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Python – List Elements with given digit

  • Last Updated : 12 Aug, 2021

Given list of elements and a digit K, extract all the numbers which contain K digit.

Input : test_list = [56, 72, 875, 9, 173], K = 5 
Output : [56, 875] 
Explanation : 56 and 875 has “5” as digit, hence extracted.

Input : test_list = [56, 72, 875, 9, 173], K = 4 
Output : [] 
Explanation : No number has 4 as digit. 
 

Method #1 : Using list comprehension + str()

This is one of the ways in which this task can be performed. In this, we convert digit and element to string and then check if its inside that element. The element iteration is done inside list comprehension to get one-liner solution.

Python3




# Python3 code to demonstrate working of
# Elements with K digit
# Using list comprehension + str()
 
# initializing list
test_list = [56, 72, 875, 9, 173]
 
# printing original list
print("The original list is : " + str(test_list))
 
# initializing K
K = 7
 
# extracting all elements with digit K using
# in operator after string conversion using str()
res = [ele for ele in test_list if str(K) in str(ele)]
 
# printing result
print("Elements with digit K : " + str(res))
Output
The original list is : [56, 72, 875, 9, 173]
Elements with digit K : [72, 875, 173]

Method #2 : Using filter() + lambda + str()

This is yet another way to solve this problem. In this, we use filter() + lambda along with str() to check conditionals and extract required elements.

Python3




# Python3 code to demonstrate working of
# Elements with K digit
# Using filter() + lambda + str()
 
# initializing list
test_list = [56, 72, 875, 9, 173]
 
# printing original list
print("The original list is : " + str(test_list))
 
# initializing K
K = 7
 
# using filter() and lambda to perform conditionals
# using str() to perform data type conversions
res = list(filter(lambda ele: str(K) in str(ele), test_list))
 
# printing result
print("Elements with digit K : " + str(res))
Output
The original list is : [56, 72, 875, 9, 173]
Elements with digit K : [72, 875, 173]

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