Width and Precision : Format « String « Python Tutorial






from math import pi 

print '%10f' % pi # Field width 10 

print '%10.2f' % pi # Field width 10, precision 2 

print '%.2f' % pi # Precision 2 

print '%.5s' % 'Guido van Rossum' 

use an * as the width or precision (or both), in which case the number will be read from the tuple argument

print '%.*s' % (5, 'Guido van Rossum')








5.10.Format
5.10.1.String formatting is done with the string formatting operator, the percent (%) sign.
5.10.2.Formatted String
5.10.3.String format
5.10.4.A basic conversion specifier
5.10.5.use the string format operator ( % ), or put all of the substrings in a list, and using one join() call to put them all together
5.10.6.The syntax for using the format operator is as follows: format_string % (arguments_to_convert)
5.10.7.Format Operator Auxiliary Directives
5.10.8.String Formatting Conversion Types
5.10.9.print paired with the string format operator ( % )
5.10.10.Width and Precision
5.10.11.Signs, Alignment, and Zero-Padding
5.10.12.A minus sign (-) left-aligns the value:
5.10.13.A blank (" ") means that a blank should be put in front of positive numbers
5.10.14.a plus (+) means that a sign should precede both positive and negative numbers
5.10.15.String formatting.
5.10.16.String-formatting codes
5.10.17.%[(name)][flags][width][.precision]code
5.10.18.The %e, %f, and %g formats display floating-point numbers in different ways, as the following interaction demonstrates:
5.10.19.Dictionary-Based String Formatting