circuitpython/tests/float/string_format_modulo.py

print("%s" % 1.0)
print("%r" % 1.0)

print("%d" % 1.0)
print("%i" % 1.0)
print("%u" % 1.0)

# these 3 have different behaviour in Python 3.x versions
# uPy raises a TypeError, following Python 3.5 (earlier versions don't)
#print("%x" % 18.0)
#print("%o" % 18.0)
#print("%X" % 18.0)

print("%e" % 1.23456)
print("%E" % 1.23456)
print("%f" % 1.23456)
print("%F" % 1.23456)
print("%g" % 1.23456)
print("%G" % 1.23456)

print("%06e" % float("inf"))
print("%06e" % float("-inf"))
print("%06e" % float("nan"))

print("%02.3d" % 123) # prec > width
print("%+f %+f" % (1.23, -1.23)) # float sign
print("% f % f" % (1.23, -1.23)) # float space sign
print("%0f" % -1.23) # negative number with 0 padding

# numbers with large negative exponents
print('%f' % 1e-10)
print('%f' % 1e-20)
print('%f' % 1e-50)
print('%f' % 1e-100)
print('%f' % 1e-300)

# large decimal precision should be truncated and not overflow buffer
# the output depends on the FP calculation so only first 2 digits are printed
# (the 'g' with small e are printed using 'f' style, so need to be checked)
print(('%.40f' % 1e-300)[:2])
print(('%.40g' % 1e-1)[:2])
print(('%.40g' % 1e-2)[:2])
print(('%.40g' % 1e-3)[:2])
print(('%.40g' % 1e-4)[:2])

print("%.0g" % 1) # 0 precision 'g'

print('%.1e' % 9.99) # round up with positive exponent
print('%.1e' % 0.999) # round up with negative exponent