Added python file to demerge large pdfs to smaller ones of required sizes

Author: Darpan-Balar

Diff for: PDF/demerge_pdfs.py

@@ -0,0 +1,43 @@
+"""
+Python program to split large pdf(typically textbook) into small set of pdfs, maybe chapterwise
+to enhance the experience of reading and feasibility to study only specific parts from the large original textbook
+"""
+
+
+import PyPDF2
+path = input()
+merged_pdf = open(path, mode='rb')
+
+
+pdf = PyPDF2.PdfFileReader(merged_pdf)
+
+(u, ctr, x) = tuple([0]*3)
+for i in range(1, pdf.numPages+1):
+
+    if u >= pdf.numPages:
+        print("Successfully done!")
+        exit(0)
+    name = input("Enter the name of the pdf: ")
+    ctr = int(input(f"Enter the number of pages for {name}: "))
+    u += ctr
+    if u > pdf.numPages:
+        print('Limit exceeded! ')
+        break
+
+    base_path = '/Users/darpan/Desktop/{}.pdf'
+    path = base_path.format(name)
+    f = open(path, mode='wb')
+    pdf_writer = PyPDF2.PdfFileWriter()
+
+    for j in range(x, x+ctr):
+        page = pdf.getPage(j)
+        pdf_writer.addPage(page)
+
+    x += ctr
+
+    pdf_writer.write(f)
+    f.close()
+
+
+merged_pdf.close()
+print("Successfully done!")