Use string formatting and list comprehension:
>>> lst = range(11)
>>> ["{:02d}".format(x) for x in lst]
['00', '01', '02', '03', '04', '05', '06', '07', '08', '09', '10']
or format:
>>> [format(x, '02d') for x in lst]
['00', '01', '02', '03', '04', '05', '06', '07', '08', '09', '10']
Top answer 1 of 6
28
Use string formatting and list comprehension:
>>> lst = range(11)
>>> ["{:02d}".format(x) for x in lst]
['00', '01', '02', '03', '04', '05', '06', '07', '08', '09', '10']
or format:
>>> [format(x, '02d') for x in lst]
['00', '01', '02', '03', '04', '05', '06', '07', '08', '09', '10']
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zfill does exactly what you want and doesn't require you to understand an arcane mini-language as with the various types of string formatting. There's a place for that, but this is a simple job with a ready-made built-in tool.
ranger = [str(x).zfill(2) for x in range(r)]
GeeksforGeeks
geeksforgeeks.org › python-convert-string-ranges-to-list
Python | Convert String ranges to list | GeeksforGeeks
May 16, 2023 - ... # Python3 code to demonstrate working of # Convert String ranges to list # Using sum() + list comprehension + enumerate() + split() # initializing string test_str = "1, 4-6, 8-10, 11" # printing original string print("The ...
loops - Generating a range of numbers as strings Python - Stack Overflow
I need to loop over a number of files with structured files names. They are of the form 'Mar00.sav', 'Sep00.sav', 'Mar01.sav' At the moment I do this; Years = ['01', '02', '03', '04', '05', '06'... More on stackoverflow.com
How to convert numeric string ranges to a list in Python - Stack Overflow
I would like to be able to convert a string such as "1,2,5-7,10" to a python list such as [1,2,5,6,7,10]. I looked around and found this, but I was wondering if there is a clean and simple way to d... More on stackoverflow.com
python - Create a list with string + range - Stack Overflow
Bring the best of human thought and AI automation together at your work. Explore Stack Internal ... I want to create a list looking like this ['Unnamed: 16', 'Unnamed: 17', 'Unnamed:18'] for a range (16,60). How can I proceed? I don't know if my question is clear but it's like doing list(range(16, 60) but with a string ... More on stackoverflow.com
python - How to transfer range() output into string - Stack Overflow
How to create a list of string using range() built-in function in python? More on stackoverflow.com
EyeHunts
tutorial.eyehunts.com › home › python range to the list of strings | example code
Python range to the list of strings | Example code - EyeHunts
August 27, 2021 - They are of the form ‘Mar00.sav’, ‘Sep00.sav’, ‘Mar01.sav’ · Python simple example code. There is a perfect solution to it -zfill method. Generator for N numbers and fill its string representation with zeros. list1 = [] for i in range(1, 7): list1.append(str(i).zfill(2)) print(list1) Output: lst = range(11) print(["{:02d}".format(x) for x in lst]) Output: [’00’, ’01’, ’02’, ’03’, ’04’, ’05’, ’06’, ’07’, ’08’, ’09’, ’10’] or format: lst = range(11) print([format(x, '02d') for x in lst]) Output: [’00’, ’01’, ’02’, ’03’, ’04’, ’05’, ’06’, ’07’, ’08’, ’09’, ’10’] sr = [] for r in range(11): sr.append('i' % r) print(sr) Do comment if you have any doubts and suggestions on this Python list topic.
Python Examples
pythonexamples.org › python-convert-numeric-string-range-to-a-list
How to Convert Numeric String Range to a List in Python?
To convert numeric string range like '4-9' to a list like [4, 5, 6, 7, 8, 9] in Python: split the string using hyphen as delimiter, convert the splits to integers, create a range using these integers, and then convert the range to a list.
YouTube
youtube.com › watch
python range to string list - YouTube
Download this code from https://codegive.com In Python, the range function is commonly used to generate a sequence of numbers. While range itself returns a r...
Published February 2, 2024
Stanford CS
cs.stanford.edu › people › nick › py › python-range.html
Python range() Function
The difference is the "step" amount ... before, the stop number itself is always omitted. >>> list(range(0, 10, 2)) [0, 2, 4, 6, 8] >>> list(range(0, 10, 6)) [0, 6] >>> list(range(200, 800, 100)) [200, 300, 400, 500, 600, 700]...
Spark By {Examples}
sparkbyexamples.com › home › python › convert range to list in python
Convert Range to List in Python - Spark By {Examples}
May 31, 2024 - How to convert the range of values to a list in Python? There are multiple ways to convert the range to a list in Python for example you can use the
Top answer 1 of 4
23
I had the same issue and there is a perfect solution to it -zfill method
An example of usage:
>>> str('1').zfill(7)
'0000001'
What you need to do is to create a generator for N numbers and fill its string representation with zeros.
>>> for i in range(1, 18):
... str(i).zfill(2)
...
'01'
'02'
'03'
...
'16'
'17'
2 of 4
8
>>> [str(i).zfill(2) for i in range(1,18)]
['01', '02', '03', '04', '05', '06', '07', '08', '09', '10', '11', '12', '13', '14', '15', '16', '17']
Top answer 1 of 8
40
def f(x):
result = []
for part in x.split(','):
if '-' in part:
a, b = part.split('-')
a, b = int(a), int(b)
result.extend(range(a, b + 1))
else:
a = int(part)
result.append(a)
return result
>>> f('1,2,5-7,10')
[1, 2, 5, 6, 7, 10]
2 of 8
7
I was able to make a true comprehension on that question:
>>> def f(s):
return sum(((list(range(*[int(j) + k for k,j in enumerate(i.split('-'))]))
if '-' in i else [int(i)]) for i in s.split(',')), [])
>>> f('1,2,5-7,10')
[1, 2, 5, 6, 7, 10]
>>> f('1,3-7,10,11-15')
[1, 3, 4, 5, 6, 7, 10, 11, 12, 13, 14, 15]
the other answer that pretended to have a comprehension was just a for loop because the final list was discarded. :)
For python 2 you can even remove the call to list!
Top answer 1 of 5
4
You can use f-strings to do so :
my_list = [f"Unnamed: {i}" for i in range(16, 60)]
# Output
['Unnamed: 16', 'Unnamed: 17', 'Unnamed: 18', 'Unnamed: 19', ...]
2 of 5
0
I would do it following way
prefix = "Unnamed: "
lst = [prefix + str(i) for i in range(16,25)]
print(lst)
output
['Unnamed: 16', 'Unnamed: 17', 'Unnamed: 18', 'Unnamed: 19', 'Unnamed: 20', 'Unnamed: 21', 'Unnamed: 22', 'Unnamed: 23', 'Unnamed: 24']
Note: I used othre range for brevity sake. You might elect to use one of string formatting method instead.
TutorialKart
tutorialkart.com › python › python-range › python-range-to-list
Convert Python Range to List - Examples
November 30, 2020 - To convert a Python Range to Python List, use list() constructor, with range object passed as argument. list() constructor returns a list generated using the range. Or you can use a for loop to append each item of range to list.
University at Buffalo
math.buffalo.edu › ~badzioch › MTH337 › PT › PT-lists.html
Lists, ranges and “for” loops — MTH 337
The iteration variable letter gets bound to each string character in turn: for letter in 'hello': if letter != 'l': print(letter) ... As the examples above illustrate in many situations we may need to iterate a for loop over a sequence of consecutive integers. It would be inconvenient having to manually type a list of integers to code such iteration. Instead we can use the range function that generates integers in a given range.
Stack Overflow
stackoverflow.com › questions › 68491454 › using-range-function-in-python
loops - Using range function in Python - Stack Overflow
Every string in Python ist iterable, so don't use another generator like range. But if your string is "a b c d e f g", every second element is a space " ". Here you'd use for i in "a b c d e f g".split(" ") ;) (and concatenate in a new variable as Barmar said) ... Your example doesn't work, because i = i.upper() does not reassign the uppercase letter back to the original string.
Python Examples
pythonexamples.org › python-convert-range-into-a-list
Convert Range into a List
In the following example, we take a range object starting at 4, and progressing upto 10 (excluding 10), and convert this range object into a list. # Take a range myrange = range(4, 10) # Convert range object into a list mylist = list(myrange) print(mylist) ... In the following example, we take ...
GeeksforGeeks
geeksforgeeks.org › python › python-construct-n-range-equilength-string-list
Python | Construct N Range Equilength String list - GeeksforGeeks
May 17, 2023 - Number of elements required : 6 K Length range strings list : ['000', '001', '002', '003', '004', '005'] Time Complexity: O(n), where n is the length of the list test_list Auxiliary Space: O(n) additional space of size n is created where n is the number of elements in the res list · Method #3: Using List Comprehension + format method ... # Python3 code to demonstrate working of # Construct N Range Equilength String list # using format method # initialize N N = 6 # printing N print("Number of elements required : " + str(N)) # initialize K K = 3 res = ['{:0{}}'.format(i, K) for i in range(N)] # printing result print("K Length range strings list : " + str(res)) #this code is contributed by edula vinay kumar reddy
Reddit
reddit.com › r/learnpython › not really understanding when to use for i in string vs for i in range(len(string))
r/learnpython on Reddit: Not really understanding when to use for I in string vs for I in range(len(string))
September 27, 2020 -
Just looking for clarification for this very simple thing. Please correct me if I’m wrong but from what I understand, in for i in string, it takes each element in the string over the entire length. For i in range(len(string)) it indexes the elements and looks at the elements at each index so at position 0, string =‘x’ and at 1 string= ‘d’ ect.
If this is correct, I’m afraid I still don’t see the difference by way of when to use each or what purpose they serve.
Top answer 1 of 5
14
For strings, there is basically zero reason to use the latter. If you need access to the index, use enumerate. For lists, you use the latter when you are changing the list that you're iterating over.
2 of 5
6
Let's do this with code, since your words aren't particularly clear without reference to some specific examples: s = 'abcdefg' for character in s: print(character) for i in range(len(s)): character = s[i] print(character) Both loops above produce the same printed output (each character of the string 's' on its own line). The first loop iterates over the characters of 's' directly; there is no indexing used. The second loop iterates over a sequence of indices (created by the range() iterable), and uses those indices to look up the character. Now, do you have any specific question(s) about the above two examples, and how they differ? The first loop is a newer form of looping that didn't exist in the original Python 1, but is now preferred for this particular usage. The second form has existed for longer, and still works, just requires the extra effort of indexing.
GeeksforGeeks
geeksforgeeks.org › range-to-a-list-in-python
range() to a list in Python - GeeksforGeeks
April 17, 2025 - List comprehension provides another efficient and Pythonic way to convert a range object into a list. ... The comprehension iterates through each element in the range object. Each element is added to the new list, resulting in the complete conversion. The unpacking operator * can unpack the elements of a range object directly into a list.