How would you split up the number 123456789 into [1,2,3,4,5,6,7,8,9] using Python?
Alex Riley
157k44 gold badges249 silver badges229 bronze badges
asked Jan 20, 2015 at 23:10
0
One way is to turn the number into a string first and then map each character digit back to an integer:
>>> map[int, str[123456789]]
[1, 2, 3, 4, 5, 6, 7, 8, 9]
This does the following:
strturns the integer into a string:'123456789'mapapplies the functionintto each character in this string in turn, turning each one back into an integer value.a list of these integers is returned.
answered Jan 20, 2015 at 23:14
Alex RileyAlex Riley
157k44 gold badges249 silver badges229 bronze badges
7
You can convert the number into a string and then do a list comprehension -
>>>[int[digit] for digit in str[123456789]]
[1, 2, 3, 4, 5, 6, 7, 8, 9]
answered Jan 20, 2015 at 23:18
You can also do this without turning your number into a string like so:
def splitNum[n]:
if n < 10
return [n]
else:
return splitNum[n // 10] + [n % 10]
This method uses recursion, but you can also do this without recursion
def splitNum[n]:
digits = []
while n > 0:
digits.insert[0, n % 10] # add ones digit to front of digits
n = n // 10
return digits
Both use the following facts:
x // 10, because of integer division, "chops off" the ones digit, ie1234 // 10is123x % 10is that ones digit, ie1234 % 10is4
answered Jan 20, 2015 at 23:23
JJW5432JJW5432
6978 silver badges15 bronze badges
2
Use the inbuilt list function in Python in the following way:
a = 123456789
p = str[a]
li = list[p]
s = []
for e in li:
a = int[e]
s.append[a]
print s
From the documentation:
list[iterable] -> new list initialized from iterable's items
EDIT:
Since the list[] method returns a list containing only string elements, I have created an empty list s, and have then used a for loop to iterate through each string element, converted each of those elements to integer, and have then appended those elements inside
the empty list s.
answered Jan 20, 2015 at 23:21
Manas ChaturvediManas Chaturvedi
4,83018 gold badges51 silver badges102 bronze badges
1
Created: May-26, 2021 This tutorial will discuss different methods to split an integer into digits in Python. List comprehension is a much shorter and graceful way to create lists that are to be formed based on given values of an already existing list. In this method, The following code uses list comprehension to split an integer into digits in Python. Output: The number The operation of splitting the integer into digits in Python can be performed without converting the number to string first.
Moreover, this method is about twice as fast as converting it to a string first. The The The following code uses list comprehension, Output: The The The number needs to be already in the string format so that this method could be used. The following code uses the Output: Here, we used the In this method, we use a loop and perform the slicing technique till the specified number of digits [ The following code uses the Output:math.ceil[] and math.log[] Functions to Split
an Integer Into Digits in Pythonmap[] and str.split[] Functions to Split an Integer Into Digits in Pythonfor Loop to
Split an Integer Into Digits in PythonUse List Comprehension to Split an Integer Into Digits in Python
str[] and int[]
functions are also used along with List comprehension to split the integer into digits. str[] and int[] functions are used to convert a number to a string and then to an integer respectively.num = 13579
x = [int[a] for a in str[num]]
print[x]
[1, 3, 5, 7, 9]
num is first converted into a string using str[] in the above code. Then, list comprehension is
used, which breaks the string into discrete digits. Finally, the digits are converted back to an integer using the int[] function.Use the
math.ceil[] and math.log[] Functions to Split an Integer Into Digits in Pythonmath.ceil[] function rounds off a number up to an integer. The math.log[] function provides the natural logarithm of a number. To use both these functions, we should import the math library.math module can be defined as an always accessible and standard module in Python. It provides access to the fundamental C library functions.math.ceil[] and
math.log[] functions to split an integer into digits in Python.import math
n = 13579
x = [[n//[10**i]]%10 for i in range[math.ceil[math.log[n, 10]]-1, -1, -1]]
print[x]
[1, 3, 5, 7, 9]
Use the
map[] and str.split[] Functions to Split an Integer Into Digits in Pythonmap[] function implements a stated function for every item in an iterable. The item is then consigned as a parameter to the function.split[] method, as
the name suggests, is used to split a string into a list. It has a basic syntax and holds two parameters, separator, and the maxsplit.map[] and str.split[] functions to split an integer into digits in Python.str1 = "1 3 5 7 9"
list1 = str1.split[]
map_object = map[int, list1]
listofint = list[map_object]
print[listofint]
[1, 3, 5, 7, 9]
str.split[] method to split the given number in string format into a list of strings containing every number. Then
the map[] function is used, which is utilized to generate a map object which converts each string into an integer. Finally, list[mapping] is used to create a list from the map object.Use a
for Loop to Split an Integer Into Digits in PythonA=1 in this case] and then finally, use the int[] function for
conversion into an integer.int[]+loop+slice to split an integer into digits in Python.str1 = '13579'
# initializing substring
A = 1
# create a result list
result = []
for i in range[0, len[str1], A]:
# convert to int, after the slicing process
result.append[int[str1[i : i + A]]]
print["The resultant list : " + str[result]]
The resultant list : [1, 3, 5, 7, 9]
Related Article - Python Integer
Related Article - Python String