Convert String To Floating Javascript
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Michael Zippo
04.11.2021
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Python can only convert a valid numeric value to a floating point value. If you try to convert a value that contains a comma, spaces, or certain characters, you get an error that says "valueerror: cannot convert string to float".
In this guide, we explain what this error means and why it is being reported. Let’s look at an example of this error to help you see how to fix it in your code.
valueerror: Cannot convert string to float
Python provides a method called float () which converts a string to a floating point number.
This method is useful if you need to perform a mathematical operation on a value. You cannot perform calculations on a string; you can perform floating point calculations.
The float () method only allows you to convert strings that appear as a float. This means that a value cannot be converted if:
- A value contains spaces
- A value contains a comma
- A value does not contain any -special characters (ie "inf" is a special character, but "fd" is not)
The error "valueerror: string failed could not be converted to float " generates an error if any of the above three criteria is not met. This is because Python cannot convert a value to a float unless that value appears in a particular way.
An example scenario
Here we write a program that converts US Dollars (USD) to Great Pounds Sterling (GBP).
To start, ask a user to enter the dollar value you want to convert to pounds:
We convert a user’s value between a floating point number so that we can perform a mathematical calculation using the value later.
Next, let’s set the exchange rate from USD to GBP. Currently, 1 USD is worth 0.76 GBP:
With these two values, we can calculate how much our value in USD in GBP is worth. To do this, multiply "dollar_value" by "exchange_rate:
We used a . format () to create a message telling you how much your USD is in GBP. Let’s run our code and see what happens:
Our code is working fine. Let’s see this happens if we try to insert a number into our code that is not formatted correctly:
Our code returns an error.
The Solution
Our code works when we insert a valid floating point value into our program. We cannot rely on every user to do this.
When we tried to enter a value in thousands (2300), we added a comma. This made our floating point number invalid.
To solve this problem we can use a " try ... except " block:
Our program will try to execute the code in the "try" block . If our program fails, the "except" message block will be executed.
Run our code and enter an invalid floating point value.
Our code returns:
Let’s run our code with a valid value:
In both cases our code works In the first case, where we entered an invalid value in our program , the contents of our "except" block executed. In the second case, our program calculated that 23 USD equals GBP.
Conclusion
The "valueerror: could not convert st sound to float" error generates an error when trying to convert an unformatted string to a floating point number floating to a floating.
You can resolve this error by adding a handler that ensures that your code does not continue to execute if the user enters an invalid value. Alternatively, you can add additional input validation before converting a number to float () to ensure that a number is valid.
You are now ready to resolve this common Python error in your code.
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We hope this article has helped you to resolve the problem. Apart from Convert String To Floating Javascript, check other code Python module-related topics.
Want to excel in Python? See our review of the best Python online courses 2023. If you are interested in Data Science, check also how to learn programming in R.
By the way, this material is also available in other languages:
Julia Porretti
London | 2023-02-01
I was preparing for my coding interview, thanks for clarifying this - Convert String To Floating Javascript in Python is not the simplest one. Will use it in my bachelor thesis
Oliver Emmerson
Singapore | 2023-02-01
I was preparing for my coding interview, thanks for clarifying this - Convert String To Floating Javascript in Python is not the simplest one. Will get back tomorrow with feedback
Marie Wu
San Francisco | 2023-02-01
I was preparing for my coding interview, thanks for clarifying this - Convert String To Floating Javascript in Python is not the simplest one. I just hope that will not emerge anymore
