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source of historical stock data [closed]
... as two different symbols, or stock splits are not properly accounted for, etc. And then you realize that historical dividend data is need as well and so you start running in circles, patching data together from 100 different data sources and so on. So to start with a "discount" data feed will do, b...
In Functional Programming, what is a functor?
...bananas, and we map the same function, we now would have a tree of apples. Etc. tree and list are two Functors here.
– Qqwy
Jun 19 '16 at 21:34
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How to securely store access token and secret in Android?
I am going to use oAuth to fetch mails and contacts from google. I don't want to ask the user each time to log in to obtain an access token and secret. From what I understood, I need to store them with my application either in a database or SharedPreferences . But I am a bit worried about security ...
App Inventor 2 云数据库配置教程 - Firebase/云数据库1/自建后台 · App Inventor 2 中文网
...assword_here
步骤2：配置Redis
编辑Redis配置文件（通常为 /etc/redis/redis.conf）：
# 设置监听端口
port 6381
# 设置密码
requirepass your_secure_password
# 开启持久化
appendonly yes
appendfilename "appendonly.aof"
# 绑定地址（根据需要调整）
bind 0.0.0....
Is there a difference between copy initialization and direct initialization?
...ed temporary. Any members of c1 that have pod-type (or members of members, etc., etc.) may not be initialized if the user supplied default constructors (if any) do not explicitly initialize them. For c2, it depends on whether there is a user supplied copy constructor and whether that appropriately i...
Change column type from string to float in Pandas
... data type you can give your datatype .what do you want like str,float,int etc.
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How to get current CPU and RAM usage in Python?
...d way of getting current system status (current CPU, RAM, free disk space, etc.) in Python? Bonus points for *nix and Windows platforms.
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How to deploy correctly when using Composer's develop / production switch?
...hat only make sense in development, like tests, fake-data-tools, debugger, etc.
5 Answers
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REST API 404: Bad URI, or Missing Resource?
...ifference, but that doesn't imply that an empty string is an error. To stretch the analogy: You could have a method String getName() that has an implementation like this: return this.name == null ? "" : this.name. That's not incorrect unless you want the client to know that this.name is null.
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Qt events and signal/slots
...e the button should function like a normal QPushButton (it can be clicked, etc). In Qt this is done by creating your own little reusable "component" (subclass of QPushButton), which reimplements QWidget::keyPressEvent. Pseudocode:
class NumericButton extends QPushButton
private void addToNumber...