIT1: Let me add that a common thought is if you don't trust an assembly fully, why are you placing it in the GAC? EDIT2: I had a link in here to a blog post from Michelle Bustamante, but as you can see in the comment below, it's

WPF - Error while calling javascript function - Unknown name. (Exception from HRESULT: 0x80020006 (DISP_E_UNKNOWNNAME))

匿名 (未验证) 提交于 2019-12-03 08:46:08
可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效,请关闭广告屏蔽插件后再试): 问题: I am using "WebBroswer" in my wpf application to render Google map. So I am calling Pan(x, y) JavaScript method with some parameters form my c# code. But I am getting this below error. Unknown name. (Exception from HRESULT: 0x80020006 (DISP_E_UNKNOWNNAME)) My Window2.xaml File: <Window x:Class="Test.Window2" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Title="Window2" Height="300" Width="300"> <Grid> <WebBrowser Name="mapBrowser" Margin="50" /> <Button Name="button1"

TypeError: $(…).selectize is not a function

匿名 (未验证) 提交于 2019-12-03 08:44:33
可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效,请关闭广告屏蔽插件后再试): 问题: I installed the "selectize-rails" gem into my rails app, and I'm trying to get it to work. I keep getting this error in my web console: TypeError: $(...).selectize is not a function and nothing happens in the browser. Here's the code I have so far, following the "Email Contacts" example from this page: http://brianreavis.github.io/selectize.js/ views/emails/new.html.erb <script type="text/javascript"> $(document).ready(function() { console.log( typeof $.fn.selectize === 'function'); // true console.log( $('#select-to').length === 1 ); //

How do Perl Cwd::cwd and Cwd::getcwd functions differ?

匿名 (未验证) 提交于 2019-12-03 08:36:05
可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效,请关闭广告屏蔽插件后再试): 问题: The question What is the difference between Cwd::cwd and Cwd::getcwd in Perl, generally, without regard to any specific platform? Why does Perl have both? What is the intended use, which one should I use in which scenarios? (Example use cases will be appreciated.) Does it matter? (Assuming I don’t mix them.) Does choice of either one affect portability in any way? Which one is more commonly used in modules? Even if I interpret the manual is saying that except for corner cases cwd is `pwd` and getcwd just calls getcwd from unistd.h , what is

Why can&#039;t I use `import *` in a function?

匿名 (未验证) 提交于 2019-12-03 08:36:05
可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效,请关闭广告屏蔽插件后再试): 问题: This works as expected def outer_func(): from time import * print time() outer_func() I can define nested functions in the context fine and call them from other nested functions: def outer_func(): def time(): return '123456' def inner_func(): print time() inner_func() outer_func() I can even import individual functions: def outer_func(): from time import time def inner_func(): print time() inner_func() outer_func() This, however, throws SyntaxError: import * is not allowed in function 'outer_func' because it contains a nested function with