How to format a floating number to fixed width in Python

Question

How do I format a floating number to a fixed width with the following requirements    Leading zero if n  lt  1 Add trailing decimal zero s  to fill up fixed width Truncate decimal digits past fixed width Align all decimal points   For example     formatter something like    06   numbers    23 23  0 123334987  1  4 223  9887 2   for number in numbers      print formatter format number    The output would be like    23 2300    0 1233    1 0000    4 2230 9887 2000

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I needed something similar for arrays  That helped me  some array rounded np around some array  5

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It has been a few years since this was answered  but as of Python 3 6  PEP498  you could use the new f-strings  numbers    23 23  0 123334987  1  4 223  9887 2   for number in numbers      print f  number 9 4f     Prints    23 2300    0 1233    1 0000    4 2230 9887 2000

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You can also left pad with zeros  For example if you want number to have 9 characters length  left padded with zeros use    print    09 3f   format number    Thus  if number   4 656  the output is  00004 656  For your example the output will look like this   numbers     23 2300  0 1233  1 0000  4 2230  9887 2000  for x in numbers       print    010 4f   format x     prints   00023 2300 00000 1233 00001 0000 00004 2230 09887 2000   One example where this may be useful is when you want to properly list filenames in alphabetical order  I noticed in some linux systems  the number is  1 10 11   2 20 21      Thus if you want to enforce the necessary numeric order in filenames  you need to left pad with the appropriate number of zeros

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In Python 3   GPA   2 5 print    6 1f     GPA    6 1f means after the dots 1 digits show if you print 2 digits after the dots you should only  6 2f such that  6 3f 3 digits print after the point

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This will print 76 66  print  quot Number   quot   f quot  76 663254   2f  quot

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See Python 3 x format string syntax   IDLE 3 5 1    numbers     23 23     1233    1    4 223    9887 2    for x in numbers        print   0   gt  016 4f    format float x            23 2300       0 1233       1 0000       4 2230    9887 2000

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for x in numbers      print    10 4f   format x    prints     23 2300     0 1233     1 0000     4 2230  9887 2000   The format specifier inside the curly braces follows the Python format string syntax  Specifically  in this case  it consists of the following parts    The empty string before the colon means  take the next provided argument to format        in this case the x as the only argument  The 10 4f part after the colon is the format specification  The f denotes fixed-point notation  The 10 is the total width of the field being printed  lefted-padded by spaces  The 4 is the number of digits after the decimal point

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In python3 the following works    gt  gt  gt  v 10 4  gt  gt  gt  print    6 2f    v    10 40  gt  gt  gt  print    12 1f    v          10 4  gt  gt  gt  print   012 1f    v  0000000010 4

[python] How to format a floating number to fixed width in Python

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