python3 - format with {} symbols

Question

I hav egot problem with string

'replication = {\'class\' : \'NetworkTopologyStrategy\', \'datacenter1\' : {}};'.format(N)

Why does it return:

replication = \{\'class\' : \'NetworkTopologyStrategy\', \'datacenter1\': {} };'.format(N)  
KeyError: "'class' "

If you notice, you're not actually escaping your characters. — pstatix
– pstatix, Commented Apr 12, 2018 at 12:25
Literal { and } characters in a format string must be escaped: {{ }} — 0x5453
– 0x5453, Commented Apr 12, 2018 at 12:25

DeepSpace · Accepted Answer · 2018-04-12 12:34:32Z

1

Formatting a string that contains arbitrary {} can be funky.

In this case you'd need to surround the entire string in additional {} in order to escape the { and } that should be ignored by format:

N = 'xxx'
print('replication = {{\'class\' : \'NetworkTopologyStrategy\', \'datacenter1\' : {}}};'
      .format(N))

# replication = {'class' : 'NetworkTopologyStrategy', 'datacenter1' : xxx};

edited Apr 12, 2018 at 12:34

answered Apr 12, 2018 at 12:25

DeepSpace

82.1k12 gold badges119 silver badges166 bronze badges

Sign up to request clarification or add additional context in comments.

1 Comment

przemyslaw.sagalo Over a year ago

Thank you. I have solve it by 'replication = {\'class\' : \'NetworkTopologyStrategy\', \'' + data_center_name + '\' : ' + str(N) + ' }'. But your way is more pretty

Collectives™ on Stack Overflow

python3 - format with {} symbols

1 Answer 1

1 Comment

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

1 Comment

Related