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Creating Multifield Indexes in Mongoose / MongoDB
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194
You call the index method on your Schema object to do that as shown here. For your case it wo...
Numpy index slice without losing dimension information
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It's probably easiest to do x[None, 10, :] or equivalently (but more readable) x[np.newaxis, 10, :].
As far as why it's not the default, personally, I find that constantly having arrays with singleton dimensions gets annoying very quickly. I'd guess the nump...
Pandas dataframe get first row of each group
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>>> df.groupby('id').first()
value
id
1 first
2 first
3 first
4 second
5 first
6 first
7 fourth
If you need id as column:
>>> df.groupby('id').first().reset_index()
id value
0 1 first
1 2 first
2 3 first
3 4 seco...
Getting list of lists into pandas DataFrame
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271
Call the pd.DataFrame constructor directly:
df = pd.DataFrame(table, columns=headers)
df
He...
How do you pass arguments to define_method?
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198
The block that you pass to define_method can include some parameters. That's how your defined...
finding and replacing elements in a list
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16 Answers
16
Active
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how to mysqldump remote db from local machine
...t at serverfault yet, and the answer is quite simple:
Change:
ssh -f -L3310:remote.server:3306 user@remote.server -N
To:
ssh -f -L3310:localhost:3306 user@remote.server -N
And change:
mysqldump -P 3310 -h localhost -u mysql_user -p database_name table_name
To:
mysqldump -P 3310 -h 127.0....
How to randomize (or permute) a dataframe rowwise and columnwise?
I have a dataframe (df1) like this.
8 Answers
8
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How to switch position of two items in a Python list?
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i = ['title', 'email', 'password2', 'password1', 'first_name',
'last_name', 'next', 'newsletter']
a, b = i.index('password2'), i.index('password1')
i[b], i[a] = i[a], i[b]
share
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MySQL's now() +1 day
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461
You can use:
NOW() + INTERVAL 1 DAY
If you are only interested in the date, not the date and ...