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Filtering Items Based on Digit Positions in Python

In this example, we filter a list of strings based on a specific digit pattern. The goal is to find all items where the last digit is equal to the third-from-last digit, but only if those digits are between 0 and 5.

Filter Logic

• Check if the string length is at least 3.
• Check if item[-1] == item[-3].
• Check if that digit is in the set {'0', '1', '2', '3', '4', '5'}.

This helps identify patterns like '770410232' where the last digit '2' matches the third-from-last digit '2'.

Filtered Items List

filtered_items = [
    '770410232', '770410252', '770410353', '770410434', '770410454', '770410535', '770410545',
    '770411232', '770411252', '770411343', '770411353', '770411454', '770411535', '770411545',
    '770412353', '770412434', '770412454', '770412535', '770412545', '770413202', '770413212',
    '770413242', '770413252', '770413414', '770413424', '770413454', '770413515', '770413525',
    '770413545', '770414313', '770414323', '770414515', '770414525', '770414535', '770415121',
    '770415202', '770415212', '770415232', '770415242', '770415303', '770415313', '770415343',
    '770415404', '770415424', '771140151', '771140232', '771140242', '771140252', '771140343',
    '771140535', '771140545', '771141232', '771141242', '771141252', '771141343', '771141535',
    '771142131', '771142141', '771142313', '771142343', '771142535', '771142545', '771143101',
    '771143121', '771143141', '771143151', '771143242', '771143252', '771143505', '771143515',
    '771143525', '771144131', '771144232', '771144303', '771144313', '771144323', '771144515',
    '771144525', '771144535', '771145101', '771145121', '771145131', '771145141', '771145202',
    '771145212', '771145232', '771145242', '771145313', '771145343',
]

Summary

This filtered list contains all items matching the digit pattern rule described above. The approach can be adapted for other positional digit checks or patterns in strings.