CODEWITHSUNDEEP
python
Murali
Murali

Reputation: 601

How I display 2 words before and after a key search word in Python

Very new to Python programming. How I display 2 words before and after a key search word. In below example I am looking for a search word = lists

Sample:

Line 1: List of the keyboard shortcuts for Word 2000
Line 2: Sequences: strings, lists, and tuples - PythonLearn

Desired results (Lists word only found only in line 2)

Line 2: Sequences: strings, lists, and tuples

Thanks for your help in this.

Upvotes: 1

Views: 1303

Answers (3)

nekomatic
nekomatic

Reputation: 6284

This solution is based on Avinash Raj's second example with these amendments:

  • Allows the number of words to be printed each side of the search word to be varied
  • Uses a list comprehension instead of if inside for, which may be considered more 'Pythonic', though I'm not sure in this case if it's more readable.

.

s = """List of the keyboard shortcuts for Word 2000
Sequences: strings, lists and tuples - PythonLearn"""
findword = 'lists'
numwords = 2

for i in s.split('\n'):
    z = i.split(' ')

    for x in [x for (x, y) in enumerate(z) if findword in y]:
        print(' '.join(z[max(x-numwords,0):x+numwords+1]))

Upvotes: 2

thiruvenkadam
thiruvenkadam

Reputation: 4250

This is the solution I can think of right away for your question :-)

def get_word_list(line, keyword, length, splitter):
    word_list = line.split(keyword)
    if len(word_list) == 1:
        return []
    search_result = []
    temp_result = ""
    index = 0
    while index < len(word_list):
        result = word_list[index].strip().split(splitter, length-1)[-1]
        result += " " + keyword
        if index+1 > len(word_list):
            search_result.append(result.strip())
            break
        right_string = word_list[index+1].lstrip(" ").split(splitter, length+1)[:length]
        print word_list[index+1].lstrip(), right_string
        result += " " + " ".join(right_string)
        search_result.append(result.strip())
        index += 2
    return search_result

def search(file, keyword, length=2, splitter= " "):
    search_results = []
    with open(file, "r") as fo:
        for line in fo:
            line = line.strip()
            search_results += get_word_list(line, keyword, length, splitter)
    for result in search_results:
        print "Result:", result

Upvotes: 0

Avinash Raj
Avinash Raj

Reputation: 174706

Through re.findall function.

>>> s = """List of the keyboard shortcuts for Word 2000
Sequences: strings, lists, and tuples - PythonLearn"""
>>> re.findall(r'\S+ \S+ \S*\blists\S* \S+ \S+', s)
['Sequences: strings, lists, and tuples']

Without regex.

>>> s = """List of the keyboard shortcuts for Word 2000
Sequences: strings, lists, and tuples - PythonLearn"""
>>> for i in s.split('\n'):
        z = i.split()
        for x,y in enumerate(z):
            if 'lists' in y:
                print(z[x-2]+' '+z[x-1]+' '+z[x]+' '+z[x+1]+' '+z[x+2])


Sequences: strings, lists, and tuples

Upvotes: 2

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