大约有 35,487 项符合查询结果（耗时：0.0560秒） [XML]
Stripping everything but alphanumeric chars from a string in Python
... string" \
"''.join(ch for ch in string.printable if ch.isalnum())"
10000 loops, best of 3: 57.6 usec per loop
$ python -m timeit -s \
"import string" \
"filter(str.isalnum, string.printable)"
10000 loops, best of 3: 37.9 usec per loop
$ python -m timeit -s \
"im...
How do you run a SQL Server query from PowerShell?
... TylerH
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answered Sep 21 '13 at 17:35
Chris MagnusonChris Magnuson
4,...
Get name of object or class
...
370
Get your object's constructor function and then inspect its name property.
myObj.constructor.na...
Is it possible to use JS to open an HTML select to show its option list? [duplicate]
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edited Jul 10 '18 at 10:31
answered Jan 10 '09 at 0:20
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ArrayList initialization equivalent to array initialization [duplicate]
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answered May 3 '10 at 20:33
meritonmeriton
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Purpose of Unions in C and C++
...behavior is described as producing implementation-defined behavior in C89/90.
EDIT: Using unions for the purposes of type punning (i.e. writing one member and then reading another) was given a more detailed definition in one of the Technical Corrigenda to the C99 standard (see DR#257 and DR#283). H...
How do I use Wget to download all images into a single folder, from a URL?
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edited Mar 4 '18 at 0:13
Monica Heddneck
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a...
Comparing two dataframes and getting the differences
...pby(list(df.columns))
get index of unique records
>>> idx = [x[0] for x in df_gpby.groups.values() if len(x) == 1]
filter
>>> df.reindex(idx)
Date Fruit Num Color
9 2013-11-25 Orange 8.6 Orange
8 2013-11-25 Apple 22.1 Red
...
SQL Server loop - how do I loop through a set of records
...ld YourFieldDataType;
BEGIN
SET @MyCursor = CURSOR FOR
select top 1000 YourField from dbo.table
where StatusID = 7
OPEN @MyCursor
FETCH NEXT FROM @MyCursor
INTO @MyField
WHILE @@FETCH_STATUS = 0
BEGIN
/*
YOUR ALGORITHM GOES HERE
*...
How to strip all whitespace from string
...initial timings:
$ python -m timeit '"".join(" \t foo \n bar ".split())'
1000000 loops, best of 3: 1.38 usec per loop
$ python -m timeit -s 'import re' 're.sub(r"\s+", "", " \t foo \n bar ")'
100000 loops, best of 3: 15.6 usec per loop
Note the regex is cached, so it's not as slow as you'd imagin...