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20.15. float(): Convert to float type

Converts a value to type float. The argument must be a number, or a string containing a numeric value in string form (possibly surrounded by whitespace). If the argument is not a valid number, this function will raise a ValueError exception. If no argument is given, it will return 0.0.

>>> float()
>>> float(17)
>>> float(' 3.1415  ')
>>> print float('6.0221418e23')
>>> float('142x')
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ValueError: invalid literal for float(): 142x