Code gives no output, can someone help?

Question

import random
tw=input()
way1=["Left", "Right"]
way2=["Left", "Right"]
way3=["Left", "Right"]
random.shuffle(way1)
random.shuffle(way2)
random.shuffle(way3)
if tw=="Boston" or tw=="Washington":
if tw=="Boston" and way1=="Left":
print("Train is allowed to proceed through")
break
elif tw=="Boston" and way1=="Right":
print("1st way, Switch switcher to the left")
print("Train is allowed to proceed through")
break
elif tw=="Washington" and way1=="Right":
print("Train is allowed to proceed through")
break
elif tw=="Washington" and way1=="Left":
print("1st way, Switch switcher to the right")
print("Train is allowed to proceed through")
break
Can't understand why programm gives no output, can someone help me understand what is my mistake?
Also, thanks

Answer 1

Anthony Instead of copying and pasting the code, use Code Playground to share it. Just edit your question description and add a link to your code, using "+" button.
This allows people to run and debug your code, and avoid copy errors.

Answer 2

Anthony break statement is used to stop the execution of loop when needed and is placed inside the loop

another thing
way1, way2, way3 are list
so you can't compare them like
way1 == "Left"
it's always false

instead use
way1[0] == "Left"

Answer 3

Anthony
There is no need for the breaks. Its an if-elif not a switch case.

way1, way2, way3 are lists. after shuffling, if you want to get an item, you have to specify an index.

Try this:

import random
tw=input()
way1=["Left", "Right"]
way2=["Left", "Right"]
way3=["Left", "Right"]
random.shuffle(way1)
random.shuffle(way2)
random.shuffle(way3)
if tw=="Boston" or tw=="Washington":
if tw=="Boston" and way1[0]=="Left":
print("Train is allowed to proceed through")
elif tw=="Boston" and way1[0]=="Right":
print("1st way, Switch switcher to the left")
print("Train is allowed to proceed through")
elif tw=="Washington" and way1[0]=="Right":
print("Train is allowed to proceed through")
elif tw=="Washington" and way1[0]=="Left":
print("1st way, Switch switcher to the right")
print("Train is allowed to proceed through")

Answer 4

Thank you

Answer 5

Bob_Li nice one 👏,
look he didn't use way2, way3, random.shuffle(way2) etc.. It's over code.
A several repeats words in each string, so you can make var with that and use it. Don't repeat yourself.

Answer 6

Smith Welder
probably more code left out.
good idea on using variables for repeated messages.

But I'm wondering if this is the best way to handle this?

There's going to be a ton of branching possibilities that needs to be hardcoded...

I would consider using a function to handle the branching decisions, and maybe dictionary for outcomes and actions.

or OOP if the condtions are convoluted.
Train switching is a graph structure.

Answer 7

Bob_Li
My friend, of course, better way is save logic but make better algorithm. So as i told that make var and don't use way2.. 3 , a lots of if else etc..
So this code may looks like this:

from random import randint
w=["Left", "Right"]
r1=randint(0,1);r2=randint(0,1)
tr = "Train is allowed to proceed through"
ns = "1st way, Switch switcher to the "
def show(b,c=False):
print (tr if c else ns+w[b]+"\n"+tr if b else ns+w[0]+"\n"+tr)
show(r1,r2)