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Efficient way to apply multiple filters to pandas DataFrame or Series
...numpy) allow for boolean indexing, which will be much more efficient:
In [11]: df.loc[df['col1'] >= 1, 'col1']
Out[11]:
1 1
2 2
Name: col1
In [12]: df[df['col1'] >= 1]
Out[12]:
col1 col2
1 1 11
2 2 12
In [13]: df[(df['col1'] >= 1) & (df['col1'] <=1 )]
Out...
What is the difference between a symbolic link and a hard link?
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deceleratedcaviar
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answered Oct 7 '09 at 13:54
Adam MatanAdam Matan
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What is “Argument-Dependent Lookup” (aka ADL, or “Koenig Lookup”)?
...cribes how unqualified names are looked up by the compiler in C++.
The C++11 standard § 3.4.2/1 states:
When the postfix-expression in a function call (5.2.2) is an unqualified-id, other namespaces not considered during the usual unqualified lookup (3.4.1) may be searched, and in those namespa...
Why do Twitter Bootstrap tables always have 100% width?
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edited Feb 11 '15 at 13:42
Iulian Onofrei
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Can I create a One-Time-Use Function in a Script or Stored Procedure?
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answered Jun 11 '09 at 14:32
Joel CoehoornJoel Coehoorn
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Python, Unicode, and the Windows console
...s.getwriter(locale.getpreferredencoding())(sys.stdout); \
line = u"\u0411\n"; print type(line), len(line); \
sys.stdout.write(line); print line'
UTF-8
<type 'unicode'> 2
Б
Б
$ python -c 'import sys, codecs, locale; print sys.stdout.encoding; \
sys.stdout = codecs.getwr...
__FILE__, __LINE__, and __FUNCTION__ usage in C++
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__FUNCTION__ is non standard, __func__ exists in C99 / C++11. The others (__LINE__ and __FILE__) are just fine.
It will always report the right file and line (and function if you choose to use __FUNCTION__/__func__). Optimization is a non-factor since it is a compile time macro exp...
What do (lambda) function closures capture?
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Community♦
111 silver badge
answered Feb 19 '10 at 9:58
Max ShawabkehMax Shawabkeh
33.8k8...
Finding duplicate values in a SQL table
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edited Jun 1 '18 at 11:59
Andriy M
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ans...
string c_str() vs. data()
...useful when the elements of your string are character based.
Extra: In C++11 onwards, both functions are required to be the same. i.e. data is now required to be null-terminated. According to cppreference: "The returned array is null-terminated, that is, data() and c_str() perform the same functio...