alexer

import Xlib.display
from Xlib import X, Xcursorfont

def XSelectWindow(dpy):
        screen = dpy.screen()
        root = screen.root
        gc = root.create_gc(background=screen.black_pixel, foreground=screen.white_pixel, function=X.GXinvert, subwindow_mode=X.IncludeInferiors)
        font = dpy.open_font('cursor')
        cursor = font.create_glyph_cursor(font, Xcursorfont.crosshair, Xcursorfont.crosshair+1, (65535, 65535, 65535), (0, 0, 0))
        try:

alexer

# Really useful in some situations, but you can see how often it's actually been used, since cmp() doesn't even exist anymore...
sign = lambda v: cmp(v, 0)

clamp = lambda v, minv, maxv: min(max(v, minv), maxv)
# These are a bit of a misnomers, since below/above suggests lt/gt, while these are le/ge
clamp_below = lambda v, maxv: min(v, maxv)
clamp_above = lambda v, minv: max(v, minv)

div_ceil = lambda dividend, divisor: (dividend - 1) // divisor + 1
# Just for symmetry

alexer

import numpy as np

def rtlsdr2numpy(datafilename, tempfilename):
        real = np.memmap(datafilename, mode='r', dtype='uint8')
        temp = np.memmap(tempfilename, mode='w+', dtype='float64', shape=real.shape)
        temp[:] = real
        temp /= 127.5
        temp -= 1
        return temp.view('complex128')

alexer

def float2str(val):
        val, sci, exp = str(val).partition('e')
        if not sci:
                return val
        sign = ''
        if val[0] in '-':
                sign = '-'
                val = val[1:]
        assert val.count('.') == 1 and val[1] == '.' and val[0] != '0'