SyntaxError: invalid syntax (line 53) - After OS Update from Ubuntu 18.04 to Ubuntu 20.04

[picoroma]

File "/usr/lib/nagios/plugins/check_cloudwatch_metric.py", line 53
return self.get_client().Metric(f'{self.prefix}/{self.namespace}', self.name)
^
SyntaxError: invalid syntax

[elias5000]

that's very little information. can you please give some context? like python version and command line parameters?
can you please try the latest version of the script? the line in your error message is in line 55 in the current version.

[picoroma]

I solved.
Applied these 2 steps.

1. Using python3 (instead of python 2 - inthe the script)
2. Installing boto3 (for python3)