Convert to binary and keep leading zeros in Python

Question

I m trying to convert an integer to binary using the bin   function in Python  However  it always removes the leading zeros  which I actually need  such that the result is always 8-bit   Example   bin 1  - gt  0b1    What I would like  bin 1  - gt  0b00000001   Is there a way of doing this

User · Answer

gt  gt  gt     08b   format 1   00000001    See  Format Specification Mini-Language    Note for Python 2 6 or older  you cannot omit the positional argument identifier before    so use   gt  gt  gt    0 08b   format 1   00000001

User · Answer

I am using  bin 1  2   zfill 8    will print    00000001

User · Answer

You can use something like this       0 db   length  format num

User · Answer

you can use rjust string  method of python  syntax  string rjust length  fillchar  fillchar is optional   and for your Question you acn write like this    0b    1  rjust 8  0    so it wil be  0b00000001

User · Answer

When using Python  gt   3 6  the cleanest way is to use f-strings with string formatting    gt  gt  gt  var   23  gt  gt  gt  f  var  010b    0b00010111    Explanation    var the variable to format   everything after this is the format specifier   use the alternative form  adds the 0b prefix  0 pad with zeros 10 pad to a total length off 10  this includes the 2 chars for 0b  b use binary representation for the number

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Use the format   function    gt  gt  gt  format 14    010b    0b00001110    The format   function simply formats the input following the Format Specification mini language  The   makes the format include the 0b prefix  and the 010 size formats the output to fit in 10 characters width  with 0 padding  2 characters for the 0b prefix  the other 8 for the binary digits   This is the most compact and direct option   If you are putting the result in a larger string  use an formatted string literal  3 6   or use str format   and put the second argument for the format   function after the colon of the placeholder          gt  gt  gt  value   14  gt  gt  gt  f The produced output  in binary  is   value  010b    The produced output  in binary  is  0b00001110   gt  gt  gt   The produced output  in binary  is     010b   format value   The produced output  in binary  is  0b00001110    As it happens  even for just formatting a single value  so without putting the result in a larger string   using a formatted string literal is faster than using format      gt  gt  gt  import timeit  gt  gt  gt  timeit timeit  f  v    010b      v   14  f    format      use a local for performance 0 40298633499332936  gt  gt  gt  timeit timeit  f  v  010b      v   14   0 2850222919951193   But I d use that only if performance in a tight loop matters  as format      communicates the intent better   If you did not want the 0b prefix  simply drop the   and adjust the length of the field    gt  gt  gt  format 14   08b    00001110

User · Answer

You can use the string formatting mini language   def binary num  pre  0b   length 8  spacer 0       return   0     1  gt  2     format pre  spacer  length  format bin num  2      Demo   print binary 1    Output    0b00000001    EDIT  based on  Martijn Pieters idea  def binary num  length 8       return format num    0  b  format length   2

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Sometimes you just want a simple one liner   binary      join    0 08b   format ord x   for x in input     Python 3

User · Answer

You can use zfill   print str 1  zfill 2   print str 10  zfill 2   print str 100  zfill 2    prints   01 10 100   I like this solution  as it helps not only when outputting the number  but when you need to assign it to a variable     e g  -  x   str datetime date today   month  zfill 2  will return x as  02  for the month of feb

[python] Convert to binary and keep leading zeros in Python

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