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python slicing example
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| def format_number(n): | |
| """ | |
| Format a number by inserting commas as a thousands separator. | |
| """ | |
| str_number = str(n) | |
| if len(str_number) <= 3: | |
| return str_number | |
| last3 = str_number[-3:] | |
| rest = str_number[:-3] | |
| return format_number(int(rest)) + ',' + last3 | |
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