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String_incrementer.py
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String_incrementer.py
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# Kata link:
# https://www.codewars.com/kata/54a91a4883a7de5d7800009c/train/python
# -------------------------------------
# Instructions:
'''
Your job is to write a function which increments a string, to create a new
string.
If the string already ends with a number, the number should be incremented
by 1.
If the string does not end with a number. The number 1 should be appended
to the new string.
Examples:
foo -> foo1
foobar23 -> foobar24
foo0042 -> foo0043
foo9 -> foo10
foo099 -> foo100
Attention: If the number has leading zeros the amount of digits should be considered.
'''
# -------------------------------------
# Solution:
import re
def increment_string(strng):
pattern = r'\d+$'
numbers = re.findall(pattern, strng)
if strng and numbers:
num = str(int(numbers[0]) + 1).zfill(len(numbers[0]))
return re.sub(pattern, num, strng)
return strng + '1'
# -------------------------------------
# Basic Tests
print(increment_string("foo"), "foo1")
print(increment_string("foobar001"), "foobar002")
print(increment_string("foobar1"), "foobar2")
print(increment_string("foobar00"), "foobar01")
print(increment_string("foobar99"), "foobar100")
print(increment_string("foobar099"), "foobar100")
print(increment_string(""), "1")