replacing string integer in list, python

Question

I wanted to replace string with an integer so I first tried this

timeupseats=[0,480,480,0]
for n in range(0,4): 
   if timeupseats[n]==0:
       timeupseats[n]='CLOSED'
for n in range(0,4): 
   if timeupseats[n]=='CLOSED':
       timeupseats[n]==0

Because the first code didn't work, I tried this code for the second time and it worked

timeupseats=[0,480,480,0]
for n in range(0,4): #print closed when there is no ticket left
    if timeupseats[n]==0:
        timeupseats[n]='CLOSED'
timeupseats = [0 if i=='CLOSED' else i for i in timeupseats]

What's the difference between the first code and the second code? Why did only the second code work?

Davinder Singh · Accepted Answer · 2021-03-20 21:13:34Z

1

In your first set of code you have this error on the last line : timeupseats[n]==0

You want to set it to 0 (=) not check for equality (==)

edited Mar 20, 2021 at 21:13

Davinder Singh

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answered Mar 20, 2021 at 17:49

TheTeaPartyFan

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Comments

AlexNe · Accepted Answer · 2021-03-20 18:05:35Z

0

There are many ways to to this. The in my opinion the most robust one would be to first define the values you want to replace, then apply that on each element of the list with ‘map’:

# make some data
ls = list(range(10))
# define values to replace
mapping = {0: 'CLOSED'}
# do replacement 
ls = list(map(lambda x: mapping.get(x, x), ls))
print(ls)

There is also the more explicit, but more difficult to maintain way:

ls = list(range(10))
for i, x in enumerate(ls):
    if x == 0:
        ls[i] = 'CLOSED'

print(ls)

edited Mar 20, 2021 at 18:05

answered Mar 20, 2021 at 17:51

AlexNe

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5 Comments

Davinder Singh Over a year ago

User all ready created ls which is equal to ['CLOSED', 480, 480, 'CLOSED'] for input [0,480,480,0] , but user is try to get back initial stage

AlexNe Over a year ago

Then just edit the mapping :). I let you figure it out and edit my answer in about 30min.

Davinder Singh Over a year ago

In questioner last line of code snippet timeupseats[n]==0 instead of comparison, it should be assign

Davinder Singh Over a year ago

Create a extra logic for that input ls to get back to initial stage

Davinder Singh Over a year ago

Everything is okk with your both logic :)

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