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def aparece_solo_una_vez(cadena, busqueda): | |
indice_primera_ocurrencia = cadena.index(busqueda) | |
indice_ultima_ocurrencia = cadena.rindex(busqueda) | |
if indice_primera_ocurrencia == indice_ultima_ocurrencia: | |
return True | |
else: | |
return False | |
print(aparece_solo_una_vez("Luis", "L")) # True | |
print(aparece_solo_una_vez("programación python desde parzibyte.me", "p")) # False | |
print(aparece_solo_una_vez("aloha", "a")) # False | |
print(aparece_solo_una_vez("Me gusta programar", "programar")) # True | |
print(aparece_solo_una_vez( | |
"Me gusta programar porque programar es interesante", "programar")) # False |
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