String formatting

Quantities support custom string formatting via the built-in __format__ implementation. By default quantities print in their current unit. Use the :si specifier to force conversion to SI units first.

from quantium import u

v = 1000 * (u.cm / u.s)

# Default format (current unit)
print(f"{v}")      # 1000 cm/s
print(f"{v:native}") # 1000 cm/s

# Force SI format
print(f"{v:si}")   # 10 m/s

The format specifiers accepted are: '' (empty), 'unit'/'u' (current unit) and 'si' (convert and display SI). Any other specifier raises ValueError.