Network visualisation code

edge_list.py

import csv
import wikipedia
import urllib.request
from bs4 import BeautifulSoup as BS
import re

# get a list of programming languages from Wikipedia
pageTitle = "List of programming languages"
nodes = list(wikipedia.page(pageTitle).links)
print(nodes)

# remove unwanted links
removeList = ["List of","Lists of","Timeline","Comparison of","History of","Esoteric programming language"]
nodes = [i for i in nodes if not any(r in i for r in removeList)]

# define some functions
base = "https://en.wikipedia.org/wiki/"

# get HTML
def getSoup(n):
    try:
        with urllib.request.urlopen(base+n) as response:
            soup = BS(response.read(),'html.parser')
        table = soup.find_all("table",class_="infobox vevent")[0]
        return table
    except:
        pass

# get some metadata
def getYear(t):
    try:
        t = t.get_text()
        year = t[t.find("appear"):t.find("appear")+30]
        year = re.match(r'.*([1-3][0-9]{3})',year).group(1)
        return int(year)
    except:
        return "Could not determine :("

# function to find the links for a given language
def getLinks(t):
    try:
        table_rows = t.find_all("tr")
        for i in range(0,len(table_rows)-1):
            try:
                if table_rows[i].get_text() == "\nInfluenced\n":
                    out = []
                    for j in table_rows[i+1].find_all("a"):
                        try:
                            out.append(j['title'])
                        except:
                            continue
                    return out
            except:
                continue
        return
    except:
        return
      
# create list objects to store data
edgeList = [["Source,Target"]]
meta = [["Id","Year"]]

# go through each node, use functions defined earlier to collect data and append to lists
for n in nodes:
    try:
        temp = getSoup(n)
    except:
        continue
    try:
        influenced = getLinks(temp)
        for link in influenced:
            if link in nodes:
                edgeList.append([n+","+link])
                print([n+","+link])
    except:
        continue
    
    year = getYear(temp)
    meta.append([n,year])

# finally - write CSV files to import into Gephi
with open("edge_list.csv","w") as f:
    wr = csv.writer(f)
    for e in edgeList:
        wr.writerow(e)
        
with open("metadata.csv","w") as f2:
    wr = csv.writer(f2)
    for m in meta:
        wr.writerow(m)

"year=re.match(r'.([1-3][0-9]{3})',year).group(1)" "year=re.match(r'.([1-3][0-9]{3})',year)" return "none";
"year=re.match(r'(/d{4})',year)" returns "none"; this is a result from the method of 'match';
but ".*" maybe not work；

so， “year=re.findall(r'(\d{4})'，year)” return "['1987']"
“year=re.findall(r'(\d{4})', year).group(1)” return "'list' object has no attribute 'group'"

In summary，these makes me wonder. Wish you can give me some guidances.