In this article, we will see what is and various examples of “Python Float Function”. It will help you in implementing this concept and get a tight grip over this.
What is the Python float() method?
The Python float() function is a built-in Python function that converts the given value (number or string) into a floating-point number and returns the result. If the float() method fails to convert string to float then it raises the ValueError.
The Syntax of float() is:
float(Parameter value)
Parameter Value:
A number or a string that can be converted into a floating-point number.
Parameter is optional. If there is no parameter then it returns 0.0.
Note: If the value is a string then it should contain a decimal point and the valid argument should contain some numeric value.
Return Values
The float() function returns a floating-point value equivalent to the number passed as is or in the form of a string.
Errors
This method raises exceptions when it receives invalid parameter value.
- ValueError
- TypeError
ValueError – Python ValueError is raised when a Python function receives an argument of the correct type but a wrong value.
TypeError – Python TypeError is raised when a Python function receives an argument is not of the expected type
Python float() function examples
Example 1: float() function with +ve number values
Let’s pass positive values and see how float() method converts to an equivalent floating-point value.
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print(float(0)) print(float(1)) print(float(0.0)) print(float(1.0)) print(float(1.1001)) print(float(100)) |
Output:
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0 1 0.0 1.0 1.1001 100 |
Example 2: float() function with -ve number values
Let’s pass negative values and see how float() method converts to an equivalent floating-point value.
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print(float(-1)) print(float(-1000)) print(float(-0.0)) print(float(-1.1001)) print(float(-1.0)) |
Output:
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-1.0 -1000.0 -0.0 -1.1001 -1.0 |
Example 3: float() function with a string containing numbers
Let’s pass a number in string format and see how float() method converts to an equivalent floating-point value and returns the result.
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print(float('-1')) print(float('0.0')) print(float('-1000')) print(float('1.1001')) print(float(' 1.0000 ')) |
Output:
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-1.0 0.0 -1000.0 1.1001 1.0 |
Note: It ignores the leading and trailing spaces
Example 4: float() for Infinity, Inf and Nan(Not a number)
It also accepts words like infinity and Nan(Not a number).
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print(float('inf')) print(float('InF')) print(float('InFiNiTy')) print(float('infinity')) print(float('nan')) print(float('NaN')) |
Output:
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inf inf inf inf nan nan |
Example 5: float() with invalid inputs
Let’s pass some invalid input values and find how float() method operates with the wrong parameter values.
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inputValues = [None, "STM", "0,1", "1 0", 1+2j] for everyItem in inputValues: try: if isinstance(everyItem, str): print("float('{}') = {}".format(everyItem, float(everyItem))) else: print("float({}) = {}".format(everyItem, float(everyItem))) except Exception as ex: print("float({}) = {}".format(everyItem, ex)) |
Output:
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float(None) = float() argument must be a string or a number, not 'NoneType' float(STM) = could not convert string to float: 'STM' float(0,1) = could not convert string to float: '0,1' float(1 0) = could not convert string to float: '1 0' float((1+2j)) = can't convert complex to float |
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