Python Program to Convert a list of multiple integers into a single integer
Given a list of integers, write a Python program to convert the given list into a single integer.
Examples:
Input : [1, 2, 3] Output : 123 Input : [55, 32, 890] Output : 5532890There are multiple approaches possible to convert the given list into a single integer. Let’s see each one by one.
Approach #1 : Naive Method
Simply iterate each element in the list and print them without space in between.
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# Python3 program to convert a list
# of integers into a single integer
# creating a list
lst = [12, 15, 17]
# iterating each element
for i in lst:
print[i, end=""]
|
Output:
121517
Approach #2 : Using join[]
Use the join[] method of Python. First convert the list of integer into a list of strings[ as join[] works with strings only]. Then, simply join them using join[] method. It takes a time complexity of O[n].
|
# Python3 program to convert a list
# of integers into a single integer
def convert[list]:
# Converting integer list to string list
s = [str[i] for i in list]
# Join list items using join[]
res = int["".join[s]]
return[res]
# Driver code
list = [1, 2, 3]
print[convert[list]]
|
Output:
123
Approach #3 : Using map[]
Another approach to convert a list of multiple integers into a single integer is to use map[] function of Python with str function to convert the Integer list to string list. After this, join them on the empty string and then cast back to integer.
|
# Python3 program to convert a list
# of integers into a single integer
def convert[list]:
# Converting integer list to string list
# and joining the list using join[]
res = int["".join[map[str, list]]]
return res
# Driver code
list = [1, 2, 3]
print[convert[list]]
|
Output:
123
Approach #4 : Multiplying by corresponding power of 10
A more mathematical way, which does not require to convert the integer list to string list is, to multiply each integer element with its corresponding power of 10, and then summing it up. It takes a time complexity of O[n].
|
# Python3 program to convert a list
# of integers into a single integer
def convert[list]:
# multiply each integer element with its
# corresponding power and perform summation
res = sum[d * 10**i for i, d in enumerate[list[::-1]]]
return[res]
# Driver code
list = [1, 2, 3]
print[convert[list]]
|
Output:
123A small variation to this program leads to less computation in calculation of sum, i.e. using reduce[]. This makes use of Horner’s rule, which factors the polynomial representing the number to reduce the number of multiplications.
|
res = functools.reduce[lambda total, d: 10 * total + d, list, 0]
|
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Python: Convert a list of multiple integers into a single integer
Last update on October 08 2020 09:21:10 [UTC/GMT +8 hours]Convert a list of multiple integers into a single integer in Python
PythonServer Side ProgrammingProgramming
Sometimes we may have a list whose elements are integers. There may be a need to combine all these elements and create a single integer out of it. In this article we will explore the ways to do that.
using string concatenation to Convert a list of multiple integers into a single integer
If you want to concatenate a list of numbers into a single string, iterate over the list using a loop and add all the elements into a variable using string concatenation. The str[] function allows you to convert any variable of any data type to a string. The code below shows how to apply the str[] function and for the loop to convert a list of integers into a single integer.
#Using String Concatenation
List1 = [1, 2, 3, 4, 5] # declaring a list
# create a variable to store final integer
var = ''
#iterate over the list elements
for element in List1:
# converting integer to string and adding into variable
var += str[element]
# converting back into integer and printing the final result
print[int[var]]
Output:
12345[Python Example for Citizen Data Scientist & Business Analyst]
Write a Python program to convert a list of multiple integers into a single integer.
Sample Solution
Python Code:
L = [11, 33, 50]
print["Original List: ",L]
x = int["".join[map[str, L]]]
print["Single Integer: ",x]
Sample Output:
Original List: [11, 33, 50] Single Integer: 113350“how to convert integers into list in python” Code Answer’s
python make integer into a list
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