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demystify Flask app.secret_key
... a cryptographic hashing algorithm; only if you have the exact same secret and the original data can you recreate this value, letting Flask detect if anything has been altered without permission. Since the secret is never included with data Flask sends to the client, a client cannot tamper with sess...
数据科学组件 · App Inventor 2 中文网
...据的平均值和标准差，然后根据阈值检查每个数据点的 Z 分数。 如果数据点的 Z 分数大于阈值，则该数据点被标记为异常。
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非可视组件，应用不同回归模型的数据科学组件。（要求AI伴侣v2.68及以上）
该组件只需要一...
How to do multiple line editing?
...key combination for multi-line edits in Eclipse (or STS) is option/alt+command+A
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Is there a standard sign function (signum, sgn) in C/C++?
I want a function that returns -1 for negative numbers and +1 for positive numbers.
http://en.wikipedia.org/wiki/Sign_function
It's easy enough to write my own, but it seems like something that ought to be in a standard library somewhere.
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How to work with complex numbers in C?
...t doesn't give me much information about how to use it. How to access real and imaginary parts in an efficient way? Is there native functions to get module and phase?
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Limit ggplot2 axes without removing data (outside limits): zoom
...'t figure out how to do horizontal boxplots since that requires coord_flip and you can't have two coords.
– jtr13
Oct 5 '18 at 15:28
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Is there a way to give a specific file name when saving a file via cURL?
I am pulling files using curl in the mac OS X terminal and want to give them different names. Is there a way to specify a name, such as a "save as" function when using curl?
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What are libtool's .la file for?
...nly file that is preserved between platforms by libtool allowing to understand what happens with:
Library dependencies
Actual file names
Library version and revision
Without depending on a specific platform implementation of libraries.
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NameError: name 'self' is not defined
...ot refer each other.
It's a common pattern to default an argument to None and add a test for that in code:
def p(self, b=None):
if b is None:
b = self.a
print b
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Transaction isolation levels relation with locks on table
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I want to understand the lock each transaction isolation takes on the table
For example, you have 3 concurrent processes A, B and C. A starts a transaction, writes data and commit/rollback (depending on results). B just executes a SELECT st...