Not able to search for a specific sub-string in a given string - PYTHON : str_search = "DD09"
    
    str_1 = "DD09 High speed status"
    Str_2 = "Dd09 High speed status"
    
    str.find (str_search)
    print(str)

Output : DD09 High speed status

Why am not able to print Str_2 ? how to overcome this issue

Python New Bee here 