Unable to update nested dictionary value in multiprocessing's manager.dict()

Question

I am trying to update a key in a nested dictionary of multiprocessing module\'s manager.dict() but not able to do so. It doesn\'t update the value and doesn\'t throw any error t

Answer 1

Looks like this issue remains per code below:

import multiprocessing, sys;

if __name__ == '__main__':

print(sys.version);

mpd = multiprocessing.Manager().dict();
mpd['prcss'] = {'q' : 'queue_1', 'ctlg' : 'ctlg_1' };

# update 1 - doesn't work!
mpd['prcss'].update( { 'name': 'concfun_1'} );
print('Result of failed update 1:', mpd['prcss']);

# update 2 - doesn't work!
mpd['prcss']['name'] = 'concfun_1';
print('Result of failed update 2:', mpd['prcss']);

# update 3 - works!
mpd_prcss = mpd['prcss'];
mpd_prcss['name'] = 'concfun_1';
mpd['prcss'] = mpd_prcss;
print('Result of successful update 3:', mpd['prcss']);

---

Output:

3.6.1 (v3.6.1:69c0db5, Mar 21 2017, 17:54:52) [MSC v.1900 32 bit (Intel)]

Result of failed update 1: {'q': 'queue_1', 'ctlg': 'ctlg_1'}

Result of failed update 2: {'q': 'queue_1', 'ctlg': 'ctlg_1'}

Result of successful update 3: {'q': 'queue_1', 'ctlg': 'ctlg_1', 'name': 'concfun_1'}