string format

2 methods
​
1. % method
2. format() method
​
example)
In [7]: '%s, A, %s, and B' % ('first', 'second')
Out[7]: 'first, A, second, and B'
​
In [8]: '{}, A, {}, and B'.format('first', 'second')
Out[8]: 'first, A, second, and B'
​
In [20]: '{:>30,.2f}'.format(296999.2567)
Out[20]: ' 296,999.26'
​
In [21]: '{:>30,.2f}'.format(296999.2567)
Out[21]: ' 296,999.26'
​
In [22]: '{:>20,.2f}'.format(296999.2567)
Out[22]: ' 296,999.26'
​
In [23]: '{:->20,.2f}'.format(296999.2567)
Out[23]: '----------296,999.26'
​
In [24]: '{:_>20,.2f}'.format(296999.2567)
Out[24]: '__________296,999.26'
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