Methods and Functions

Python float()

Float in python returns a float value from either a string or an integer. Float in python takes only one argument as its parameter. Let us learn this in detail. 

Syntax:

float(a)

‘a’ is a number or a string that is converted to the floating value. 

float() Parameters

 The type of arguments that the float () accepts is mentioned below:

  1. A number- the float() accepts an integer or floating numbers as an argument.
  2. Strings- the conditions for the string argument to be considered are given as below:
  • The argument must contain numbers of any type.
  • Any whitespaces on either side of the argument or a new line are ignored by the method.
  • Mathematical Operators can be utilized.
  • It’s possible to have NaN, Infinity, or infinity (any cases)

Return value from float()

Based on the type of arguments passed to the float(), the return type will be:

  • The equivalent floating-point number is returned if an argument is passed.
  • If there are no arguments passed as input, the float() returns 0.0
  • An error will be raised if any string is provided that is not a decimal point number or does not match any of the criteria listed above.
  • If a number is passed that is outside of the Python float range, an OverflowError is returned.

Errors:

If any improper input is provided, an appropriate exception is returned.

  1. ValueError – When you pass an invalid argument, such as a string that doesn’t contain a number
  2. TypeError – When you pass a type argument that it doesn’t recognize, such as a complex number or NoneType, it throws a TypeError exception.

What is Float Used for?

Float() is a Python function that returns the result of converting an integer or a string to a float value. 

Example 1: How float() works in Python?

                    

# for integer arguments

print(float(101))



# for float arguments

print(float(311.22))



# for string float arguments

print(float("-14.33"))



# for string floats that contain whitespaces

print(float(" -24.35\n"))



# string float error  

print(float("Hey, what a beautiful day"))



Output

101.0

311.22

-14.33

-24.35

ValueError: could not convert string to float: 'Hey, what a beautiful day."



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

What is a float input?

If the user wants to take a float integer as the input, the float() must be used to explicitly convert the string value into a float integer.

Example:

a = float(input(“Enter a float value: “))

b = float(input(“Enter a float value: “))

Source Code:

a = float(input(“Enter a float value: “))

b = float(input(“Enter a float value: “))

print(“Sum of a and b:”,a + b)

print(“Multiplication of a and b:”,a * b)

Output:

Enter a float: 23.43

Enter a float: 34.32

Sum of a and b: 57.75

Multiplication of a and b: 804.1176

What is a float variable?

The float variable in Python represents a floating-point number. A decimal point divides the integer and fractional elements of the float variable used to represent the real values.  The float variables have 64-bit precision values. The floating-point numbers that have a value greater than 1.8 x 10^308 exceed the range. In such cases, the number is represented by the string inf in Python.

Example:

                    

print(1.7e308)

  

# greater than 1.8 * 10^308

print(1.82e308)


Output:

1.7e+308

inf

What are Floats and Integers in Python?

Integers, floating-point numbers, and complex numbers are all supported by the Python programming language. 

 float in python

Source Code

Float and integers are variables accepted in Python. A decimal point decides whether the number is an integer or a floating point. 

In Python, if you declare a number without a decimal point it is automatically considered an integer. The values that have a decimal point (e.g., 6.00, 2.543, 233.5, 1.0) are referred to as float. 

Positive whole numbers (e.g., 8, 37, 226), their negative counterparts (e.g., -8, -37, -226), and zero are all examples of integers. In Python, integer variables are written as int. 

Converting an integer value to a Floating-point in Python

The float() is used to convert an integer to float. For example:

                    

Input:

f_numb = float(15)



print(f_numb)



Output:

15.0

After using the float function, we can see the output as 15.0, this indicates that the number has been converted successfully. 

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