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How to select rows from a DataFrame based on column values?
...ne two three two two one three'.split(),
'C': np.arange(8), 'D': np.arange(8) * 2})
print(df)
# A B C D
# 0 foo one 0 0
# 1 bar one 1 2
# 2 foo two 2 4
# 3 bar three 3 6
# 4 foo two 4 8
# 5 bar two 5 10
# 6 foo one 6 12
# 7...
Pandas index column title or name
...ex via its name property
In [7]: df.index.name
Out[7]: 'Index Title'
In [8]: df.index.name = 'foo'
In [9]: df.index.name
Out[9]: 'foo'
In [10]: df
Out[10]:
Column 1
foo
Apples 1
Oranges 2
Puppies 3
Ducks 4
...
Ruby on Rails and Rake problems: uninitialized constant Rake::DSL
...e .9.0 breaks Rails and several other things, you need to:
gem "rake", "0.8.7"
in your Gemfile.
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What is the advantage of GCC's __builtin_expect in if else statements?
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188
Imagine the assembly code that would be generated from:
if (__builtin_expect(x, 0)) {
foo(...
What's the magic of “-” (a dash) in command-line parameters?
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edited Nov 8 '11 at 3:15
answered Nov 8 '11 at 3:09
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How many bytes in a JavaScript string?
...vascript string which is about 500K when being sent from the server in UTF-8. How can I tell its size in JavaScript?
13 Ans...
UnicodeEncodeError: 'ascii' codec can't encode character u'\xa0' in position 20: ordinal not in rang
...tring:
p.agent_info = u' '.join((agent_contact, agent_telno)).encode('utf-8').strip()
or work entirely in unicode.
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How do shift operators work in Java? [duplicate]
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answered Jun 6 '12 at 8:48
Kazekage GaaraKazekage Gaara
14.2k1313 gold badges5252 silver badges103103 bronze badges
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When to use -retainCount?
...that @"Foo" would have a retainCount of 1. It doesn't. It's 1152921504606846975.
You'd think that [NSString stringWithString:@"Foo"] would have a retainCount of 1. It doesn't. Again, it's 1152921504606846975.
Basically, since anything can retain an object (and therefore alter its retainCount),...
Which rows are returned when using LIMIT with OFFSET in MySQL?
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It will return 18 results starting on record #9 and finishing on record #26.
Start by reading the query from offset. First you offset by 8, which means you skip the first 8 results of the query. Then you limit by 18. Which means you conside...