使用Python如何实现按行合并两个txt文件

file1 = open("my.txt","r")
file2 = open("ids.txt","r")
 
file1_lists =file1.readlines()
file2_lists =file2.readlines()
 
file3_list = []
file4_list = []
for i in file1_lists:
  temp_list = i.split()
  file3_list.append(str(temp_list[0]))
# print(len(file3_list))
 
for i in file2_lists:
  temp_list = i.split()
  file4_list.append(str(temp_list[0]))
# print(len(file4_list))
main_file = []
 
for i in range(len(file3_list)):
  s=""
  s = "".join([file3_list[i],file4_list[i]])
  s+="\n"
  main_file.append(s)
file3 = open("three.txt","w")
file3.writelines(main_file)