有没有办法在 ptyhon 中的粗体文本之后提取句子？

Question

so i have extracted some bold text from a pdf in python. Which works fine. but i want to extract also the sentence, or more then one sentence after the bold text, eg " Blue sky is what we see when we look up"

I can extract the blue sky part. But I'm not able to extract the "is what we see when we look up" part.

import pdfplumber 

with pdfplumber.open('C:/Users/somefile.pdf') as pdf: 
    for i in range(12, 15):
        text = pdf.pages[i]
        clean_text = text.filter(lambda obj: obj["object_type"] == "char" and "Bold" in obj["fontname"])
        print(clean_text.extract_text())

Answer 1

pdfplumber returns a Python string as a result of filtering the page content by given formatting criteria like finding all of the bold text in the page.

Notice, that all the bold text will be returned, not only the first found section. This is the reason I have in the following code limited the size of the found string to a size you are sure to be able to find in the page text as continuous text.

With .extract_text() you can get the text of the entire page as a Python string and this way you have two Python strings to use in accomplishing what you are after. To give an example of how-to I have chosen in the code below the dot . as delimiter in order to extract the entire sentence " Blue sky is what we see when we look up."

Using the code below you should be able to extract that sentence:

import pdfplumber 
with pdfplumber.open(str_pdf_file, password='') as pdf:
    first_page = pdf.pages[0]
    first_page_entire_text = first_page.extract_text()
    first_page_bold_text   = first_page.filter(lambda obj: obj["object_type"] == "char" and "Bold" in obj["fontname"]).extract_text()
    indx_bold = first_page_entire_text.find(first_page_bold_text[0:8])
    indx_dot  = first_page_entire_text[indx_bold:].find('.')
    sentence_starting_with_bold = first_page_entire_text[indx_bold: indx_bold + indx_dot + 1]
    print(sentence_starting_with_bold)