Percentage number format in python

How To Print A Percentage Value In Python?

Different fields like Machine learning, Data science, and Deep learning make use of ‘data’ to build different models. We perform different tasks on the ‘data’; some numbers/results are in the form of ‘Percentage values‘. Let’s understand how to print a percentage value in Python.

The domains like Machine learning and Data science build models using Python language. Sometimes, these models perform mathematical calculations, and results are printed in the form of percentage values. For example, The accuracy of every model is printed in the form of percentages, like 99.7%, or 98.5%. These percentage values are very important in this model for analysis.

In some models, we need to use mathematical formulas to evaluate the results. For example, very basic operations like 1.0/3.0 = 0.333, can be converted into the percentage value i.e. 33%. These operations may be a small part of the big calculations. Let’s see the percentage values in detail.

What is Percentage Value?

The percentage value is a result of dividing two numbers and multiplying the result by 100. The percentage value is always represented with the ‘%’ suffix. Let’s see some simple examples to understand the percentage values.

How to Convert the 4/5 in Percentage Value?

The result of 4/5 is 0.8. After multiplication, the value becomes 80%. The final result is ‘80%’. In this way, we can calculate the percentage values.

It is very simple when we perform these calculations manually or using a calculator. There are many methods in Python language to print percentage values. Let’s see the examples.

How to Print a Percentage Value in Python?

There are different methods in Python to print the percentage value. All methods are easy and understandable. Let’s see the examples one by one.

Example 1: Print Percentage Value Using Format Function in Python

The format function in Python is used to replace something in the string. The format function is used to replace every data type like integer, float, string, character, etc. So, it becomes easy when we use the format method to print the percentage value in Python.

Number = 0.75 Percentage_value = "".format(Number) print(Percentage_value)

In example 1, The Number holds the float value ‘0.75’ which is used in the .format() function. The second line of code consists of syntax “”, which is used to print the % sign and percentage calculation without any precision. This value will be replaced by the ‘Number’ and printed in the next line.

The output of example 1 is 75% which is correct!

Example 2: Print Percentage Value Using Format Function in Python (With Precision)

Format function can be used to print the percentage values with precision. Let’s implement the example to see the result.

In this code, “” denotes the precision of two numbers in the output.

The output of example 2 is 88.89% which is correct!

Example 3: Print Percentage Value Using F-string in Python

The f-string in Python works similarly as a format function. The f-string is used with curly braces, and ‘f’ is used as a prefix. This f-string will replace the things from the curly braces with the given string. Here, we’ll replace the original value with the percentage value.

Number = 0.53 Percentage_value = f"" print(Percentage_value)

In this example 3, we use f-string instead of the format function but the working is the same. The Number contains the value and the ‘:.0%‘ syntax will help to convert an original value into a percentage value. Let’s see the result.

Example 4: Print Percentage Value Using F-string in Python (With Precision)

Here, let’s print the percentage value using f-string in Python.

Here, in this example 4, the percentage value is printed with the 2 precision places, ‘.2%’ denotes the 2-precision points.

The output of example 4 is ‘53.73%’ which is correct!

Example 5: Print Percentage Value Using Formula

There is simple technique/ formula to print the percentage value in Python, which is very simple but for knowledge, we can implement it.

Here, in this example 5, the formula to get the percentage value is directly used. The simple string is printed with a ‘%’ sign. After comparing all the examples, this one is the easiest technique to print percentage values in Python.

Summary

This article covers the topic of how to print percentage values in detail. Some basic topics like, what is percentage value? how to get the percentage value? printing the percentage value using different functions like format and f-string, examples with precision is also given. Hope you will enjoy this article.

References

Do read the official documentation on format and f-string for details.

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How to Print a Percentage Value in Python?

To print a percentage value in Python, use the str.format() method or an f-string on the format language pattern «» . For example, the f-string f»» will convert variable your_number to a percentage string with 0 digits precision.

Simply run those three basic statements in your shell:

As a more Pythonic alternative to step number 2, you can use f-strings such as in percentage = f»» for Python version 3.6 and above.

Here’s the minimal 3-step code example to convert a numeric value to a string that is formatted as a percentage value:

# 1. Create a float or integer number: your_number = 0.42 # 2. Convert the number to a string value: percentage = "".format(your_number) # alternative for Python 3.6+: percentage = f"" # 3. Print the result print(percentage)

What does the format string «» mean?

• :% – The colon symbol followed by the percentage symbol means “convert it to a percentage number”.
• .0 – The dot symbol followed by the zero means “use zero digits after the decimal number”.

If you want to include more digits and accomplish a higher precision, use a larger number after the dot such as in «» for two digits or «» for thirteen digits.

print("".format(2/3)) # 67% print("".format(2/3)) # 66.67% print("".format(2/3)) # 66.6666666666667%

? Instead of using the str.format() function, you can also use f-strings for Python 3.6 and newer versions. For example, f»» would convert the numeric value stored in variable x to a percentage number without a decimal digit.

Here are the same three examples as in the previous code snippet—but using f-strings instead:

x = 2/3 print(f"") # 67% print(f"") # 66.67% print(f"") # 66.6666666666667%

This is even more concise and it is the most Pythonic version for Python 3.6 and above. You can learn everything about the differences of f-strings and the more traditional str.format() here.

Lazy Non-Format Alternative

If you’re a bit lazy about f-strings and you always have to look up the syntax, you can simply use the round() built-in method on the fractional number normalized to the 1-100 percentage range. Then, convert the result to a string and use string concatenation to append a suffix ‘%’ symbol.

These three steps will do the trick:

x = 2/3 percentage = str(round(x*100)) + '%' print(percentage) # 67%

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Formatting Numbers for Printing in Python

Hey there, and welcome to another Python snippet post. Let’s take a look at how to print formatted numbers. We’ll cover rounding, thousands separators, and percentages.

Before we dive in, here’s a quick image overview:

String formatting is actually a surprisingly large topic, and Python has its own internal mini language just for handling the many formatting options available to us. Here we’re just going to focus on a few examples involving numbers, but there is a great deal more to explore.

Format numbers rounded to certain decimal places

First let’s take a look at formatting a floating point number to a given level of precision. There are two ways we can do this: we can specify how many significant figures we want overall, or we can specify how many significant figures we want after the decimal point. Let’s start with the former.

To specify a level of precision, we need to use a colon ( : ), followed by a decimal point, along with some integer representing the degree of precision. We place this inside the curly braces for an f-string, after the value we want to format. You can also use the format method instead, which I’ll demonstrate below.

x = 4863.4343091 # example float to format print(f"") # f-string version print("".format(x)) # format method version 

In both cases we get the same result: 4863.43 .

As we can see, our very long float got shortened down to just 6 figures. An interesting thing to note is that this formatting operation actually performs rounding, so if x had a value of 4863.435 , the number printed would actually be 4863.44 . This uses bankers’ rounding (explained here).

If we specify fewer figures than we have in the integer portion of the float, we end up with an exponent representation instead:

x = 4863.4343091 print(f"") # 4.86e+03 

4.86e+03 means 4.86 x 10³ , or 4.86 x 1000 , which is 4860 . Looking at this result, we see that we got three significant figures, as we requested.

So how do we specify 3 decimal places? We just need to add an f .

x = 4863.4343091 print(f"") # 4863.434 

f indicates that we want our float displayed as a «fixed point number»: in other words, we want a specific number of digits after the decimal point. We can use f on its own as well, which defaults to 6 digits of precision:

x = 4863.4343091 print(f"") # 4863.434309 

Display separator character between thousands

For large numbers we often write a separator character (usually a comma, space, or period) to make it easier to read. We can specify this in Python using a comma or underscore character after the colon.

x = 1000000 print(f"") # 1,000,000 print(f"") # 1_000_000 

This also works with floats, and the precision formatting, with the comma coming first:

x = 4863.4343091 print(f"") # 4,863.434 print(f"") # 4_863.434 

Format floating point numbers as percentages

We can format a number as a percentage by simply adding the percent symbol at the end of our formatting options instead of f :

questions = 30 correct_answers = 23 print(f"You got correct!") # You got 76.67% correct! 

When formatting a number as a percentage, the level of precision always refers to the number of digits after the decimal point.

Wrapping Up

That’s it for our very brief dive into formatting numbers. There’s so much more to learn, and we’ll be tackling this in future posts, so make sure to follow us on Twitter to keep up to date with all our content.

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Phil Best

I’m a freelance developer, mostly working in web development. I also create course content for Teclado!

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