大约有 48,000 项符合查询结果（耗时：0.0602秒） [XML]
MongoDB not equal to
...8b1a7768972d396fe2268"), "author" : "you", "post" : "how to query" }
And now $not, which takes in predicate ($ne) and negates it ($not):
db.test.find({'post': {$not: {$ne : ""}}})
{ "_id" : ObjectId("4f68b19c768972d396fe2267"), "author" : "me", "post" : "" }
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How can I remove the first line of a text file using bash/sed script?
...il
Shell redirects stdout of the tail process to $FILE
tail reads from the now empty $FILE
If you want to remove the first line inside the file, you should use:
tail -n +2 "$FILE" > "$FILE.tmp" && mv "$FILE.tmp" "$FILE"
The && will make sure that the file doesn't get overwrit...
Multiple levels of 'collection.defaultdict' in Python
... DeepDict instance itself a valid factory for constructing missing values. Now we can do things like
dd = DeepDict(DeepDict(list))
dd[1][2].extend([3,4])
sum(dd[1][2]) # 7
ddd = DeepDict(DeepDict(DeepDict(list)))
ddd[1][2][3].extend([4,5])
sum(ddd[1][2][3]) # 9
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Selecting the first “n” items with jQuery
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Can't edit now sorry -- basically, using slice was a lot faster.
– nickf
Oct 29 '13 at 13:13
add a comment
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Removing duplicates in lists
...weren't duplicated/removed. This is what I have but to be honest I do not know what to do.
50 Answers
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ReSharper - force curly braces around single line
...be added; if unchecked, braces will be removed.
Note: adding doesn't work now (don't know why - perhaps, too fresh version of ReSharper). However, if you will uncheck the mentioned item, the existent braces around single statements will not be removed.
UPD: The problem solved, see the first two co...
Using javadoc for Python documentation [closed]
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Have a look at the reStructuredText (also known as "reST") format, which is a plaintext/docstring markup format, and probably the most popular in the Python world. And you should certainly look at Sphinx, a tool to generate documentation from reStructuredText (used fo...
Using pg_dump to only get insert statements from one table within database
...ions were removed from PostgreSQL 8.4 (see 8.4.0 release notes). You must now use the "long" names: pg_dump --column-inserts --data-only --table=<table> <database>
– Matthew Wood
May 18 '10 at 14:49
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Replace all 0 values to NA
...e number of elements so that there can be no "holes" (i.e., NULL values).
Now you could replace zeroes by NULL in a data frame in the sense of completely removing all the rows containing at least one zero. When using, e.g., var, cov, or cor, that is actually equivalent to first replacing zeroes wit...
What is an IIS application pool?
... take or also ready to host another website say xyz.com(ecommerce based).
Now web server is hosting i.e providing memory to run both websites on its single web server.Thus , here application pools come into picture .
abc.com has its own rules, business logic , data etc and same applies to xyz.com.
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