python code to reverse an array without using the function

Question

My task is to create an empty array and take the input from the user, but I have to print the input element in a reversed order without the function, that too in an array itself.

x=int(input('how many cars do you have'))
a=[]
for i in range(x):
    car=(input('enter your car name'))
    a.append(car)
    
    print(a)
y=[]
for i in range(length(a)-1,-1,-1):
    y.append(a[i])
    
    print (y)

Why am i getting repeated reverse array output with this code. Can anyone please tell me what's wrong in this

HiEd's answer is correct. Your print (y) is indented, meaning it's in the if statement, meaning with every iteration it prints y. So just remove the indentation/four spaces in front of print (y). — Tõnis Piip
– Tõnis Piip, Commented Jul 28, 2021 at 9:45

user426 · Accepted Answer · 2021-07-28 05:49:18Z

1

Use slicing on any sequence to reverse it :

print(list[::-1])

answered Jul 28, 2021 at 5:49

user426

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Comments

Darkknight · Accepted Answer · 2022-01-01 05:01:33Z

1

If your looking for a method from scratch without using any built-in function this one would do

arr = [1,2,3,5,6,8]
for i in range(len(arr)-1):
  arr.append(arr[-2-i])
  del(arr[-3-i])
print(arr)
# [8, 6, 5, 3, 2, 1]

answered Jan 1, 2022 at 5:01

Darkknight

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Comments

Muhammad Rizwan · Accepted Answer · 2021-07-28 05:49:35Z

0

you should use slicing. for example,

a = ['1','2','3']
print(a[::-1])

will print ['3','2','1']. I hope this will work for you.

Happy Learning!

answered Jul 28, 2021 at 5:49

Muhammad Rizwan

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HiEd · Accepted Answer · 2021-07-31 05:11:29Z

0

Your code is giving me the correct output except that len() is used to calculate the length of a list and not length().

x=int(input('how many cars do you have')) 
a=[] 
for i in range(x): 
    car=(input('enter your car name')) 
    a.append(car)
print(a)
y=[] 
for i in range(len(a)-1,-1,-1): 
    y.append(a[i])
print(y)

edited Jul 31, 2021 at 5:11

answered Jul 28, 2021 at 5:50

HiEd

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2 Comments

fathima abdulla Over a year ago

how many cars do you have3 enter your car nameswift ['swift'] enter your car namebaleno ['swift', 'baleno'] enter your car namebolero ['swift', 'baleno', 'bolero'] ['bolero'] ['bolero', 'baleno'] ['bolero', 'baleno', 'swift'].... i am talking about the third last and second last line.... is it possible to get just the last line.

HiEd Over a year ago

I have added a screenshot of the output in my answer. I just get ['bolero', 'baleno', 'swift'] as the output.

yogender · Accepted Answer · 2022-01-25 09:59:19Z

0

Simple Custom way (without using built-in functions) to reverse a list:

def rev_list(mylist):
    max_index = len(mylist) - 1
    return [ mylist[max_index - index] for index in range(len(mylist)) ]
rev_list([1,2,3,4,5])

#Outputs: [5,4,3,2,1]

answered Jan 25, 2022 at 9:59

yogender

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