## variable number of leading zeros

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In Python we can do

"file_{:03}.ext".format(i)

allowing us to easily pad any number `i`

with leading zeros to fit any given width.

But what if the desired width is only known at runtime? Can we still achieve the same effect?

Sure, string formatting supports nesting.

>>> "file_{:0{}}.ext".format(42, 3) 'file_042.ext' >>> "file_{:0{}}.ext".format(42, 5) 'file_00042.ext'

**SAS : Add leading zeros to Variable,** with 0 if you don't want to treat it as an octal number. Solution #2: Padding Numbers or Text with the RIGHT function Step 1: Add the Leading Zeros The first step is to add the same number of leading zeros to the front of the number. In Step 2: Use the RIGHT function to remove extra zeros

Since you didn’t specify the python version I’ll state this is also easily done with f-strings as well! (py3.6+)

>>> value = 42 >>> width = 3 >>> f"file_{value:0{width}}.ext" 'file_042.ext' >>> width = 5 >>> f"file_{value:0{width}}.ext" 'file_00042.ext'

**Why are integer literals with leading zeroes interpreted strangely ,** How do you add zeros in front of a number in Excel? Just specify a format that you would like to use. The following syntax will give the specified variable an eight character format. If the value has fewer than eight digits, it will have leading zeros: FORMATS numvar (n8)

Yes!

Given a desired integer width `d`

, first create a format string via string concatenation, then call format.

d = 3 format_string = "file_{:0" +str(d) + "}.ext" format_string.format(d)

yields

'file_003.ext'

**How to Add Leading Zeros to Numbers or Text with Uneven Lengths ,** How do you add leading zeros to numbers or text with uneven lengths? Viewed 4k times. 3. The format of our member numbers has changed several times over the years, such that 00008, 9538, 746, 0746, 00746, 100125, and various other permutations are valid, unique and need to be retained. Exporting from our database into the custom Excel template needed for a mass update strips the leading zeros, such that 00746 and 0746 are all truncated to 746.

**variable number of leading zeros,** Sure, string formatting supports nesting. >>> "file_{:0{}}.ext".format(42, 3) 'file_042.ext' >>> "file_{:0{}}.ext".format(42, 5) 'file_00042.ext'. When you want to display leading zeros for variable-length numbers, create a custom format with the same number of zeros (0) (in quotation marks) as leading zeros that you want to display, followed by the number sign (#). For example, if you want to format a variable-length number with three leading zeros, create the following custom number format:

**Adding leading zeros to a string variable,** If your variable is in string format, you will first need to convert it into a numeric variable using one of the following two pieces of syntax: RECODE z6. tells SAS to add 'k' number of leading zeros to the variable 'x' to maintain 6 as a length of the newly transformed variable 'xx'. In this case, 'k' = (6 - number of values in each observation in variable 'x'). In the first observation, it would add 2 leading zeros as the number of values is 4.

**FAQ: Putting leading zeros in output,** You can format variables to be reported with leading zeros by placing a zero after Many Stata users also wish to convert numeric data to strings and keep the Doing this will always display all the numbers as five digits, where leading 0’s are automatically added if the number is less than 5 digits. So 10 would become 00010 and 100 would become 00100. In this case, we have used six zeroes, but if your data has numbers with more digits, then you need to use the format accordingly.

##### Comments

- Construct the filter string dynamically, and fill in whatever value you want instead of
`03`

. - Yeah, I figured it out after I asked it :)
- Oh cool, I tried several things but wasn't able to get the nesting working. Nice!
- Now that's some sorcery!