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 · Accepted Answer

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

User · Answer

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

User · Answer

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

User · Answer

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

User · Answer

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

User · Answer

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

User · Answer

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

User · Answer

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

User · Answer

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

User · Answer

Or another solution        0 gt 2   format number

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

User · Answer

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

User · Answer

Or this   print   0 02d   format 1

User · Answer

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

User · Answer

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

User · Answer

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

[python] Display number with leading zeros

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