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Grundlæggende Operatører
This section explains how to use basic operators in Python.
Aritmetiske Operatorer
Ligesom i andre programmeringssprog kan additions-, subtraktions-, multiplikations- og divisionsoperatorerne bruges med tal.
number = 1 + 2 * 3 / 4.0
print(number)
Prøv at forudsige, hvad svaret vil være. Følger Python rækkefølgen af operationer?
En anden tilgængelig operator er modulo (%) operatoren, som returnerer heltalsresten af divisionen. dividende % divisor = rest.
remainder = 11 % 3
print(remainder)
Ved at bruge to multiplikationssymboler dannes et potensforhold.
squared = 7 ** 2
cubed = 2 ** 3
print(squared)
print(cubed)
Brug af Operatorer med Strenge
Python understøtter sammenkædning af strenge ved brug af additionsoperatoren:
helloworld = "hello" + " " + "world"
print(helloworld)
Python understøtter også multiplikation af strenge for at danne en streng med en gentagende sekvens:
lotsofhellos = "hello" * 10
print(lotsofhellos)
Brug af Operatorer med Lister
Lister kan sammenføjes med additionsoperatoren:
even_numbers = [2,4,6,8]
odd_numbers = [1,3,5,7]
all_numbers = odd_numbers + even_numbers
print(all_numbers)
Ligesom med strenge understøtter Python at danne nye lister med en gentagende sekvens ved brug af multiplikationsoperatoren:
print([1,2,3] * 3)
Øvelse
Målet med denne øvelse er at oprette to lister kaldet x_list og y_list, som indeholder 10 forekomster af variablerne x og y, henholdsvis. Du skal også oprette en liste kaldet big_list, som indeholder variablerne x og y, 10 gange hver, ved at sammenkæde de to lister, du har oprettet.
x = object()
y = object()
# TODO: change this code
x_list = [x]
y_list = [y]
big_list = []
print("x_list contains %d objects" % len(x_list))
print("y_list contains %d objects" % len(y_list))
print("big_list contains %d objects" % len(big_list))
# testing code
if x_list.count(x) == 10 and y_list.count(y) == 10:
print("Almost there...")
if big_list.count(x) == 10 and big_list.count(y) == 10:
print("Great!")
x = object()
y = object()
# TODO: change this code
x_list = [x] * 10
y_list = [y] * 10
big_list = x_list + y_list
print("x_list contains %d objects" % len(x_list))
print("y_list contains %d objects" % len(y_list))
print("big_list contains %d objects" % len(big_list))
# testing code
if x_list.count(x) == 10 and y_list.count(y) == 10:
print("Almost there...")
if big_list.count(x) == 10 and big_list.count(y) == 10:
print("Great!")
Ex().check_object('x_list').has_equal_value(expr_code = 'len(x_list)')
Ex().check_object('y_list').has_equal_value(expr_code = 'len(y_list)')
Ex().check_object('big_list').has_equal_value(expr_code = 'len(big_list)')
success_msg('Good work!')
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