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Combine two columns of text in pandas dataframe
...f["period"] = df["Year"].astype(str) + df["quarter"]
Beware of NaNs when doing this!
If you need to join multiple string columns, you can use agg:
df['period'] = df[['Year', 'quarter', ...]].agg('-'.join, axis=1)
Where "-" is the separator.
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receiver type *** for instance message is a forward declaration
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If you're trying to use Swift objects in Objective-C, don't forget they have to inherit from NSObject.
– Michal Šrůtek
Feb 20 at 14:16
add a comment
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Simulate limited bandwidth from within Chrome?
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I'd recommend Charles Proxy - you can choose to slowdown individual sites, also has a whole bunch of HTTP inspection tools.
Edit:
As of June 2014, Chrome now has the ability to do this natively in DevTools - you'll need Chrome 38 though.
The option is accessible from the Ne...
Postgres DB Size Command
... @philpirozhkov Connect to a database first (\c dbname), then do \d+.
– chappjc
Jan 15 '19 at 15:53
Is th...
Flask-SQLalchemy update a row's information
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Retrieve an object using the tutorial shown in the Flask-SQLAlchemy documentation. Once you have the entity that you want to change, change the entity itself. Then, db.session.commit().
For example:
admin = User.query.filter_by(username='admin').first()
admin.email = 'my_new_email@example.c...
What does static_assert do, and what would you use it for?
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This answer doesn't provide any details on what's the difference between assert from <cassert> and static_assert
– bitek
Jan 16 '13 at 15:23
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Using “like” wildcard in prepared statement
... value itself, not in the prepared statement SQL string.
So, this should do for a prefix-match:
notes = notes
.replace("!", "!!")
.replace("%", "!%")
.replace("_", "!_")
.replace("[", "![");
PreparedStatement pstmt = con.prepareStatement(
"SELECT * FROM analysis WHERE note...
Create an index on a huge MySQL production table without table locking
...ate: MySQL 5.6 has support for online index updates
https://dev.mysql.com/doc/refman/8.0/en/innodb-online-ddl-operations.html#online-ddl-index-syntax-notes
In MySQL 5.6 and higher, the table remains available for read and write operations while the index is being created or dropped. The CREATE ...
Copying files into the application folder at compile time
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You could do this with a post build event. Set the files to no action on compile, then in the macro copy the files to the directory you want.
Here's a post build Macro that I think will work by copying all files in a directory called ...
How to make a phone call programmatically?
...t);
An intent by itself is simply an object that describes something. It doesn't do anything.
Don't forget to add the relevant permission to your manifest:
<uses-permission android:name="android.permission.CALL_PHONE" />
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