The float() method returns the corresponding floating-point number from a given number or a string.
float([x]) #Where x can be a number or string that needs to convert
It takes a single parameter, a number, or string that needs to return a floating-point number
| Parameter | Description | Required / Optional |
|---|---|---|
| Float | Used as a floating number | Optional |
| Integer | Used as an integer number | Optional |
| String | It contains decimal numbers. Leading and trailing whitespaces are removed. Optional use of "+", "-" signs. Could contain NaN, Infinity, inf (lowercase or uppercase). | Optional |
| Input | Return Value |
|---|---|
| If an argument | Equivalent floating-point number |
| If no argument | 0.0 |
| The argument is outside the range of Python float | OverflowError exception |
# for integers
print(float(20))
# for floats
print(float(12.33))
# for string floats
print(float("-15.34"))
# for string floats with whitespaces
print(float(" -32.25\n"))
# string float error
print(float("abcd"))
Output:
20.0 13.33 -15.34 -32.25 ValueError: could not convert string to float: 'abcd'
# for NaN
print(float("nan"))
print(float("NaN"))
# for inf/infinity
print(float("inf"))
print(float("InF"))
print(float("InFiNiTy"))
print(float("infinity"))
Output:
nan nan inf inf inf inf
