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How can I check the syntax of Python script without executing it?
...and then exit without executing it. Is there an equivalent way to do this for a Python script?
8 Answers
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Sound alarm when code finishes
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On Windows
import winsound
duration = 1000 # milliseconds
freq = 440 # Hz
winsound.Beep(freq, duration)
Where freq is the frequency in Hz and the duration is in milliseconds.
On Linux and Mac
import os
duration = 1 # seconds
freq = ...
Python integer incrementing with ++ [duplicate]
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Python doesn't support ++, but you can do:
number += 1
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The modulo operation on negative numbers in Python
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Unlike C or C++, Python's modulo operator (%) always return a number having the same sign as the denominator (divisor). Your expression yields 3 because
(-5) / 4 = -1.25 --> floor(-1.25) = -2
(-5) % 4 = (-2 × 4 + 3) % 4 = 3.
It...
How to read lines of a file in Ruby
...endings since both "\r\n" and "\r" are converted to Linux standard "\n" before parsing the lines.
To support the "\r" EOL character along with the regular "\n", and "\r\n" from Windows, here's what I would do:
line_num=0
text=File.open('xxx.txt').read
text.gsub!(/\r\n?/, "\n")
text.each_line do |l...
How to watch for array changes?
...here a way to be notified when an array is modified using push, pop, shift or index-based assignment? I want something that would fire an event that I could handle.
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Using HTML and Local Images Within UIWebView
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Using relative paths or file: paths to refer to images does not work with UIWebView. Instead you have to load the HTML into the view with the correct baseURL:
NSString *path = [[NSBundle mainBundle] bundlePath];
NSURL *baseURL = [NSURL fileURLWi...
Read only the first line of a file?
...ically closes the file again when the block ends.
The with statement only works in Python 2.5 and up, and in Python 2.5 you need to use from __future__ import with_statement
In Python 3 you should specify the file encoding for the file you open. Read more...
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Intelli J IDEA takes forever to update indices
Is it normal for Intelli J to take a lot of time (almost 12 hours) to update indices for a project? I just installed Intelli J on my machine and imported a rather large Maven project (13k+ files).
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How to loop through all enum values in C#? [duplicate]
...GetValues method:
var values = Enum.GetValues(typeof(Foos));
Or the typed version:
var values = Enum.GetValues(typeof(Foos)).Cast<Foos>();
I long ago added a helper function to my private library for just such an occasion:
public static class EnumUtil {
public static IEnume...