TypeError: 'in <string>' requires string as left operand, no

nodelist = ["1.1.1.1", "2.2.2.2"]

def checkactivenode(file_name, ip_to_search):
  with open(file_name, 'r') as read_obj:
    for list in read_obj:
      if ip_to_search in list:
        return True
  return False

after executing: checkactivenode(filename, nodelist)

Error:
Traceback (most recent call last):
  File "main.py", line 42, in <module>
    checkactivenode(pwlcfullpath, nodelist)
  File "main.py", line 33, in checkactivenode
    if ip_to_search in list:
TypeError: 'in <string>' requires string as left operand, not list