Multi tool use

I need some help starting of this radio program

What I need help on is getting the stations to change to the next station in the list if the user presses 3.

class Radio:
def __init__(self):
self.stations=["STATIC","97.2", "99.6", "101.7", "105.3", "108.5"]
self.stationStart=self.stations[0]
def seekNext(self):
self.stationsStart


It starts at static but I want it to change every single one and then start over again. I tried something like this:

stations=["STATIC","97.2", "99.6", "101.7", "105.3", "108.5"]
a =input("enter 3 to seek next")
while a !="0":
if a =="3":
print(stations[-1])


I only end up getting the last station cannot figure out how to list the rest of the stations.

3 Answers
3

There are a couple of reasonable ways to do what you want.

The easiest would be to make your class store an index into your list, rather than an list item directly. That way you can increment the index and wrap it around using the % modulus operator:

%

class Radio:
def __init__(self):
self.stations=["STATIC","97.2", "99.6", "101.7", "105.3", "108.5"]
self.station_index = 0

def seek(self):
print("Currently tuned to", self.stations[self.station_index])
print("Seeking...")
self.station_index = (self.station_index + 1) % len(self.stations)
print("Now tuned to", self.stations[self.station_index])


A "fancier", and possibly more Pythonic way to solve the problem would be to use the cycle generator from the itertools module in the Python standard library. It returns an iterator that yields the values from your list, starting over when it reaches the end. Though you usually only deal with iterators in for loops, it's easy to use the iterator protocol by hand too. In our case, we just want to call next on the iterator to get the next value:

cycle

itertools

for

next

import itertools

class Radio:
def __init__(self):
self.stations = itertools.cycle(["STATIC","97.2", "99.6", "101.7", "105.3", "108.5"])
self.current_station = next(self.stations)

def seek(self):
print("Currently tuned to", self.current_station)
print("Seeking...")
self.current_station = next(self.stations)
print("Now tuned to", self.current_station)


index = 0

if a=="3":
index = (index+1)%6
print(stations[index])


len(stations)

6

Define a variable in init with the actual position "self.pos = 0", and call this function when you required

def seekNext(self):
if(self.pos == (len(self.stations)-1)):
self.pos = 0
else:
self.pos += 1
print(self.stations[self.pos])


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