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Efficient way to remove keys with empty strings from a dict
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Python 2.X
dict((k, v) for k, v in metadata.iteritems() if v)
Python 2.7 - 3.X
{k: v for k, v in metadata.items() if v is not None}
Note that all of your keys have values. It's just that some of those values are the empty str...
Web scraping with Python [closed]
...om bs4 import BeautifulSoup
soup = BeautifulSoup(urllib2.urlopen('http://example.com').read())
for row in soup('table', {'class': 'spad'})[0].tbody('tr'):
tds = row('td')
print tds[0].string, tds[1].string
# will print date and sunrise
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How to get the last N records in mongodb?
... sort in ascending order.
Assuming you have some id or date field called "x" you would do ...
.sort()
db.foo.find().sort({x:1});
The 1 will sort ascending (oldest to newest) and -1 will sort descending (newest to oldest.)
If you use the auto created _id field it has a date embedded in it ......
Convert Year/Month/Day to Day of Year in Python
... answered Mar 8 '09 at 9:27
DzinXDzinX
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Stop all active ajax requests in jQuery
I have a problem, when submitting a form all active ajax request fail, and that triggers error event.
16 Answers
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WPF and initial focus
...er.FocusedElement="{Binding ElementName=SomeElement}">
<DataGrid x:Name="SomeElement">
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</DataGrid>
</Window>
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How to check for null in Twig?
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Depending on what exactly you need:
is null checks whether the value is null:
{% if var is null %}
{# do something #}
{% endif %}
is defined checks whether the variable is defined:
{% if var is not defined %}
{# do something #}
{% ...
how to ignore namespaces with XPath
My goal is to extract certain nodes from multiple xml files with multiple namespaces using XPath. Everything works fine as long as i know the namespace URIs. The namespace name itself remains constant, but the Schemas (XSD) are sometimes client-generated i.e. unknown to me. Then i am left with basic...
Sorting 1 million 8-decimal-digit numbers with 1 MB of RAM
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Hide grid row in WPF
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UpVoted - Converters permit all this to be declarative in Xaml. I generally hate using code-behind to fiddle with visual stuff.
– Allen
May 22 '14 at 13:43
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