The float() method returns a floating point number from a number or a string.
Example
int_number = 25
# convert int to float
float_number = float(int_number)
print(float_number)
# Output: 25.0
float() Syntax
The syntax for float() is:
float([x])
float() Parameters
The float() method takes a single parameter:
- x (Optional) - number or string that needs to be converted to floating point number
If it's a string, the string should contain decimal points
| Parameter Type | Usage |
|---|---|
| Float number | Use as a floating number |
| Integer | Use as an integer |
| String | Must contain decimal numbers. Leading and trailing whitespaces are removed. Optional use of "+", "-" signs. Could contain NaN, Infinity, inf (lowercase or uppercase). |
float() Return Value
The float() method returns:
- Equivalent floating point number if an argument is passed
- 0.0 if no arguments passed
OverflowErrorexception if the argument is outside the range of Python float
Example 1: How float() works in Python?
# for integers
print(float(10))
# for floats
print(float(11.22))
# for string floats
print(float("-13.33"))
# for string floats with whitespaces
print(float(" -24.45\n"))
# string float error
print(float("abc"))
Output
10.0 11.22 -13.33 -24.45 ValueError: could not convert string to float: 'abc'
Example 2: float() for infinity and Nan(Not a number)?
# 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