Удаление текста из строки после запятой

import re
  
regexp = re.compile(',.+')
with open ('text_for_regexp', 'r') as file:
     string = file.read()
print(re.sub(regexp, '', string))

import re 
regexp = re.compile(',.+|\(.+')
with open ('text_for_regexp', 'r') as file:
     string = file.read()
print(re.sub(regexp, '', string))

input = open('medical_profession.lst', 'r')
output = open('medical_profession_edit.lst', 'w')
linesarray = input.readlines()
input.close()
seen = []
for line in linesarray:
    if line not in seen:
        seen.append(line)    
output.writelines(seen)

import re
input = open('medical_profession.lst', 'r')
output = open('medical_profession_edit.lst', 'w')
linesarray = input.readlines()
input.close
seen = []
for line in linesarray:
    if line not in seen:
        line = re.sub(',.+|\(.+', '', line)
        seen.append(line)
output.writelines(seen)
import re

text = ''
input = open("medical_profession.lst", "r", encoding='utf-8')
for line in input.readlines():
    for n in line:
        if n not in ',(':
            text += n
        else:
            output = open("medical_profession_edit.lst", "a",  encoding='utf-8')
            output.write(text+'\n')
            output.close()
            text = ''
            break
input.close()

for i in open('test.lst').readlines():
    print i.split(',')[0].split('(')[0]

# python 3.4
input = open(r'c:\Python34\test.lst', 'r', encoding='utf-8')
for line in input.readlines():
    output = open(r"c:\Python34\test_edit.lst", "a",  encoding='utf-8')
    a = line.split(',')[0].split('(')[0]
    if '\n' not in a: a = a+'\n'
    output.write(a)
output.close()
input.close()