python实现ls命令

[python]代码库

import datetime
from pathlib import Path
import argparse
import stat
def convert_mode(mode:int):
    modelist = ['r', 'w', 'x', 'r', 'w', 'x', 'r', 'w', 'x']
    modestr = bin(mode)[-9:]  #'110 110 100'
    ret = ""
    for i,c in enumerate(modestr):
        if c == '1':
            ret += modelist[i]
        else:
            ret += '-'
    return ret

# d - s p l c  b
def convert_type(file:Path):
    ret = ""
    if file.is_symlink():
        ret = "l"
    elif file.is_fifo():
        ret = "p"
    elif file.is_socket():
        ret = "s"
    else:
        ret = '-'
    return ret


parser = argparse.ArgumentParser(prog='ls',add_help=False,description='list contens directory')   #构造解析器
parser.add_argument('path',nargs='?',default='.')  #位置参数
parser.add_argument('-l',action='store_true')
parser.add_argument('-h',action='store_true')
parser.add_argument('-a','--all',action='store_true')
# drwxrwxr-x. 3 python python      4096 Jul 21  2020 magedu
def showdir(path='.',all=False, detail=False, human=False):
    p = Path(path)
    for file in p.iterdir():
        if not all and file.name.startswith('.'):  # .开头，不打印
            continue
            # -l 解决-l的问题
        if detail:
            st = file.stat()
            yield (stat.filemode(st.st_mode),st.st_nlink,st.st_uid,st.st_gid,st.st_size,datetime.datetime.fromtimestamp(st.st_atime).strftime('%Y-%m-%d %H-%M-%S'),file.name)
            #yield xxxx
        else:
            yield (file.name,)
# ls [path] [-l] [-a]



if __name__ == "__main__":
    args = parser.parse_args(("e:/","-lah"))
    print('args=',args)
    parser.print_help()
    for st in showdir(args.path,args.all,args.l,args.h):
        print(st)