用python文件实现自动下载链接中的资源

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import os

from subprocess import call

print("")

print("Downloading...")
if not os.path.exists("UCI HAR Dataset.zip"):
    call(
        'wget "https://archive.ics.uci.edu/ml/machine-learning-databases/00240/UCI HAR Dataset.zip"',
        shell=True
    )
    print("Downloading done.\n")
else:
    print("Dataset already downloaded. Did not download twice.\n")

print("Extracting...")
extract_directory = os.path.abspath("UCI HAR Dataset")
if not os.path.exists(extract_directory):
    call(
        'unzip -nq "UCI HAR Dataset.zip"',
        shell=True
    )
    print("Extracting successfully done to {}.".format(extract_directory))
else:
    print("Dataset already extracted. Did not extract twice.\n")