Display number with leading zeros

Question

Given   a   1 b   10 c   100   How do I display a leading zero for all numbers with less than two digits   This is the output I m expecting   01 10 100

User · Answer

You can do this with f strings   import numpy as np  print f  np random choice  1  124  13566   0 gt 8      This will print constant length of 8  and pad the rest with leading 0   00000001 00000124 00013566

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df  Col1   df  Col1   apply lambda x    0 0 gt 5   format x     The 5 is the number of total digits   I used this link  http   www datasciencemadesimple com add-leading-preceding-zeros-python

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The Pythonic way to do this   str number  rjust string width  fill char    This way  the original string is returned unchanged if its length is greater than string width  Example   a    1  10  100  for num in a      print str num  rjust 2   0     Results   01 10 100

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Or this   print   0 02d   format 1

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Use    00  len str i       str i    Or with the math module   import math  00  math ceil math log i  10       str i

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In Python 2 6  and 3 0   you would use the format   string method   for i in  1  10  100       print   num 02d   format num i     or using the built-in  for a single number    print format i   02d      See the PEP-3101 documentation for the new formatting functions

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This is how I do it   str 1  zfill len str total      Basically zfill takes the number of leading zeros you want to add  so it s easy to take the biggest number  turn it into a string and get the length  like this    Python 3 6 5  default  May 11 2018  04 00 52    GCC 8 1 0  on linux Type  help    copyright    credits  or  license  for more information      total   100     print str 1  zfill len str total     001     total   1000     print str 1  zfill len str total     0001     total   10000     print str 1  zfill len str total     00001

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In Python    3 6  you can do this succinctly with the new f-strings that were introduced by using   f  val 02     which prints the variable with name val with a fill value of 0 and a width of 2    For your specific example you can do this nicely in a loop   a  b  c   1  10  100 for val in  a  b  c       print f  val 02      which prints   01  10 100     For more information on f-strings  take a look at PEP 498 where they were introduced

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Or another solution        0 gt 2   format number

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width   5 num   3 formatted    width - len str num       0    str num  print formatted

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If dealing with numbers that are either one or two digits    0  str number  -2   or  0 0   format number  -2

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You can use str zfill   print str 1  zfill 2   print str 10  zfill 2   print str 100  zfill 2     prints   01 10 100

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In Python 2  and Python 3  you can do   print   02d     1     Basically   is like printf or sprintf  see docs      For Python 3    the same behavior can also be achieved with format   print    02d   format 1       For Python 3 6  the same behavior can be achieved with f-strings   print f  1 02d

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x    1  10  100  for i in x      print   02d    i   results in   01 10 100   Read more information about string formatting using   in the documentation

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Use a format string - http   docs python org lib typesseq-strings html  For example   python -c  print    num 02d      num  5

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print    02   format 1   print    02   format 10   print    02   format 100     prints   01 10 100

[python] Display number with leading zeros

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