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 keyb
Solution 1:
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
Solution 2:
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
insidefor
, 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]))
Solution 3:
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
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