Python f-strings

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Some further notes on Python f-strings:

1. Never use the f or F formats for floating point numbers. Use g instead. The problem is the f format fixes the number of digits after the decimal separator and that is most probably not what you want.

>>> f'{0.00001234:.2f}'  # Gets converted to zero
0.00
>>> f'{0.00001234:.2g}'  # Does the right thing
'1.2e-05'
>>> f'{123456:.2f}'  # We get a pretty insane precision
'123456.00'
>>> f'{123456:.2g}'  # Does the right thing
'1.2e+05'