numbers = [23.23, 0.1233, 1.0, 4.223, 9887.2]
for x in numbers:
print("{:10.4f}".format(x))
prints
23.2300
0.1233
1.0000
4.2230
9887.2000
The format specifier inside the curly braces follows the Python format string syntax. Specifically, in this case, it consists of the following parts:
- The empty string before the colon means "take the next provided argument to
format()" – in this case thexas the only argument. - The
10.4fpart after the colon is the format specification. - The
fdenotes fixed-point notation. - The
10is the total width of the field being printed, lefted-padded by spaces. - The
4is the number of digits after the decimal point.
Top answer 1 of 14
729
numbers = [23.23, 0.1233, 1.0, 4.223, 9887.2]
for x in numbers:
print("{:10.4f}".format(x))
prints
23.2300
0.1233
1.0000
4.2230
9887.2000
The format specifier inside the curly braces follows the Python format string syntax. Specifically, in this case, it consists of the following parts:
- The empty string before the colon means "take the next provided argument to
format()" – in this case thexas the only argument. - The
10.4fpart after the colon is the format specification. - The
fdenotes fixed-point notation. - The
10is the total width of the field being printed, lefted-padded by spaces. - The
4is the number of digits after the decimal point.
2 of 14
256
It has been a few years since this was answered, but as of Python 3.6 (PEP498) you could use the new f-strings:
numbers = [23.23, 0.123334987, 1, 4.223, 9887.2]
for number in numbers:
print(f'{number:9.4f}')
Prints:
23.2300
0.1233
1.0000
4.2230
9887.2000
EEVblog
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Python 3 float to formatted string to always fill a fixed ...
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How I convert float to string in this case?
You shouldn't call your variable sum, as that's a name of a built in function: https://docs.python.org/3/library/functions.html#sum Your problem however, stems from trying to add a string to a float. Could you please tell me, what is Adam + 5? Well, you can't, because it makes no mathematical sense. You didn't save the string representation str(sum), so sum never changed to a string What your research found is f-strings and they are very easy to use. Try: print(f"the sum of the values is {sum}") Simply, put an f before a string starts, then any string that you want goes between " and ", while any variables or other values go between { and } More on reddit.com
4
2
August 21, 2022Convert float to string without losing precision.
Use f-strings/format specifiers. num = 12.78 print(f'{num:.6f}') # prints 12.780000 The :.6f formats the float (f) num such that there are 6 decimal places. More on reddit.com
5
1
February 23, 2021New format specifiers for string formatting of floats with SI and IEC prefixes - Ideas - Discussions on Python.org
I was thinking of writing a PEP to support formatting floats with SI (decimal) and IEC (binary) prefixes natively for float (and maybe other types if makes sense) but wanted to feel it out first. I’ve implemented what I want to propose in the Prefixed package as a subclass of float. More on discuss.python.org
0
May 19, 2023Python 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
18
5
July 29, 2024Videos
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Top answer 1 of 8
259
With Python < 3 (e.g. 2.6 [see comments] or 2.7), there are two ways to do so.
# Option one
older_method_string = "%.9f" % numvar
# Option two
newer_method_string = "{:.9f}".format(numvar)
But note that for Python versions above 3 (e.g. 3.2 or 3.3), option two is preferred.
For more information on option two, I suggest this link on string formatting from the Python documentation.
And for more information on option one, this link will suffice and has info on the various flags.
Python 3.6 (officially released in December of 2016), added the f string literal, see more information here, which extends the str.format method (use of curly braces such that f"{numvar:.9f}" solves the original problem), that is,
# Option 3 (versions 3.6 and higher)
newest_method_string = f"{numvar:.9f}"
solves the problem. Check out @Or-Duan's answer for more info, but this method is fast.
2 of 8
82
Python 3.6
Just to make it clear, you can use f-string formatting. This has almost the same syntax as the format method, but make it a bit nicer.
Example:
print(f'{numvar:.9f}')
More reading about the new f string:
- What's new in Python 3.6 (same link as above)
- PEP official documentation
- Python official documentation
- Really good blog post - talks about performance too
Here is a diagram of the execution times of the various tested methods (from last link above):
GeeksforGeeks
geeksforgeeks.org › python › python-list-of-float-to-string-conversion
Python - List of float to string conversion - GeeksforGeeks
July 12, 2025 - List comprehension is a Pythonic way to iterate over the list and convert each element to a string. ... List comprehension iterates through the list a and applies str(i) to each element.
Reddit
reddit.com › r/learnpython › how i convert float to string in this case?
r/learnpython on Reddit: How I convert float to string in this case?
August 21, 2022 -
I tried
n1=input('First number')
n2=input('Second number')
sum = float(n1) + float(n2)
str(sum)
print('The sum of the values is: ' + sum)My error is:
TypeError: can only concatenate str (not "float") to str
I tried googling this error and got some answers like print(f' which I didn't really understand, and some others that looked a little complicated, I am very new.
I am trying to improve my googling skills.
Top answer 1 of 4
4
You shouldn't call your variable sum, as that's a name of a built in function: https://docs.python.org/3/library/functions.html#sum Your problem however, stems from trying to add a string to a float. Could you please tell me, what is Adam + 5? Well, you can't, because it makes no mathematical sense. You didn't save the string representation str(sum), so sum never changed to a string What your research found is f-strings and they are very easy to use. Try: print(f"the sum of the values is {sum}") Simply, put an f before a string starts, then any string that you want goes between " and ", while any variables or other values go between { and }
2 of 4
3
Just as you converted the strings to floats with float(), you can do the opposite with str(). print("The sum of the values is: " + str(sum)) Now, print() can also take multiple arguments, so you instead of the + for string concatenation, you can do this: print("The sum of the values is:", sum) Now, you should learn f-string formatting. It's not tough once you get the hang of it. print(f"The sum of the values is: {sum}") # no format control print(f"The sum of the values is: {sum:.2f}") # 2-decimal places That says, "Format the floating point number, sum, to two decimal places." And, do not use sum for a variable name. Doing so overwrites the sum() function.
Real Python
realpython.com › how-to-python-f-string-format-float
How to Format Floats Within F-Strings in Python – Real Python
April 24, 2024 - To use Python’s format specifiers in a replacement field, you separate them from the expression with a colon (:). As you can see, your float has been rounded to two decimal places. You achieved this by adding the format specifier .2f into the replacement field. The 2 is the precision, while the lowercase f is an example of a presentation type. You’ll see more of these later. Note: When you use a format specifier, you don’t actually change the underlying number. You only improve its display. Python’s f-strings also have their own mini-language that allows you to format your output in a variety of different ways.
Medium
medium.com › @coucoucamille › float-formatting-in-python-ccb023b86417
Simple Float Formatting in Python | by Coucou Camille | Medium
June 15, 2022 - Simple Float Formatting in Python Python’s built-in format() function allows you to format float in any way you prefer. 1. Round Float to 2 Decimal Places Syntax: {:.2f}.format(num) for rounding to …
Python
docs.python.org › 3 › library › string.html
Common string operations — Python 3.14.3 documentation
Source code: Lib/string/__init__.py String constants: The constants defined in this module are: Custom String Formatting: The built-in string class provides the ability to do complex variable subst...
Finxter
blog.finxter.com › python-convert-float-to-string
Python Convert Float to String – Be on the Right Side of Change
March 9, 2024 - The most Pythonic way to convert a float to a string is to pass the float into the built-in str() function. For example, str(1.23) converts the float 1.23 to the string '1.23'. ... To set the decimal precision after the comma, you can use the f-string formatting functionality in Python 3.
CoenRaets
jsonviewer.ai › python-float-to-string
Python Float to String [Explained with Code Examples] - JSON Viewer
July 5, 2023 - In the example above, the float_num ... represents the float value 3.14159 rounded to two decimal places as a string. The % operator is commonly used for string formatting in Python, similar to how it’s used in C’s printf() function....
mkaz.blog
mkaz.blog › working-with-python › string-formatting
Python String Formatting: Complete Guide
Debugging: f"{variable=}" shows both name and value (Python 3.8+) Avoid % formatting - Legacy method, use only for compatibility · # Most common usage patterns name = "Alice" score = 95.67 print(f"Hello {name}! Your score is {score:.1f}%") # Output: Hello Alice! Your score is 95.7% F-strings (formatted string literals) are the modern standard for string formatting. F-strings are prefixed with f or F and allow you to embed expressions inside curly braces {}.
AskPython
askpython.com › home › python floating point formatting: 2 simple methods
Python Floating Point Formatting: 2 Simple Methods - AskPython
April 10, 2025 - In this example, the :.2f inside the curly braces states that the floating-point number should be formatted with two decimal places. Running this code would output 123.46. ... Here, :10.2f states that the total width of the formatted string should be 10 characters, including two decimal places. The output, in this case, would be 123.46 · Python’s format method offers a versatile approach to string formatting.
Reddit
reddit.com › r/learnpython › convert float to string without losing precision.
r/learnpython on Reddit: Convert float to string without losing precision.
February 23, 2021 -
I am looking to manipulate a data frame of floats which all need 6 decimal points after manipulation.
I am looking to add brackets and () around the floats based on conditionals which is why I need to convert to strings. I then can concat the two strings together
However when I convert to str, it reduces the number of decimals to 2.
For example
-35.920000 Original Dataframe
Converted to str
-35.92 After conversion
If I convert the string back to a float, it does not retain the 6 decimals from the original df.
My understanding is both values are stored the same and they both are logically = when checked in the notebook , but for management reasons I am trying to see if there is a way to coerce the string method the take a literal copy of the float, rather than reducing it down.
Sorry for the formatting, I am on mobile .
Thanks
Quora
quora.com › How-can-I-convert-a-float-to-a-string-in-Python
How to convert a float to a string in Python - Quora
Answer (1 of 7): # First take any variable and assign any value to it float = 1.2 # Next take another variable(result in this code) # and use python str keyword to convert float value # to str and assign that value to another variable(result in this code) result = str(float) # print the seco...
Python Pool
pythonpool.com › home › blog › python float to string conversion using 10 different methods
Python float to string Conversion Using 10 Different Methods - Python Pool
June 14, 2021 - First, let us look at the float; this kind of data type returns floating-point numbers like- 3.45,8.9, etc. This data type also returns the value for a string of numbers such as “8”, “6”, etc. Now coming to the other data type, which is a string. String data type we can understand it as an array of byte-like Unicode characters.
Delft Stack
delftstack.com › home › howto › python › python format float to string
How to Format a Floating Number to String in Python | Delft Stack
February 2, 2024 - In the following example, we’re using the "{:.3f}" format specification to ensure that each number in the list is displayed with three decimal places. This process allows for consistent and controlled formatting of floating-point numbers within a list. ... # python 3.x list = [18.292164, 52.452189, 999.1212732] for numbers in list: print("{:.3f}".format(numbers))
PyFormat
pyformat.info
PyFormat: Using % and .format() for great good!
With this site we try to show you the most common use-cases covered by the old and new style string formatting API with practical examples. All examples on this page work out of the box with with Python 2.7, 3.2, 3.3, 3.4, and 3.5 without requiring any additional libraries.
Python.org
discuss.python.org › ideas
New format specifiers for string formatting of floats with SI and IEC prefixes - Ideas - Discussions on Python.org
May 19, 2023 - I was thinking of writing a PEP to support formatting floats with SI (decimal) and IEC (binary) prefixes natively for float (and maybe other types if makes sense) but wanted to feel it out first. I’ve implemented what I…
Mkyong
mkyong.com › home › python › python – how to convert float to string
Python - How to convert float to String - Mkyong.com
December 14, 2018 - In Python, we can use str() to convert float to String.
Python Reference
python-reference.readthedocs.io › en › latest › docs › functions › format.html
format — Python Reference (The Right Way) 0.1 documentation
The precision is a decimal number ... for a floating point value formatted with ‘g’ or ‘G’. For non-number types the field indicates the maximum field size - in other words, how many characters will be used from the field content. The precision is not allowed for integer values. Determines how the data should be presented. The available string presentation ...