Python3 命令行参数解析

# -*-coding-*-: utf-8
import sys
a=sys.argv[0]  # sys.argv[0]永远表示的是你运行的程序文件名
b=sys.argv[1]
c=sys.argv[2]
print("filename:",a)
print("param1:",b)
print("param2:",c)

ArgumentParser.add_argument(name or flags...[, action][, nargs][, const][, default][, type][, choices][, required][, help][, metavar][, dest])

import argparse
if __name__ == "__main__":
    parser = argparse.ArgumentParser(description="annotated data set for aligned")
    parser.add_argument('-r1', '--src-data-root', dest='data_root1', default='/mnt/dms_data/Data_All/custom_alarm_smokeall_20190505/json/v20190610', type=str, metavar='STRING', help='src data path')
    parser.add_argument('-r2', '--dst-data-root', dest='data_root2', default='/mnt/dms_data/Data_All/custom_alarm_smokeall_20190505/json/v20190505', type=str, metavar='STRING', help='tag data path')
    args = parser.parse_args()
    data_root1 = args.data_root1
    data_root2 = args.data_root2
    print('data_root1 path is %s' % data_root1)  # data_root1 path is /mnt/dms_data/Data_All/custom_alarm_smokeall_20190505/json/v20190610

# Description   : This will scan the current directory and all subdirectories and display the size.

import os
import sys  # Load the library module and the sys module for the argument vector'''
import argparse

# try:
#     directory = sys.argv[1]  # Set the variable directory to be the argument supplied by user.
# except IndexError:
#     sys.exit("Must provide an argument.")

class directory
def get_folder_size(folder_path):
    dir_size = 0  # Set the size to 0
    fsizedicr = {'Bytes': 1,
                'Kilobytes': float(1) / 1024,
                'Megabytes': float(1) / (1024 * 1024),
                'Gigabytes': float(1) / (1024 * 1024 * 1024)}
    # Walk through all the directories. For each iteration, os.walk returns the folders, subfolders and files in the dir.
    for (path, dirs, files) in os.walk(folder_path):  
        for file in files:  # Get all the files
            filename = os.path.join(path, file)
            dir_size += os.path.getsize(filename)  # Add the size of each file in the root dir to get the total size.

    fsizeList = [str(round(fsizedicr[key] * dir_size, 2)) + " " + key for key in fsizedicr]  # List of units

    if dir_size == 0:
        print("File Empty")  # Sanity check to eliminate corner-case of empty file.
    else:
        for units in sorted(fsizeList)[::-1]:  # Reverse sort list of units so smallest magnitude units print first.
            print("Folder Size: " + units)

if __name__ == "__main__":
    parser = argparse.ArgumentParser(description='This will scan the current directory and all subdirectories and display the size.')
    parser.add_argument('--folder_path', type=str, default="C:\\Users\\zhanghonggao\\Documents\\image_utils",
                        help='the path of folder,')
    args = parser.parse_args()
    get_folder_size(args.folder_path)

python folder_size.py --folder_path "C:\Users\zhanghonggao\Documents\image_utils"。