<｜begin▁of▁sentence｜>### Instruction:
Given igraph's configuration settings, if you need to change the default plotting backend to 'matplotlib', how would you update the configuration and verify the new setting?
### Response:
from igraph import config

# Retrieve default configuration
default_config = config['default']

# Modify a configuration setting
config['plotting.backend'] = 'matplotlib'

# Print the modified configuration for plotting backend
default_plotting_backend = config['plotting.backend']
print('The default plotting backend is now:', default_plotting_backend)
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