cheatsheet2

  

Cheat-sheet (Data Types)

In this section, you learned that:

• Integers are for representing whole numbers:

rank = 10
eggs = 12
people = 3

• Floats represent continuous values:

temperature = 10.2
rainfall = 5.98
elevation = 1031.88

• Strings represent any text:

message = "Welcome to our online shop!"
name = "John"
serial = "R001991981SW"

• Lists represent arrays of values that may change during the course of the program:

members = ["Sim Soony", "Marry Roundknee", "Jack Corridor"]
pixel_values = [252, 251, 251, 253, 250, 248, 247]

• Dictionaries represent pairs of keys and values:

phone_numbers = {"John Smith": "+37682929928", "Marry Simpons": "+423998200919"}
volcano_elevations = {"Glacier Peak": 3213.9, "Rainer": 4392.1}

• Keys of a dictionary can be extracted with:

phone_numbers.keys()

• Values of a dictionary can be extracted with:

phone_numbers.values()

• Tuples represent arrays of values that are not to be changed during the course of the program:

vowels = ('a', 'e', 'i', 'o', 'u')
one_digits = (0, 1, 2, 3, 4, 5, 6, 7, 8, 9)

• To find out what attributes a type has:

dir(str)
dir(list)
dir(dict)

• To find out what Python builtin functions there are:

dir(__builtins__)

• Documentation for a Python command can be found with:

help(str)
help(str.replace)
help(dict.values)

PYTHON PROGRAM SYNTAX SERIES