Best way to format integer as string with leading zeros?

python string-formatting

ramusus · Apr 9, 2009 · Viewed 422.8k times · Source

I need to add leading zeros to integer to make a string with defined quantity of digits ($cnt). What the best way to translate this simple function from PHP to Python:

function add_nulls($int, $cnt=2) {
    $int = intval($int);
    for($i=0; $i<($cnt-strlen($int)); $i++)
        $nulls .= '0';
    return $nulls.$int;
}

Is there a function that can do this?

Answer

You can use the zfill() method to pad a string with zeros:

In [3]: str(1).zfill(2)
Out[3]: '01'

Best way to format integer as string with leading zeros?

Answer

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