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# Class
# Input, Output, string, int, float
{:.no_toc}
<nav markdown="1" class="toc-class">
@ -61,4 +61,32 @@ class int(x, base=10)
>
> The integer type is described in [Numeric Types — int, float, complex.](https://docs.python.org/3/library/stdtypes.html#typesnumeric)
## [float](https://docs.python.org/3/library/functions.html#float)
```python
class float(x=0.0)
```
> Return a floating point number constructed from a number or string x.
>
> If the argument is a string, it should contain a decimal number, optionally preceded by a sign, and optionally embedded in whitespace. The optional sign may be '+' or '-'; a '+' sign has no effect on the value produced. The argument may also be a string representing a NaN (not-a-number), or positive or negative infinity. More precisely, the input must conform to the floatvalue production rule in the following grammar, after leading and trailing whitespace characters are removed:
```python
sign ::= "+" | "-"
infinity ::= "Infinity" | "inf"
nan ::= "nan"
digitpart ::= `!digit` (["_"] `!digit`)*
number ::= [digitpart] "." digitpart | digitpart ["."]
exponent ::= ("e" | "E") ["+" | "-"] digitpart
floatnumber ::= number [exponent]
floatvalue ::= [sign] (floatnumber | infinity | nan)
```
> Here digit is a Unicode decimal digit (character in the Unicode general category Nd). Case is not significant, so, for example, “inf”, “Inf”, “INFINITY”, and “iNfINity” are all acceptable spellings for positive infinity.
>
> Otherwise, if the argument is an integer or a floating point number, a floating point number with the same value (within Python’s floating point precision) is returned. If the argument is outside the range of a Python float, an OverflowError will be raised.
>
> For a general Python object x, float(x) delegates to x.\_\_float\_\_(). If \_\_float\_\_() is not defined then it falls back to \_\_index\_\_().
>
> If no argument is given, 0.0 is returned.