For converting a string to float you can use float(). Eg.float('1.2123') You can not convert '*' into float because its an operator that's why error is coming.
#observe the code
volume = float(input("Enter volume of sphere in mm^3: "))
input() = Takes input from user and stores it in string
float() = It is used to convert strings to float
Your code is volume = float(input("Enter volume of sphere in mm^3: "))
1st input() takes input from user in string then float() converts it into float.
But a = 1.4*1.0e6 there is no input() function involved thats why it's a float.
You can simply achieve your work by
volume = eval(input("Enter volume of sphere in mm^3: "))
OR
volume = input("Enter volume of sphere in mm^3: ").split("*")
volume = float(volume[0])*float(volume[1])
split(separator)- It splits a string into an array of sub-strings, by a separator string provided by user
You can read about eval from here:- Read abut eval() from here
Answer from Abhay Kumar on Stack OverflowOpenReplay
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Convert String to Float in Python - Scaler Topics
May 5, 2022 - For converting the list of strings ... have to iterate the string list and take the values one by one and then convert the string values to the floating values and then append all the float values to the floating value list...
How to convert string to float in Python? Why is it a float when directly assigned but a string when a user inputs it? - Stack Overflow
My program prompts the user to input the volume of a sphere. This is one of the example input I have to try: 1.4*1.0e6 This is what I have as the prompt right now: volume = float(input("Enter More on stackoverflow.com
Python string to float conversion
I don't know what you mean: >>> a = '1721244344.700249000' >>> float(a) 1721244344.700249 These are all the decimal places. Trailing zeros will always be omitted as they are irrelevant. If you want to show them, do so when you output the value: >>> print(a.format("{:.9}")) 1721244344.700249000 More on reddit.com
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July 29, 2024Is it legal/valid to use float() to convert a string containing integer to float?
Hi, I’m wondering if float(‘10’) (or any integer string) can be safely converted using float() to float number. Documentation of float() states that: the input must conform to the following grammar after leading and trailing whitespace characters are removed: sign ::= "+" | "-" infinity ... More on discuss.python.org
2
December 22, 2022convert string to float?
if you really want to convert "1" of type str to 1 of type int then you can do something like that: ord("1")-48 this returns Unicode value of the digit, which is 48 for "0", 49 for "1", 50 for "2" etc. from that, it should be easy to create a floating point number in the for loop More on reddit.com
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September 22, 2022Videos
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Cherry Servers
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How to Convert String to Float in Python (6 Different Ways) | Cherry Servers
July 25, 2024 - ... Using the float() function is the most common way to convert string to float in Python. What’s more, it is a built-in function which means it comes with standard Python installation.
Top answer 1 of 3
5
For converting a string to float you can use float(). Eg.float('1.2123') You can not convert '*' into float because its an operator that's why error is coming.
#observe the code
volume = float(input("Enter volume of sphere in mm^3: "))
input() = Takes input from user and stores it in string
float() = It is used to convert strings to float
Your code is volume = float(input("Enter volume of sphere in mm^3: "))
1st input() takes input from user in string then float() converts it into float.
But a = 1.4*1.0e6 there is no input() function involved thats why it's a float.
You can simply achieve your work by
volume = eval(input("Enter volume of sphere in mm^3: "))
OR
volume = input("Enter volume of sphere in mm^3: ").split("*")
volume = float(volume[0])*float(volume[1])
split(separator)- It splits a string into an array of sub-strings, by a separator string provided by user
You can read about eval from here:- Read abut eval() from here
2 of 3
-1
ValueError: could not convert string to float: '1.4*1.0e6'
you try to convert formula to float. the most easy way is convert string to formula using eval
volume = eval(input("Enter volume of sphere in mm^3: "))
Hostman
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How to Convert String to Float in Python
March 31, 2025 - In this article we’ve covered a common example of type casting which is converting a string to a float using the float() function. We also used the try/except block to handle conversion errors when the input string format is not valid.
Reddit
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r/learnpython on Reddit: Python string to float conversion
July 29, 2024 -
Hi all, I have a string a = '1721244344.700249000', I want to convert it to a floating value.
Float() is returning only 2 places after decimal point. Like 1721244344.7
Is there a way I can convert the entire string to a floating point value and get all the decimal (upto 9 places after decimal point)?
I have to use python v2.7 for this.
Edit: I do not have problem in printing the all 9 decimal places but I need the floating value so that I can subtract another value so that I get the difference with accuracy upto 9 th decimal point.
Top answer 1 of 5
7
I don't know what you mean: >>> a = '1721244344.700249000' >>> float(a) 1721244344.700249 These are all the decimal places. Trailing zeros will always be omitted as they are irrelevant. If you want to show them, do so when you output the value: >>> print(a.format("{:.9}")) 1721244344.700249000
2 of 5
3
I have to use python v2.7 for this. ?????????!
DigitalOcean
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How to Convert String to Float in Python: Complete Guide with Examples | DigitalOcean
July 10, 2025 - Learn how to convert strings to floats in Python using float(). Includes syntax, examples, error handling tips, and real-world use cases for data parsing.
Python Engineer
python-engineer.com › posts › string-to-float
How to convert a string to float/integer and vice versa in Python - Python Engineer
February 9, 2022 - The result will include the whole number part of the float, as the decimal part is discarded during float to int conversion. ... ```python number_as_string = "3.14159" number_as_float = float(number_as_string) number_as_integer = int(number_as_float) print(number_as_integer) ... A ValueError is also thrown in any other case where the string cannot be converted to a number.
Quora
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How to convert input strings to float() in Python - Quora
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Centron
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How to Convert a String to a Float in Python
February 7, 2025 - This tutorial was tested with Python 3.9.6. We can convert a string to float in Python using the float() function. This is a built-in function used to convert an object to a floating point number.
W3Schools
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Python Casting
Python is an object-orientated language, and as such it uses classes to define data types, including its primitive types. Casting in python is therefore done using constructor functions: int() - constructs an integer number from an integer literal, a float literal (by removing all decimals), or a string literal (providing the string represents a whole number)
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Docs | ServiceNow
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Note.nkmk.me
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Convert a String to a Number (int, float) in Python | note.nkmk.me
April 29, 2025 - In Python, you can convert a string (str) to a number using int() for an integer or float() for a floating-point number. Convert a string to int: int() Convert a string to float: float() Convert a bin ...
Python
docs.python.org › 3 › library › json.html
json — JSON encoder and decoder
2 weeks ago - If None (the default), it is equivalent to int(num_str). This can be used to parse JSON integers into custom datatypes, for example float. parse_constant (callable | None) – If set, a function that is called with one of the following strings: '-Infinity', 'Infinity', or 'NaN'.
Python documentation
docs.python.org › 3 › library › stdtypes.html
Built-in Types — Python 3.14.3 documentation
2 weeks ago - For example, the hexadecimal string 0x3.a7p10 represents the floating-point number (3 + 10./16 + 7./16**2) * 2.0**10, or 3740.0: ... Applying the reverse conversion to 3740.0 gives a different hexadecimal string representing the same number: ... The complex type implements the numbers.Complex abstract base class. complex also has the following additional methods. ... Class method to convert a number to a complex number.
Mermaid
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Entity Relationship Diagrams | Mermaid
Create diagrams and visualizations using text and code.
Godot Engine
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GDScript reference — Godot Engine (stable) documentation in English
GDScript is a high-level, object-oriented, imperative, and gradually typed programming language built for Godot. It uses an indentation-based syntax similar to languages like Python. Its goal is to...
GeeksforGeeks
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Convert String to Float in Python - GeeksforGeeks
July 15, 2025 - It converts a string into a Decimal object, effectively avoiding common floating-point rounding errors. ... eval() function reads and runs a string as a Python expression. It can turn a numeric string like "33.28" into a float. However, it's risky to use with untrusted input because it can run harmful code.
Python.org
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Is it legal/valid to use float() to convert a string containing integer to float? - Python Help - Discussions on Python.org
December 22, 2022 - Hi, I’m wondering if float(‘10’) (or any integer string) can be safely converted using float() to float number. Documentation of float() states that: the input must conform to the following grammar after leading and trailing whitespace characters are removed: sign ::= "+" | "-" infinity ::= "Infinity" | "inf" nan ::= "nan" numeric_value ::= floatnumber | infinity | nan numeric_string ::= [sign] numeric_value where floatnumber, described in Floating point li...