mkdir与子文件夹在终端中工作，但不是从python

我想用子文件夹创建一些文件夹，并使用这个python3脚本读取csv文件并为我创建目录。

from subprocess import call
import csv

def csv_dict_reader(file_obj):
    """
    Read a CSV file using csv.DictReader
    """
    reader = csv.DictReader(file_obj, delimiter=',')
    for line in reader:
        sanitized_name = line["course"].replace(" ", "-").lower()

        command = 'mkdir -p ' + sanitized_name + '/week_{1..'+ line["week"] +'}/{slides,exercise,assignment}'
        call(command)


if __name__ == "__main__":
    with open("courses.csv") as f_obj:
        csv_dict_reader(f_obj)

我期待它执行这种命令

mkdir -p algorithmic-toolbox/week_{1..6}/{slides,exercise,assignment}

在终端上可以正常工作，并创建一个文件夹，其中包含algorithmic-toolbox6个文件夹week1 to week6，然后每个文件夹都包含slides, exercises and assignment文件夹。

一个示例csv将是这样的：

course,week
Algorithmic Toolbox,6
Data Structures,4
Algorithms on Graphs,5

运行python脚本时出现此错误。

Traceback (most recent call last):
  File "course-folder.py", line 18, in <module>
    csv_dict_reader(f_obj)
  File "course-folder.py", line 13, in csv_dict_reader
    call(command)
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/subprocess.py", line 267, in call
with Popen(*popenargs, **kwargs) as p:
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/subprocess.py", line 709, in __init__
restore_signals, start_new_session)
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/subprocess.py", line 1344, in _execute_child
raise child_exception_type(errno_num, err_msg, err_filename)
FileNotFoundError: [Errno 2] No such file or directory: 'mkdir -p algorithmic-toolbox/week_{1..6}/{slides,exercise,assignment}': 'mkdir -p algorithmic-toolbox/week_{1..6}/{slides,exercise,assignment}'

不知道FilenotFoundError在创建目录时为什么会这样说，-p如果目录不存在，应该使用该目录创建父目录。