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How to automatically generate a stacktrace when my program crashes
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521
For Linux and I believe Mac OS X, if you're using gcc, or any compiler that uses glibc, you can ...
Add column with number of days between dates in DataFrame pandas
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df['A'] = pd.to_datetime(df['A'])
df['B'] = pd.to_datetime(df['B'])
In [11]: df.dtypes # if already datetime64 you don't need to use to_datetime
Out[11]:
A datetime64[ns]
B datetime64[ns]
dtype: object
In [12]: df['A'] - df['B']
Out[12]:
one -58 days
two -26 days
dtype: timedelta64[ns...
How to swap keys and values in a hash
...was inverted (in essence, by letting you access keys through values):
{a: 1, b: 2, c: 3}.key(1)
=> :a
If you want to keep the inverted hash, then Hash#invert should work for most situations:
{a: 1, b: 2, c: 3}.invert
=> {1=>:a, 2=>:b, 3=>:c}
BUT...
If you have duplicate values,...
Iterate through the fields of a struct in Go
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126
After you've retrieved the reflect.Value of the field by using Field(i) you can get a
interfac...
Ruby on Rails: How do you add add zeros in front of a number if it's under 10?
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142
Did you mean sprintf '%02d', n?
irb(main):003:0> sprintf '%02d', 1
=> "01"
irb(main):00...
Creating a JavaScript cookie on a domain and reading it across sub domains
Below is a JavaScript cookie that is written on the user's computer for 12 months.
4 Answers
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How to get a list of properties with a given attribute?
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answered Feb 17 '10 at 16:09
Marc Gravell♦Marc Gravell
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Get all column names of a DataTable into string array using (LINQ/Predicate)
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edited Sep 19 '15 at 8:48
answered Feb 17 '11 at 7:54
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