CODEWITHSUNDEEP
pythonloopsrange
BubbleMonster
BubbleMonster

Reputation: 1416

Add number between digits in range

I have a range 10-20 and I want to add a 0 in between each digit, so for example:

range(10,15) returns 10, 11, 12, 13, 14

I want it to loop through and return 1000, 1010, 1020, 1030 and 1040.

I tried this:

a = range(10,20)

for i in a: 
    i.append(0)
    print (i)

No luck. Error message says: 

    i.append(0)
AttributeError: 'int' object has no attribute 'append'

What am I doing wrong? Thanks.

Upvotes: 0

Views: 217

Answers (3)

IceArdor
IceArdor

Reputation: 2041

This task can be solved either using strings (the 0's are being implicitly appended here) or by keeping this problem in the integer domain. Build either approach as a function and then use a list comprehension or built-in map to add 0's to every item in your range.

Option 1: convert to string, add 0's, convert back to integer

int(''.join((s+'0' for s in str(13)))

Option 2: stay in integer domain

result = 0
digit = 0
num = 14
while num>1:
    result += 10**(2*digit) * (num % 10)
    num //= 10 # integer division
    digit += 1
return result

By any chance were you looking for range(1000, 1050, 10), which gives the values 1000, 1010, 1020, 1030, 1040?

Upvotes: 1

leeladam
leeladam

Reputation: 1758

As Tim Pietczker mentioned in his comment (which is much more an answer), you don't need to stuck with ranges of one increment. You can simply:

a = range(1000,2000,10)

However, your original code can be fixed like this:

a = range(10,20)

for i in a:
    si=str(i)   # convert your i integer to si string
    newsi=''    # initalize a new empty string
    for letter in si:      # loop through your string of digits
        newsi+=letter      # add the oncoming digit to the new string
        newsi+=0           # add a 0 to the new string
    newi=int(newsi)  # convert your new string to integer
    print newi

Upvotes: 1

Jayanth Koushik
Jayanth Koushik

Reputation: 9904

You are trying to add strings to a number which you can't. You should first convert the number to a string.

[int('0'.join(str(i))+'0') for i in range(10, 20)]

Upvotes: 4

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