def non_exp_repr(x):
"""Return a floating point representation without exponential notation.
Result is a string that satisfies:
float(result)==float(x) and 'e' not in result.
>>> non_exp_repr(1.234e-025)
'0.00000000000000000000000012339999999999999'
>>> non_exp_repr(-1.234e+018)
'-1234000000000000000.0'
>>> for e in xrange(-50,51):
... for m in (1.234, 0.018, -0.89, -75.59, 100/7.0, -909):
... x = m * 10 ** e
... s = non_exp_repr(x)
... assert 'e' not in s
... assert float(x) == float(s)
"""
s = repr(float(x))
e_loc = s.lower().find('e')
if e_loc == -1:
return s
mantissa = s[:e_loc].replace('.', '')
exp = int(s[e_loc+1:])
assert s[1] == '.' or s[0] == '-' and s[2] == '.', "Unsupported format"
sign = ''
if mantissa[0] == '-':
sign = '-'
mantissa = mantissa[1:]
digitsafter = len(mantissa) - 1 # num digits after the decimal point
if exp >= digitsafter:
return sign + mantissa + '0' * (exp - digitsafter) + '.0'
elif exp <= -1:
return sign + '0.' + '0' * (-exp - 1) + mantissa
ip = exp + 1 # insertion point
return sign + mantissa[:ip] + '.' + mantissa[ip:]
if __name__ == '__main__':
import doctest
print 'Doctest results:', doctest.testmod()
