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How can I format a decimal to always show 2 decimal places?
...y, wrapping num in a tuple is a coding convention to prevent a duck typing error on arguments during string formatting. It doesn't have any effect in this case with a float conversion, but it prevents an unexpected type error when converting to strings. Consider r = 1; "%s" % r; r = (1, 2); "%s" %...
How to drop columns using Rails migration
...table_name, :column_name, :column_type. Otherwise you'll get the following error when trying to run the migration: remove_column is only reversible if given a type
– Dennis
Mar 26 '14 at 13:35
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App Inventor 2 UrsPahoMqttClient 拓展 - 物联网轻量级MQTT协议 · App Inventor 2 中文网
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由于错误或中断，无法建立连接。可以通过属性 LastErrorCode 和 LastErrorMessage 查看错误原因。
Connect
常量属性：
为了简化状态查询，已经实现了 IsConnected 和 IsDisconnected 属性：
下面的状态图解释了连接建立和...
How do I get Flask to run on port 80?
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So it's throwing up that error message because you have apache2 running on port 80.
If this is for development, I would just leave it as it is on port 5000.
If it's for production either:
Not Recommended
Stop apache2 first;
Not recommended as...
Android Crop Center of Bitmap
... targeted width
height targeted height
I was getting out of memory errors sometimes when using the accepted answer, and using ThumbnailUtils resolved those issues for me. Plus, this is much cleaner and more reusable.
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typedef struct vs struct definitions [duplicate]
... are different, defining S both in the structs and global spaces is not an error, as it is not redefining the same identifier, but rather creating a different identifier in a different place.
To make the difference clearer:
typedef struct S {
int x;
} T;
void S() { } // correct
//void T() ...
Is is possible to check if an object is already attached to a data context in Entity Framework?
I am getting the following error when trying to attach an object that is already attached to a given context via context.AttachTo(...) :
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How do you debug MySQL stored procedures?
...oesn't seem to work for FUNCTIONS and I have no idea why. It always gives "Error Code: 1415. Not allowed to return a result set from a function". Is there any recourse?
– Patrick M
Jul 28 '15 at 21:29
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Get Insert Statement for existing row in MySQL
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See this if you get the error mysqldump: Couldn't execute 'SELECT @@GTID_MODE': Unknown system variable 'GTID_MODE' (1193) gist.github.com/arun057/5556563
– Daniel Schaffer
Jul 12 '13 at 22:39
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Python - 'ascii' codec can't decode byte
I'm really confused. I tried to encode but the error said can't decode... .
7 Answers
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