from random import random
with open("sample-lat-lon.csv", "w") as f:
    f.write("lat,lon\n")

    # Edge cases
    # Do both positive and negative
    for neg in ("-", ""):
        # Add a little bit of variation
        for dec in ("0", "00000001", "5", "05", "9999"):
            # Possibly strange latitudes
            for lat_i in (0, 1, 90):
                # Possibly strong longitudes
                for lon_i in (0, 1, 90, 180):
                    f.write(f"{neg}{lat_i}.{dec},")
                    f.write(f"{neg}{lon_i}.{dec}\n")

    # Normalized
    for i in range(10000):
        lat = (random() - .5) * 2 * 90
        lon = (random() - .5) * 2 * 180
        f.write(f"{lat},{lon}\n")

    # Non-normalized
    for i in range(10000):
        lat = (random() - .5) * 2 * 1000
        lon = (random() - .5) * 2 * 1000
        f.write(f"{lat},{lon}\n")