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Naive string doctests + typehints (#2054)

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* Added doctests

* Added __main__

* Commit suggestion

* Undo changes to keep only doctests and typehints

* Reundo function name with params

* Update naive_string_search.py

* Update naive_string_search.py

* Update naive_string_search.py

* Update naive_string_search.py

Co-authored-by: Christian Clauss <cclauss@me.com>
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mateuszz0000 2020-06-01 15:40:40 +02:00 committed by GitHub
parent 321b1425e3
commit 1a254465e3
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1 changed files with 22 additions and 12 deletions
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34
strings/naive_string_search.py
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@ -1,4 +1,6 @@
"""
https://en.wikipedia.org/wiki/String-searching_algorithm#Na%C3%AFve_string_search
this algorithm tries to find the pattern from every position of
the mainString if pattern is found from position i it add it to
the answer and does the same for position i+1
@ -9,14 +11,25 @@ Complexity : O(n*m)
"""
def naivePatternSearch(mainString, pattern):
patLen = len(pattern)
strLen = len(mainString)
def naive_pattern_search(s: str, pattern: str) -> list:
"""
>>> naive_pattern_search("ABAAABCDBBABCDDEBCABC", "ABC")
[4, 10, 18]
>>> naive_pattern_search("ABC", "ABAAABCDBBABCDDEBCABC")
[]
>>> naive_pattern_search("", "ABC")
[]
>>> naive_pattern_search("TEST", "TEST")
[0]
>>> naive_pattern_search("ABCDEGFTEST", "TEST")
[7]
"""
pat_len = len(pattern)
position = []
for i in range(strLen - patLen + 1):
for i in range(len(s) - pat_len + 1):
match_found = True
for j in range(patLen):
if mainString[i + j] != pattern[j]:
for j in range(pat_len):
if s[i + j] != pattern[j]:
match_found = False
break
if match_found:
@ -24,9 +37,6 @@ def naivePatternSearch(mainString, pattern):
return position
mainString = "ABAAABCDBBABCDDEBCABC"
pattern = "ABC"
position = naivePatternSearch(mainString, pattern)
print("Pattern found in position ")
for x in position:
print(x)
if __name__ == "__main__":
assert naive_pattern_search("ABCDEFG", "DE") == [3]
print(f"{naive_pattern_search('ABAAABCDBBABCDDEBCABC', 'ABC') = }")