with zipfile.ZipFile('/Users/liujianing/Downloads/a.zip') as z:
for file in z.namelist():
z.extract(file, '/Users/liujianing/Downloads')
with zipfile.ZipFile('/Users/liujianing/Downloads/a.zip') as z:
for file in z.namelist():
z.extract(file, '/Users/liujianing/Downloads')