You have a tuple of integers—but you want a single integer. What can you do?
Problem: Given a tuple of values.
t = (1, 2, 3)
Your goal is to convert it to a single integer value.
There are multiple ways of accomplishing this (dependent on what exactly you want to do). Let’s get a quick overview in our interactive Python shell:
Exercise: Modify method 2 to calculate the average and round to the next integer!
Let’s dive into each of the method.
Method 1: sum()
The first way of converting a tuple to an integer, simply sum up all values. The
sum() function is built-in in Python and you can use it on any iterable:
The syntax is
|Sum over all elements in the |
|(Optional.) The default start value is 0. If you define another start value, the sum of all values in the |
Here’s how you can use the
sum() function to sum over all values in an iterable (such as a tuple):
# Method 1: sum() t = (1, 2, 3) i = sum(t) print(i) # 6
In this case, it calculates 1+2+3=6. You can learn more about the
sum() function on this Finxter blog article.
But what if you want to use all tuple values as digits of a larger integer value?
Method 2: str() + list comprehension + join()
List comprehension is a compact way of creating lists. The simple formula is
[expression + context].
- Expression: What to do with each list element?
- Context: What elements to select? The context consists of an arbitrary number of
You can use it in combination with the
sum() function to calculate the integer 123 from the tuple (1, 2, 3)—by using the tuple values as digits of the larger integer.
# Method 2: str() + list comprehension + join() t = (1, 2, 3) i = ''.join(str(x) for x in t) print(int(i)) # 123
Well, to be frank, we didn’t even use list comprehension here—the correct term for
str(x) for x in t is “generator expression”. The difference to list comprehension is that it creates a generator instead of a list.
If you like functional programming, you may like the following method:
Method 3: str() + map() + join()
The map() function creates a new iterable from an iterable by applying a function to each element of the original iterable:
Then, you can join all strings together to a big string. After converting the big string to an integer, you’ve successfully merged all tuple integers to a big integer value.
# Method 3: str() + map() + join() t = (1, 2, 3) i = ''.join(map(str, t)) print(i) # 123
There are many details to the
string.join() method. You can read the detailed tutorial on the Finxter blog. Here’s the short version:
string.join(iterable) method concatenates all the string elements in the
iterable (such as a list, string, or tuple) and returns the result as a new string. The
string on which you call it is the delimiter string—and it separates the individual elements. For example,
'-'.join(['hello', 'world']) returns the joined string
Method 4: Multiple Assignments
If you simply want to get multiple integers by assigning the individual tuple values to integer variables, just use the multiple assignment feature:
# Method 4: multiple assignments t = (1, 2, 3) a, b, c = t print(a) print(b) print(c) ''' 1 2 3 '''
c have the values 1, 2, and 3, respectively.
Where to Go From Here?
Enough theory, let’s get some practice!
To become successful in coding, you need to get out there and solve real problems for real people. That’s how you can become a six-figure earner easily. And that’s how you polish the skills you really need in practice. After all, what’s the use of learning theory that nobody ever needs?
Practice projects is how you sharpen your saw in coding!
Do you want to become a code master by focusing on practical code projects that actually earn you money and solve problems for people?
Then become a Python freelance developer! It’s the best way of approaching the task of improving your Python skills—even if you are a complete beginner.
Join my free webinar “How to Build Your High-Income Skill Python” and watch how I grew my coding business online and how you can, too—from the comfort of your own home.
While working as a researcher in distributed systems, Dr. Christian Mayer found his love for teaching computer science students.
To help students reach higher levels of Python success, he founded the programming education website Finxter.com. He’s author of the popular programming book Python One-Liners (NoStarch 2020), coauthor of the Coffee Break Python series of self-published books, computer science enthusiast, freelancer, and owner of one of the top 10 largest Python blogs worldwide.
His passions are writing, reading, and coding. But his greatest passion is to serve aspiring coders through Finxter and help them to boost their skills. You can join his free email academy here.