Python: Remove first specified number of elements from a given list satisfying a condition
Python List: Exercise - 160 with Solution
Write a Python program to remove first specified number of elements from a given list satisfying a condition.
Remove the first 4 number of even numbers from the following list:
[3,10,4,7,5,7,8,3,3,4,5,9,3,4,9,8,5]
Output:
[3, 7, 5, 7, 3, 3, 5, 9, 3, 4, 9, 8, 5]
Sample Solution:
Python Code:
def condition_match(x):
return ((x % 2) == 0)
def remove_items_con(data, N):
ctr = 1
result = []
for x in data:
if ctr > N or not condition_match(x):
result.append(x)
else:
ctr = ctr + 1
return result
nums = [3,10,4,7,5,7,8,3,3,4,5,9,3,4,9,8,5]
N = 4
print("Original list:")
print(nums)
print("\nRemove first 4 even numbers from the said list:")
print(remove_items_con(nums, N))
Sample Output:
Original list: [3, 10, 4, 7, 5, 7, 8, 3, 3, 4, 5, 9, 3, 4, 9, 8, 5] Remove first 4 even numbers from the said list: [3, 7, 5, 7, 3, 3, 5, 9, 3, 4, 9, 8, 5]
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Previous: Write a Python program to append the same value /a list multiple times to a list/list-of-lists.
Next: Write a Python program to check if a given list is strictly increasing or not. Moreover, If removing only one element from the list results in a strictly increasing list, we still consider the list true.
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Python: Tips of the Day
Find current directory and file's directory:
To get the full path to the directory a Python file is contained in, write this in that file:
import os dir_path = os.path.dirname(os.path.realpath(__file__))
(Note that the incantation above won't work if you've already used os.chdir() to change your current working directory, since the value of the __file__ constant is relative to the current working directory and is not changed by an os.chdir() call.)
To get the current working directory use
import os cwd = os.getcwd()
Documentation references for the modules, constants and functions used above:
- The os and os.path modules.
- The __file__ constant
- os.path.realpath(path) (returns "the canonical path of the specified filename, eliminating any symbolic links encountered in the path")
- os.path.dirname(path) (returns "the directory name of pathname path")
- os.getcwd() (returns "a string representing the current working directory")
- os.chdir(path) ("change the current working directory to path")
Ref: https://bit.ly/3fy0R6m
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