如何在不使用拆分功能的情况下将字符串转换为列表

Question

I am going to convert: sample_date = "23-05-2000" into a list, with while loop.

example:

"23-05-2000" -> [23, 05, 2000]

Answer 1

import re

s = "23-05-2000"

y = re.sub("-", ", ", s)

z = [] 

z.append(y)

print(z)

output

['23, 05, 2000']

Answer 2

Try the below code using while loop

count = 0
a = "23-05-2000"
e = []
c = ""
while(count != len(a)):
    if a[count]=="-":
         e.append(int(c))
         c = ""
    else:
         c += a[count]
    count+=1
 e.append(int(c))
 #e will have the output you want

Answer 3

You can use the datetime module for this:

from datetime import datetime

date_string = "23-05-2000"
date_format = "%d-%m-%Y" # zero-padded day, zero-padded month, year with century

dt = datetime.strptime(date_string, date_format)
dt_list = [dt.day, dt.month, dt.year]

print(dt_list)

[23, 5, 2000]

Answer 4

If you have to use a while loop

sample_date = "23-05-2000"
part = ''
l = []
while sample_date:
    head = sample_date[0]
    sample_date = sample_date[1:]
    if head == '-':      
        l.append(int(part))
        part = ''
    else:
        part += head
l.append(int(part))

print(l)

Output

[23, 5, 2000]

Answer 5

You could use partition() to do something with each token of the input:

input = '23-05-2000'
output = []
while input:
   token, _, input = input.partition('-')
   do_something_with(token)
   output.append(int(token))

# assert(output == [23, 5, 2000])

Answer 6

because we cant use .split() , we had a few approaches.

How to split a string without using the .split()

### using a while ###

# Creating variables

input_string = "10-20-30-40-50"
split_character = '-'

run = True
result = []
memory = ''
index = 0
string_size = len(input_string) # here we will discovery the size of the string

### The While cycle
# 1º try - we will run all characters of the string
while run:

    # First we'll check if we archive the end do the index
    if string_size <= index:
        run = False
        result.append(int(memory))
        break


    # Verify if the character on that index is the split_character
    # If True : will add on memory the input_string[index]
    if input_string[index] != split_character:
        memory = memory + input_string[index]

    # if the input_string[index] is equals to the split_character, the variable memory will be append to result and reset memory to ''
    else:
        result.append(int(memory))
        memory = ''

    index = index + 1

print(result)

You also can use the 'for' to do. Will be much simple also clear. If you had any doubts, just ask.