# Python Tuple to Integer

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

## Problem Formulation and Solution Overview

Given a tuple of values.

`t = (1, 2, 3)`

Goal: Convert the tuple to a single integer value.

If you simply pass a tuple `t` into the `int(t)` built-in function, Python will raise a `TypeError: int() argument must be a string, a bytes-like object or a number, not 'tuple'`.

```t = (1, 2, 3)
int(t)```

This doesn’t work! Here’s the error message that appears if you try to do this direct conversion from tuple to int:

``TypeError: int() argument must be a string, a bytes-like object or a number, not 'tuple'``

In principle, there are two ways of converting a tuple to an integer and avoiding this TypeError:

• Select one of the tuple elements `tuple[i]` using tuple indexing of the `i`-th tuple element.
• Aggregate the tuple elements to a single integer value, e.g., summing over all tuple elements or combining their string aggregation.

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 methods.

## Method 1: sum()

The first way of converting a tuple to an integer is to sum up all values. The `sum()` function is built-in in Python and you can use it on any iterable:

The syntax is `sum(iterable, start=0)`:

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 `for` and `if` statements.

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:

You can pass the `str()` function into the `map()` function to convert each tuple element to a string.

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:

The `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 `'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:

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

Variables `a`, `b`, and `c` have the values 1, 2, and 3, respectively.

## Method 5: Reduce Function

After writing this article, I realized that there’s a fifth way to convert a tuple to an integer value:

To convert a tuple to an integer value, use the `reduce()` function from the `functools` library in combination with the lambda function to aggregate the elements using any binary aggregator function such as multiplication, addition, subtraction like so:

• Multiplication: `functools.reduce(lambda aggregate, element: aggregate * element, t)`
• Addition: `functools.reduce(lambda aggregate, element: aggregate + element, t)`
• Subtraction: `functools.reduce(lambda aggregate, element: aggregate - element, t)`

Here’s a basic example using the multiplication aggregation for starters:

```import functools

t = (1, 2, 3)

res = functools.reduce(lambda aggregate, element: aggregate * element, t)
print(res)
# 6
```

Here’s a basic example using the addition aggregation:

```import functools

t = (1, 2, 3)

res = functools.reduce(lambda aggregate, element: aggregate + element, t)
print(res)
# 6
```

Here’s a basic example using the subtraction aggregation:

```import functools

t = (1, 2, 3)

res = functools.reduce(lambda aggregate, element: aggregate - element, t)
print(res)
# -4
```

In case you need some repetition or additional information on the reduce() function, run this video:

💡 Info: The `reduce()` function from Python’s `functools` module aggregates an iterable to a single element. It repeatedly merges two iterable elements into a single one as defined in the function argument. By repeating this, only a single element will remain — the return value.

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