common substring is now a feature

main.py

 import pandas as pd
 from util import get_postimees_urls, get_text
-from preprocessing import get_verbs_gf
+from preprocessing import get_preprocessed_verbs
 
 import progressbar
 import numpy as np
 from tqdm import tqdm
 
 print("getting verbs...")
-verbs = get_verbs_gf()
+
+verbs = get_preprocessed_verbs()
 print(verbs)
-retrieve liks to postimees articles
+# retrieve liks to postimees articles
 print("getting postimees urls...")
 postimees_urls = get_postimees_urls()
 

preprocessing.py

 import pandas as pd
 import numpy as np
+from difflib import SequenceMatcher
 
-def get_verbs_gf():
-	# read file as dataframe
-	df = read_csv()
-	df = split_double(df)
-	return df
+def get_preprocessed_verbs():
+	return read_csv("preprocessed_verbs.csv", ",")
+
+def preprocess_verbs():
+	df = read_csv("verbs_gf.csv", ", ")
+	df = split_double_forms(df)
+	df = add_common_substring(df)
+	save_csv(df)
 
-def read_csv():
-	df = pd.read_csv("verbs_gf.csv", sep=", ", encoding='utf8', header=None, engine='python')
+def read_csv(path, sep):
+	df = pd.read_csv(path, sep=sep, encoding='utf8', header=None, engine='python')
 	return df
 
-def split_double(df):
+def save_csv(df):
+	df.to_csv("preprocessed_verbs.csv", index=False)
+
+def split_double_forms(df):
 	for i in range(len(df.index)):
 		row = df.iloc[i]
 		split_row = row.str.split('|', expand=True)
@@ -21,4 +28,22 @@ def split_double(df):
 			df = df.append(second_form, ignore_index=True)
 		except Exception as e:
 			pass
-	return df
\ No newline at end of file
+	return df
+
+def add_common_substring(df):
+	df["common_substring"] = ''
+	for row in range(df.shape[0]):
+		for column in range(df.shape[1]-2):
+			verb1 = df[column][row]
+			verb2 = df[column+1][row]
+			current_common = find_common_substring(verb1, verb1)
+			if df["common_substring"][row] == '':
+				df["common_substring"][row] = current_common
+			elif current_common != df["common_substring"][row]:
+				df["common_substring"][row] = find_common_substring(current_common, df["common_substring"][row])
+	print(df)
+	return df
+
+def find_common_substring(string1, string2):
+	match = SequenceMatcher(None, string1, string2).find_longest_match(0, len(string1), 0, len(string2))
+	return string1[match.a : match.size]
\ No newline at end of file