strzfill

strzfill is a function found in some programming languages and libraries that is used to pad a string with a specific character until it reaches a desired length. This padding is typically applied to the left side of the string, hence the "str" for string and "zfill" which implies zero-padding, although the padding character can be specified. For example, if you have the string "123" and want to pad it to a length of 5 with zeros, strzfill would produce "00123". Similarly, padding with a space would result in " 123". This function is particularly useful for formatting numerical data, such as ensuring all numbers in a list have the same number of digits for alignment in output or when preparing data for systems that expect fixed-width fields. The exact implementation and name may vary between languages; for instance, Python has a method called `zfill()` for its string objects which performs this exact operation. Other languages might offer similar functionality through different function names or by combining substring and concatenation operations.