Does String Contain String

in

if "c" in "abcdef":     
  #Character found

if "cde" in "abcdef":     
  #String found

if my_string.find("abc") >= 0:    #find() returns index or -1 if not found
  #String found

Does string start with

if my_string.find("abc") == 0:    #find() returns index or -1 if not found
  #Starts with string

Does string end with

if my_string.endswith("abc"):
  #Ends with string