how to check if argument is passed in python code example

Example 1: javascript check if argument is passed

function func(arg1, arg2) {
  if (typeof arg2 === "undefined") {
    arg2 = "defaultValue";
  }
  
  //Rest of function
}

Example 2: python check if value in string

def is_value_in_string(value: str, the_string: str):
    return value in the_string.lower()