使用Python代碼實(shí)現(xiàn)Linux中的ls遍歷目錄命令的實(shí)例代碼

# test.py
import argparse
parser = argparse.ArgumentParser(description='Find the maximum number.')
parser.add_argument("integers", type=int, nargs="+", help="The input integers.")
parser.add_argument("-min", nargs="?", required=False, dest="find_num", default=max, const=min, 
      help="Find the minimum number(Default: find the maximum number).")
 
args = parser.parse_args()
print(args)
print(args.find_num(args.Nums))

 def main():
  """
  主函數(shù)，設(shè)置和接收命令行參數(shù)，并根據(jù)參數(shù)調(diào)用相應(yīng)方法
  :return:
  """
  # 創(chuàng)建解析器
  parse = argparse.ArgumentParser(description="Python_ls")
  # 可選參數(shù)
  parse.add_argument("-a", "-all", help="Show all files", action="store_true", required=False)
  parse.add_argument("-l", "-long", help="View in long format", action="store_true", required=False)
  parse.add_argument("-k", help="Expressed in bytes", action="store_true", required=False)
  parse.add_argument("-r", "-reverse", help="In reverse order", action="store_true", required=False)
  parse.add_argument("-t", help="Sort by modified time", action="store_true", required=False)
  parse.add_argument("-V", "-Version", help="Get the version", action="store_true", required=False)
  # 位置參數(shù)
  parse.add_argument("path", type=str, help="The path", nargs="?")
 
  # 命令行參數(shù)信息
  data = vars(parse.parse_args())
  assert type(data) == dict
  if data["V"]:
   print("Python_ls version: 1.0")
   return
  else:
   check_arg(data)

def get_all(path):
  """
  獲取指定路徑下的全部內(nèi)容
  :param path: 路徑
  :return:
  """
  if os.path.isdir(path):
   files = [".", ".."] + os.listdir(path)
   return files
  else:
   print("No such file or directory")
   exit()

"""
Version: Python3.7
Author: OniOn
Site: http://www.cnblogs.com/TM0831/
Time: 2019/9/6 21:41
"""
import os
import time
import argparse
import terminaltables


def get(path):
 """
 獲取指定路徑下的內(nèi)容
 :param path: 路徑
 :return:
 """
 if os.path.isdir(path): # 判斷是否是真實(shí)路徑
  files = os.listdir(path)
  return files
 else:
  print("No such file or directory")
  exit()


def get_all(path):
 """
 獲取指定路徑下的全部內(nèi)容
 :param path: 路徑
 :return:
 """
 if os.path.isdir(path):
  files = [".", ".."] + os.listdir(path)
  return files
 else:
  print("No such file or directory")
  exit()


def check_arg(data):
 """
 檢查參數(shù)信息
 :param data: 命令行參數(shù)（dict）
 :return:
 """
 assert type(data) == dict
 if not data["path"]:
  data["path"] = "."
 # a參數(shù)
 if data["a"]:
  files = get_all(data["path"])
 else:
  files = get(data["path"])
 # r參數(shù)
 if data["r"]:
  files = files[::-1]
 # t參數(shù)
 if data["t"]:
  files = sorted(files, key=lambda x: os.stat(x).st_mtime)
  for i in range(len(files)):
   files[i] = [files[i], time.strftime("%Y-%m-%d %H:%M:%S", time.localtime(os.stat(files[i]).st_mtime))]
 # l參數(shù)
 if data["l"]:
  result = []
  for i in range(len(files)):
   file = files[i][0] if data["t"] else files[i]
   # 獲取文件信息
   file_info = os.stat(file)
   # k參數(shù)
   if data["k"]:
    # 格式化時間，文件大小用KB表示
    result.append([file, time.strftime("%Y-%m-%d %H:%M:%S", time.localtime(file_info.st_ctime)),
        "%.3f KB" % (file_info.st_size / 1024)])
   else:
    # 格式化時間，文件大小用B表示
    result.append([file, time.strftime("%Y-%m-%d %H:%M:%S", time.localtime(file_info.st_ctime)),
        "{} Byte".format(file_info.st_size)])
  if data["t"]:
   for i in result:
    i.append(time.strftime("%Y-%m-%d %H:%M:%S", time.localtime(os.stat(i[0]).st_mtime)))

  show_file(result, True, True) if data["t"] else show_file(result, True, False)
  return
 show_file(files, False, True) if data["t"] else show_file(files, False, False)


def show_file(files, has_l, has_t):
 """
 格式化輸出文件信息
 :param files: 文件列表
 :param has_l: 是否有l(wèi)參數(shù)
 :param has_t: 是否有t參數(shù)
 :return:
 """
 # 根據(jù)參數(shù)信息設(shè)置表頭
 if not has_l:
  if not has_t:
   table_data = [["ID", "FILE_NAME"]]
   for i in range(len(files)):
    table_data.append([i + 1, files[i]])
  else:
   table_data = [["ID", "FILE_NAME", "FILE_MTIME"]]
   for i in range(len(files)):
    table_data.append([i + 1] + files[i])
 else:
  if not has_t:
   table_data = [["ID", "FILE_NAME", "FILE_CTIME", "FILE_SIZE"]]
  else:
   table_data = [["ID", "FILE_NAME", "FILE_CTIME", "FILE_SIZE", "FILE_MTIME"]]
  for i in range(len(files)):
   table_data.append([i + 1] + files[i])

 # 創(chuàng)建AsciiTable對象
 table = terminaltables.AsciiTable(table_data)
 # 設(shè)置標(biāo)題
 table.title = "file table"
 for i in range(len(table.column_widths)):
  if i != 1:
   # 居中顯示
   table.justify_columns[i] = "center"
 print(table.table)


def main():
 """
 主函數(shù)，設(shè)置和接收命令行參數(shù)，并根據(jù)參數(shù)調(diào)用相應(yīng)方法
 :return:
 """
 # 創(chuàng)建解析器
 parse = argparse.ArgumentParser(description="Python_ls")
 # 可選參數(shù)
 parse.add_argument("-a", "-all", help="Show all files", action="store_true", required=False)
 parse.add_argument("-l", "-long", help="View in long format", action="store_true", required=False)
 parse.add_argument("-k", help="Expressed in bytes", action="store_true", required=False)
 parse.add_argument("-r", "-reverse", help="In reverse order", action="store_true", required=False)
 parse.add_argument("-t", help="Sort by modified time", action="store_true", required=False)
 parse.add_argument("-V", "-Version", help="Get the version", action="store_true", required=False)
 # 位置參數(shù)
 parse.add_argument("path", type=str, help="The path", nargs="?")

 # 命令行參數(shù)信息
 data = vars(parse.parse_args())
 assert type(data) == dict
 if data["V"]:
  print("Python_ls version: 1.0")
  return
 else:
  check_arg(data)


if __name__ == '__main__':
 main()