Aprende A Programar Pyhton

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 Aprendiendo A Programar Python

Characters & Functions

# > Deshabilita cualquier función, y sirve para especificar que hace el código.

Print > Imprime lo que quieras que diga entre “” 

%d  > Poner variables en un string

", > Para poner espacio y después una variable

\n > Para poner el resultado de un nuevo renglón (escape double-quotes)

raw_input() >  is a way to Read a String from a Standard input device like a keyboard. 

Import > This is how you add features to your script from the Python feature set. Rather than give you all the features at once

argv > is the “argument variable,” introduce una variable (Input) nueva que puedes usar muchas veces. 

Text.Read > Read a archive

Text > Archive name

sys > is a package

“w+” > Open a program in write mode

“r+” > Read a program

“a+” > Append a program


+ plus

- minus

/ slash

* asterisk

% percent

< less-than

> greater-than

<= less-than-equal

>= greater-than-equal


Variables: In programming, a variable is nothing more than a name for something so you can use the name rather than the something as you code.


cars = 100

space_in_a_car = 4.0

drivers = 30

passengers = 90

cars_not_driven = cars - drivers

cars_driven = drivers

carpool_capacity = cars_driven * space_in_a_car average_passengers_per_car = passengers / cars_driven


How can I print without spaces between words in print?

You do it like this: print "Hey %s there." % "you". You will do more of this soon.


-9 print "Let's talk about %s." % my_name

-10 print "He's %d inches tall." % my_height

-11 print "He's %d pounds heavy." % my_weight


*Donde va el % de dentro del string va lo que pones afuera


Modules: “features” here (these little things you import to make your Python program do more) but nobody else calls them features.


Command, Functions, Methods: You give a file a command by using the . (dot or period), the name of the command, and parameters. 

• close—Closes the file. Like File->Save.. in your editor.

• read—Reads the contents of the file. You can assign the result to a variable.

• readline—Reads just one line of a text file.

• truncate—Empties the file. Watch out if you care about the file.

• write(stuff)—Writes stuff to the file


Exists> This returns True if a file exists, based on its name in a string as an argument


Functions (def) Then we end this line with a : colon and start indenting. 

1. They name pieces of code the way variables name strings and numbers.

2. They take arguments the way your scripts take argv.

3. Using #1 and #2, they let you make your own “mini-scripts” or “tiny commands.”

4. This means you can make your own commands and use them in your scripts too.


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