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Parse date string and change format
...
convert string to datetime object
from datetime import datetime
s = "2016-03-26T09:25:55.000Z"
f = "%Y-%m-%dT%H:%M:%S.%fZ"
out = datetime.strptime(s, f)
print(out)
output:
2016-03-26 09:25:55
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SparseArray vs HashMap
...rally slower, not indicated for large collections
They won't work in a non-Android project
HashMap can be replaced by the following:
SparseArray <Integer, Object>
SparseBooleanArray <Integer, Boolean>
SparseIntArray <Integer, Integer>
SparseLongArray <In...
surface plots in matplotlib
...ceforge.net/mpl_examples/mplot3d/surface3d_demo.py
here's pythonic way to convert your 3-tuples to 3 1d arrays.
data = [(1,2,3), (10,20,30), (11, 22, 33), (110, 220, 330)]
X,Y,Z = zip(*data)
In [7]: X
Out[7]: (1, 10, 11, 110)
In [8]: Y
Out[8]: (2, 20, 22, 220)
In [9]: Z
Out[9]: (3, 30, 33, 330)
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Why does C++ require a user-provided default constructor to default-construct a const object?
The C++ standard (section 8.5) says:
5 Answers
5
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Shared-memory objects in multiprocessing
...ray_base = multiprocessing.RawArray(ctype, np.prod(dimensions))
# convert to numpy array vie ctypeslib
self.shared_arrays[self.cur] = np.ctypeslib.as_array(shared_array_base)
# do a reshape for correct dimensions
# Returns a masked array containing the s...
'0000-00-00 00:00:00' can not be represented as java.sql.Timestamp error
...ration:
jdbc:mysql://yourserver:3306/yourdatabase?zeroDateTimeBehavior=convertToNull
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Is there a common Java utility to break a list into batches?
...s [[a, b, c], [d, e]] -- an outer list containing two inner lists of three and two elements, all in the original order.
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Foreign Key to multiple tables
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You have a few options, all varying in "correctness" and ease of use. As always, the right design depends on your needs.
You could simply create two columns in Ticket, OwnedByUserId and OwnedByGroupId, and have nullable Foreign Keys to each table.
You could create M:M referen...
Inner class within Interface
... "static inner class": this simply makes no sense, there's nothing "inner" and no "outter" class when a nested class is static, so it cannot be "static inner").
Anyway, the following compiles fine:
public interface A {
class B {
}
}
I've seen it used to put some kind of "contract checker...
Why Choose Struct Over Class?
...n many circumstances.
Structs are preferable if they are relatively small and copiable because copying is way safer than having multiple references to the same instance as happens with classes. This is especially important when passing around a variable to many classes and/or in a multithreaded env...