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Python unittest - opposite of assertRaises?
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def run_test(self):
try:
myFunc()
except ExceptionType:
self.fail("myFunc() raised ExceptionType unexpectedly!")
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Drop unused factor levels in a subsetted data frame
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Also: this method does preserve the ordering of the variable.
– webelo
Jul 1 '16 at 0:36
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show 1 mor...
ORA-00979 not a group by expression
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No, you do not need to put them in your order by clause
– Xaisoft
Oct 5 '09 at 15:10
3
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Match multiline text using regular expression
...is easier to read, but you need to look for the (?s) or DOTALL modifier in order to find out whether newlines are included or not. I'd prefer . with the Pattern.DOTALL flag set (this is easier to read and remember than (?s) in my opinion. You should use what you feel most comfortable with.
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How to convert list of tuples to multiple lists?
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xs, ys = [x for x, y in zs], [y for x, y in zs]
return xs, ys
if __name__ == '__main__':
from timeit import timeit
setup_string='''\
N = 2000000
xs = list(range(1, N))
ys = list(range(N+1, N*2))
zs = list(zip(xs, ys))
from __main__ import t1, t2, t3
'''
print(f'zip:\t\t{timeit(...
Postgres and Indexes on Foreign Keys and Primary Keys
...n ('pg_catalog', 'pg_toast')
and pg_catalog.pg_table_is_visible(c.oid)
order by
n.nspname
,t.relname
,c.relname
If you want to delve further (such as columns and ordering), you need to look at pg_catalog.pg_index. Using psql -E [dbname] comes in handy for figuring out how to query...
Get ID of last inserted document in a mongoDB w/ Java driver
...me", "Matt" );
collection.insert( doc );
ObjectId id = (ObjectId)doc.get( "_id" );
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Is there a list of screen resolutions for all Android based phones and tablets? [closed]
...arsed list of screens:
From http://www.emirweb.com/ScreenDeviceStatistics.php
####################################################################################################
# Filter out same-sized same-dp screens and width/height swap.
#####################################################...
decorators in the python standard lib (@deprecated specifically)
...ed
when the function is used."""
@functools.wraps(func)
def new_func(*args, **kwargs):
warnings.simplefilter('always', DeprecationWarning) # turn off filter
warnings.warn("Call to deprecated function {}.".format(func.__name__),
category=DeprecationW...
The tilde operator in Python
...s operator.invert. To support this operator in your own class, give it an __invert__(self) method.
>>> import operator
>>> class Foo:
... def __invert__(self):
... print 'invert'
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>>> x = Foo()
>>> operator.invert(x)
invert
>>> ~x
invert
Any ...