Python: Find the last occurrence of a specified item in a given list
Python List: Exercise - 162 with Solution
Write a Python program to find the last occurrence of a specified item in a given list.
Sample Solution:
Python Code:
def last_occurrence(l1, ch):
return ''.join(l1).rindex(ch)
chars = ['s','d','f','s','d','f','s','f','k','o','p','i','w','e','k','c']
print("Original list:")
print(chars)
ch = 'f'
print("Last occurrence of",ch,"in the said list:")
print(last_occurrence(chars, ch))
ch = 'c'
print("Last occurrence of",ch,"in the said list:")
print(last_occurrence(chars, ch))
ch = 'k'
print("Last occurrence of",ch,"in the said list:")
print(last_occurrence(chars, ch))
ch = 'w'
print("Last occurrence of",ch,"in the said list:")
print(last_occurrence(chars, ch))
Sample Output:
Original list: ['s', 'd', 'f', 's', 'd', 'f', 's', 'f', 'k', 'o', 'p', 'i', 'w', 'e', 'k', 'c'] Last occurrence of f in the said list: 7 Last occurrence of c in the said list: 15 Last occurrence of k in the said list: 14 Last occurrence of w in the said list: 12
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Previous: 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.
Next: Write a Python program to get the index of the first element which is greater than a specified element.
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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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