Python: Find the longest common sub-string from two given strings
Python String: Exercise-69 with Solution
Write a Python program to find the longest common sub-string from two given strings.
Sample Solution:-
Python Code:
from difflib import SequenceMatcher
def longest_Substring(s1,s2):
seq_match = SequenceMatcher(None,s1,s2)
match = seq_match.find_longest_match(0, len(s1), 0, len(s2))
# return the longest substring
if (match.size!=0):
return (s1[match.a: match.a + match.size])
else:
return ('Longest common sub-string not present')
s1 = 'abcdefgh'
s2 = 'xswerabcdwd'
print("Original Substrings:\n",s1+"\n",s2)
print("\nCommon longest sub_string:")
print(longest_Substring(s1,s2))
Sample Output:
Original Substrings: abcdefgh xswerabcdwd Common longest sub_string: abcd Original Substrings: abcdefgh xswerabcdwd Common longest sub_string: abcd
Pictorial Presentation:
Flowchart:
Python Code Editor:
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Previous: Write a Python program to create two strings from a given string. Create the first string using those character which occurs only once and create the second string which consists of multi-time occurring characters in the said string.
Next: Write a Python program to create a string from two given strings concatenating uncommon characters of the said strings.
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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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