⚠️ multiprocessing.Manager.dict 使用注意

from multiprocessing import Manager

# 1
md = Manager().dict()
md['a'] = ['a']
if 'a' in md.keys():
    a = md.get('a')
    a.append('b')
    md['a'] = a
print(md)

# 2
md = Manager().dict()
md['a'] = ['a']
if 'a' in md.keys():
    md['a'].append('b')
print(md)

#1  {'a': ['a', 'b']}
#2  {'a': ['a']}