This library is specific to Linux, if you use this library in Windows system development, it will generate some errors, how to solve it?
Create a new fcntl.py file

DN_ACCESS = 1
DN_ATTRIB = 32
DN_CREATE = 4
DN_DELETE = 8
DN_MODIFY = 2
DN_MULTISHOT = 2147483648
DN_RENAME = 16

FASYNC = 8192

FD_CLOEXEC = 1

F_ADD_SEALS = 1033

F_DUPFD = 0

F_DUPFD_CLOEXEC = 1030

F_EXLCK = 4
F_GETFD = 1
F_GETFL = 3
F_GETLEASE = 1025
F_GETLK = 5
F_GETLK64 = 5
F_GETOWN = 9
F_GETSIG = 11

F_GET_SEALS = 1034

F_NOTIFY = 1026
F_RDLCK = 0

F_SEAL_GROW = 4
F_SEAL_SEAL = 1
F_SEAL_SHRINK = 2
F_SEAL_WRITE = 8

F_SETFD = 2
F_SETFL = 4
F_SETLEASE = 1024
F_SETLK = 6
F_SETLK64 = 6
F_SETLKW = 7
F_SETLKW64 = 7
F_SETOWN = 8
F_SETSIG = 10
F_SHLCK = 8
F_UNLCK = 2
F_WRLCK = 1

LOCK_EX = 2
LOCK_MAND = 32
LOCK_NB = 4
LOCK_READ = 64
LOCK_RW = 192
LOCK_SH = 1
LOCK_UN = 8
LOCK_WRITE = 128

def fcntl(fd, op, arg=0):
    return 0


def ioctl(fd, op, arg=0, mutable_flag=True):
    if mutable_flag:
        return 0
    else:
        return ""


def flock(fd, op):
    return


def lockf(fd, operation, length=0, start=0, whence=0):
    return

Just find your Python path and put it in

C:\Users\{Username}\AppData\Local\Programs\Python\Python38\Lib\fcntl.py

Done!