路径

print(__file__)
print(os.path.realpath(__file__))
print(os.path.dirname(os.path.realpath(__file__)))#########################
C:/Users/xxx/PycharmProjects/learn/a.py
C:\Users\xxx\PycharmProjects\learn\a.py
C:\Users\xxx\PycharmProjects\learn

DEFAULT_ADB_PATH = {
    "Windows": os.path.join(STATICPATH, "adb", "windows", "adb.exe"),
    "Darwin": os.path.join(STATICPATH, "adb", "mac", "adb"),
    "Linux": os.path.join(STATICPATH, "adb", "linux", "adb"),
    "Linux-x86_64": os.path.join(STATICPATH, "adb", "linux", "adb"),
    "Linux-armv7l": os.path.join(STATICPATH, "adb", "linux_arm", "adb"),
}
#DEFAULT_ADB_PATH dict,

system = platform.system()  # Windows
machine = platform.machine() # x86_64
adb_path = DEFAULT_ADB_PATH.get('{}-{}'.format(system, machine))  # None 和 有值
DEFAULT_ADB_PATH.get(system)