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Adding :default => true to boolean in existing Rails column

... change_column is a method of ActiveRecord::Migration, so you can't call it like that in the console. If you want to add a default value for this column, create a new migration: rails g migration add_default_value_to_show_attribute Then in the migration created: # That's the more generic way t...
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What do the python file extensions, .pyc .pyd .pyo stand for?

... .py: This is normally the input source code that you've written. .pyc: This is the compiled bytecode. If you import a module, python will build a *.pyc file that contains the bytecode to make importing it again later easier (and faster). .pyo...
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Does IMDB provide an API? [closed]

...lo.json (alternate) Format: JSON-P Caveat: It's in JSON-P format, and the callback parameter can not customised. To use it cross-domain you'll have to use the function name they choose (which is in the imdb${searchphrase} format). Alternatively, one could strip or replace the padding via a local pro...
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[科普] __MACOSX是什么文件夹? - 更多技术 - 清泛网 - 专注C/C++及内核技术

[科普] __MACOSX是什么文件夹?(如图,一般的设计源文件都会有__MACOSX这个目录)以下为网上搜到的资料:MacOS作为他们的开发环境。例如,许多来自领先的网络框架组织的... (如图,一般的设计源文件都会有__MACOSX这个目录) ...
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How to deep copy a list?

... don't make a deep copy using list() (Both list(...) and testList[:] are shallow copies). You use copy.deepcopy(...) for deep copying a list. deepcopy(x, memo=None, _nil=[]) Deep copy operation on arbitrary Python objects. See the following snippet - >>> a = [[1, 2, 3], [4, 5, 6]]...
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iPhone get SSID without private library

...e(CNCopySupportedInterfaces()); NSLog(@"%s: Supported interfaces: %@", __func__, interfaceNames); NSDictionary *SSIDInfo; for (NSString *interfaceName in interfaceNames) { SSIDInfo = CFBridgingRelease( CNCopyCurrentNetworkInfo((__bridge CFStringRef)interfaceName)); ...
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Commenting in a Bash script inside a multiline command

...utput MYSQLDUMP file cat ${MYSQLDUMP} | \ # simplify the line sed '/created_at/d' | \ # create some newlines tr ",;" "\n" | \ # use some sed magic sed -e 's/[asbi]:[0-9]*[:]*//g' -e '/^[{}]/d' -e 's/""//g' -e '/^"{/d' | \ # more magic sed -n -e '/^"/p' -e '/^print_value$/,/^option_id$/p' | \ # even ...
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How to schedule a function to run every hour on Flask?

...om apscheduler.schedulers.background import BackgroundScheduler def print_date_time(): print(time.strftime("%A, %d. %B %Y %I:%M:%S %p")) scheduler = BackgroundScheduler() scheduler.add_job(func=print_date_time, trigger="interval", seconds=3) scheduler.start() # Shut down the scheduler when ...
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Android: View.setID(int id) programmatically - how to avoid ID conflicts?

I'm adding TextViews programmatically in a for-loop and add them to an ArrayList. 14 Answers ...
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Adding days to a date in Python

... The previous answers are correct but it's generally a better practice to do: import datetime Then you'll have, using datetime.timedelta: date_1 = datetime.datetime.strptime(start_date, "%m/%d/%y") end_date = date_1 + datetime.timedelta(days=10) ...