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How do I escape reserved words used as column names? MySQL/Create Table
...a class may have a field name key which is a reserved MySQL keyword. How do I escape it in a create table statement? (Note: The other problem below is text must be a fixed size to be indexed/unique)
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How do I pipe a subprocess call to a text file?
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If you want to write the output to a file you can use the stdout-argument of subprocess.call.
It takes None, subprocess.PIPE, a file object or a file descriptor. The first is the default, stdout is inherited from the parent (your script). The second allows you to pipe from one comman...
How can I make a weak protocol reference in 'pure' Swift (without @objc)
weak references don't seem to work in Swift unless a protocol is declared as @objc , which I don't want in a pure Swift app.
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Why do I need 'b' to encode a string with Base64?
...haracters A-Z, a-z, 0-9, +, /* so it can be transmitted over channels that do not preserve all 8-bits of data, such as email.
Hence, it wants a string of 8-bit bytes. You create those in Python 3 with the b'' syntax.
If you remove the b, it becomes a string. A string is a sequence of Unicode chara...
Replace transparency in PNG images with white background
...nvert" operations, but either nothing happens at all or I get an error. I don't want to go to an intermediate JPG form because I don't want the artifacts. Of course it's easy to do this in Gimp or Photoshop or whatever, but I'd really rather script it from the command line because there are many ...
Access an arbitrary element in a dictionary in Python
... cryptic and I'd rather prefer your code.
If you want to remove any item, do:
key, value = mydict.popitem()
Note that "first" may not be an appropriate term here because dict is not an ordered type in Python < 3.6. Python 3.6+ dicts are ordered.
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An algorithm for inflating/deflating (offsetting, buffering) polygons
How would I "inflate" a polygon? That is, I want to do something similar to this:
12 Answers
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Why is reading lines from stdin much slower in C++ than Python?
...y C++ is rusty and I'm not yet an expert Pythonista, please tell me if I'm doing something wrong or if I'm misunderstanding something.
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Git: Recover deleted (remote) branch
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I tried fsck earlier; do you know how to find out which commit is the correct one? I've got 20 to try.
– Craig Walker
Jan 2 '10 at 19:08
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How do I “undo” a --single-branch clone?
...may have changed if you're running an older version of Git. If my commands don't work, then I'd recommend looking through .git/config to see if you can see something similar.
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