String Substitution - Web DevelopmentYouTube↗  IA↗(long shot)
Education  4.7K views 1 likes 0 dislikes   22 Apr 2012
Udacity 651K subscribers United States YouTube↗


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before we got too much further I want to
Antes de avanzar, quiero explicarte
teach you a quick little Python thing about how to do string substitution
un pequeño truco para la sustitución de cadenas.
this will make generating our HTML a
Esto facilitará la generación del HTML.
little bit more convenient so if we have a string in Python that's represented
Si tenemos una cadena en Python que se representa así,
like this this is a you know a string that we will probably returning
probablemente devuelva algo así en nuestra aplicación web,
something like this in our web app you know a little bit of HTML with some
un poco de HTML con algo de contenido.
contents you know if we want to return a lot of different types of bold contents with with different text it's a pain
Si queremos devolver diferentes contenidos en negrita,
because we have to make this whole
es trabajoso porque debemos repetir cada vez toda la cadena.
string every time so instead we can do
Pero podemos hacer algo así.
something like this okay so here we have the same that the
Esta es la misma estructura de la cadena,
same structure of the string we've still got our you know our B tags for peanut
con las etiquetas <b> para la cadena,
bold but I've replaced the contents with this percent s and what this does is if we follow the string with a percent sign
pero he reemplazado el contenido con %s. Si tras la cadena añadimos el símbolo % y luego una variable,
and then a variable it will substitute the contents of this variable for
sustituirá el contenido de la variable con %s.
percent s so if this were instead you know a and a equaled some bold text when
Si esto fuera a, y a="texto en negrita",
we print this string when we print quote B % SB percent a will actually get output that looks like this and this is
cuando imprimimos esta cadena "<b> %s </b>" % a obtendremos algo así,
how it can generate this string so this
y así se generan las cadenas.
is really convenient cuz we could have a function that just you know substitutes you know one variable into a string and
Es muy práctico, porque una función puede sustituir una variable en una cadena
then we don't have to build that string
y así no tenemos que introducir la cadena todas esas veces.
over and over and over again okay so time for a quick quiz
Ahora un pequeño test.
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