Kaixing Si's Blog

Replace a value in a list

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index = items.index(old_value)
items[index] = new_value

PyQt4 does not ship with helper methods for enumerating every item in QListWidget or QTreeWidget. Here are two straightforward patterns I found online:

I rely on URL schemes frequently, yet could not find a tidy list for Chinese apps. This collection pulls together what I found online. Let me know if anything needs updating.

A few notes I took while reading the Google Python Style Guide.

My aging laptop started crashing after running a game for a while. The screen went blue, showed “system thread exception not handled,” and rebooted endlessly. After trying the usual fixes and preparing for a reinstall, I stumbled across this thread: http://answers.microsoft.com/zh-hans/windows/forum/windows_10-performance/win10/2c730d1a-9e1d-4da1-a11b-5659df6169ec?auth=1

A running list of macOS apps I always install. Everyday tools like WeChat are omitted. Order does not imply preference.

A running list of Windows applications I always install. Everyday tools like WeChat are omitted. Order does not imply preference.

I needed a QLineEdit that selects all text when you click it. Since the widget has no built-in click signal, we have to handle it ourselves.

File extensions

You probably know about .py and .pyc, but Python uses a few other extensions as well.

Keys

Plaintext is the original message; ciphertext is the encrypted result.