[Tut] Python Tuple to Integer

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Python Tuple to Integer

You have a tuple of integers—but you want a single integer. What can you do?

Problem: Given a tuple of values.

Code:

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:

https://trinket.io/embed/python/bf5faba68b

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

Code:

sum()

function is built-in in Python and you can use it on any iterable:

The syntax is

Code:

sum(iterable, start=0)

:

Argument |
Description

Code:

iterable

|
Sum over all elements in the

Code:

iterable

. This can be a list, a tuple, a set, or any other data structure that allows you to iterate over the elements.
Example:

Code:

sum([1, 2, 3])

returns

Code:

1+2+3=6

.

Code:

start

|
(Optional.) The default start value is 0. If you define another start value, the sum of all values in the

Code:

iterable

will be added to this start value.
Example:

Code:

sum([1, 2, 3], 9)

returns

Code:

9+1+2+3=15

.



Here’s how you can use the

Code:

sum()

function to sum over all values in an iterable (such as a tuple):

Code:

# 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

Code:

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

Code:

[expression + context]

.

• Expression: What to do with each list element?
  
  
• Context: What elements to select? The context consists of an arbitrary number of
  Code:

  for
  and
  Code:

  if
  statements.
  

You can use it in combination with the

Code:

sum()

function to calculate the integer 123 from the tuple (1, 2, 3)—by using the tuple values as digits of the larger integer.

Code:

# 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

Code:

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:



You can pass the

Code:

str()

function into the

Code:

map()

function to convert each tuple element to a string.

Then, you can joinall 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.

Code:

# Method 3: str() + map() + join() t = (1, 2, 3) i = ''.join(map(str, t)) print(i) # 123

There are many details to the

Code:

string.join()

method. You can read the detailed tutorial on the Finxter blog. Here’s the short version:

The

Code:

string.join(iterable)

method concatenates all the string elements in the

Code:

iterable

(such as a list, string, or tuple) and returns the result as a new string. The

Code:

string

on which you call it is the delimiter string—and it separates the individual elements. For example,

Code:

'-'.join(['hello', 'world'])

returns the joined string

Code:

'hello-world'

.

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:

Code:

# Method 4: multiple assignments t = (1, 2, 3) a, b, c = t print(a) print(b) print(c) ''' 1 2 3 '''

Variables

Code:

a

,

Code:

b

, and

Code:

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!

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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.

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