Convert String Float Numeral Into Float in Python

(Last Updated On: 10/10/2023)

In this blog, we will explore a Python program to convert string float numeral into float. By leveraging the power of recursion, we can create a compact and efficient solution to this problem. We will walk through the step-by-step logic and operation of the code, providing a clear understanding of how recursion can be used to solve the task at hand.

In Python, dealing with different data types is a common task. Occasionally, we may come across situations where we need to convert a string representation of a float numeral into an actual float. This conversion allows us to perform mathematical operations or use the float value in various computations.

So, let’s dive in and discover how to convert string float numeral into a float in Python.

Python Program to Convert String Float Numeral Into Float

# Convert string float numeral into float in python
 
string = '55.567'

Float = float(int(string))

print(type(Float))
print('Float Value =', Float)

Code Explanation

Input the String Float Numeral

To begin with, we input a string representing a float numeral. In this case, the string is ‘55.567’.

Convert String to Integer

Since the desired output is a float, we need to convert the string into an integer. This can be achieved by using the int() function, which converts the string ‘55.567’ to an integer.

Convert Integer to Float

Next, we use the float() function to convert the integer obtained from the previous step into a float. The float() function takes an argument and returns its floating-point representation. Next, we apply the int() function to the string ‘55.567’, which converts it to the integer 55. Here, we use the float() function to convert the integer 55 to a float. The resulting float is assigned to the variable Float.

Print the Result

Finally, we print the type of the variable Float using the type() function to verify that it is a float. We also print the value of Float to display the converted float representation.

Output:

Traceback (most recent call last):
  File "<string>", line 5, in <module>
ValueError: invalid literal for int() with base 10: '55.567'

In this code, we try to convert a string into an integer and then a float. In the output we can see that we can’t convert a string float number into an integer thus, we get a value error:

ValueError: invalid literal for int() with base 10: ‘55.567’

Let’s explore some alternative methods:

Using the float() function:

The float() function is a built-in function in Python that directly converts a string to a float. You can simply pass the string as an argument to the float() function, and it will return the corresponding float value. This method is straightforward and concise, as it directly converts the string to a float without the need for any additional steps.

Using the int() function:

If you have a string representing a whole number and you want to convert it to a float, you can use the int() function followed by dividing the result by 1.0 to obtain a float. This method works by converting the string to an integer using the int() function and then dividing it by 1.0, which effectively converts it to a float.

We used the float() method as it is simple and concise, requiring only a single function call to perform the conversion. It is easy to read and understand. Being a standard method in Python for converting numerical values, it is widely used and recognized by Python developers, making it a common and accepted practice. It provides a safer approach for converting a string to a float, especially when dealing with user input or untrusted sources.

Conclusion

We explored how to convert a string float numeral into a float in Python using the int() and float() functions. Converting string numerals into float data types is useful when performing calculations or working with numeric data that requires decimal precision. The int() function helps us convert the string to an integer by removing the decimal part, while the float() function allows us to convert the integer to a float representation.

By applying the concepts discussed in this blog, you can confidently convert string float numerals into float values, enabling you to perform mathematical operations and handle numeric data accurately in your Python programs.

Frequently Asked Questions

Q: What happens if the string float numeral contains non-numeric characters?

A: If the string float numeral contains non-numeric characters, such as letters or symbols, the code will raise a ValueError indicating that the conversion to an integer is not possible.

Q: Can we directly convert the string float numeral into a float without converting it to an integer first?

A: No, we cannot directly convert the string float numeral into a float without first converting it to an integer. The float() function expects a numerical value as its argument, so we need to remove the decimal part by converting it to an integer.

Q: What if the string float numeral has a leading or trailing whitespace?

A: If the string float numeral has leading or trailing whitespace, Python’s float() and int() functions will automatically handle it and convert the numerical part into the respective data types.

Q: Can this code handle string float numerals with different decimal precision?

A: Yes, this code can handle string float numerals with different decimal precision. It converts the string into an integer, which effectively removes the decimal portion, and then converts it to a float, resulting in the desired decimal precision.

Q: What is the significance of printing the type of Float?

A: Printing the type of Float allows us to verify that the conversion was successful and that the variable contains a float value. It helps in debugging and ensuring the code is working as expected.

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