常见的占位符有：
%d  整数
%f  浮点数
%s  字符串
%x  十六进制整数

> 'Hello, %s' % 'world'
'Hello, world'
> 'Hi, %s, you have $%d.' % ('Michael', 1000000)
'Hi, Michael, you have $1000000.'

> '%d-%d' % (3, 23)
'3-23'
> '%2d-%2d' % (3, 23)
' 3-23'
> '%3d-%3d' % (3, 23)
' 3- 23'
> '%4d-%4d' % (3, 23)
'  3- 23'
> '%01d-%01d' % (3, 23)
'3-23'
> '%02d-%02d' % (3, 23)
'03-23'
> '%03d-%03d' % (3, 23)
'003-023'
> '%04d-%04d' % (3, 23)
'0003-0023'
>

> '%.f' % 3.1415926'3'
> '%.1f' % 3.1415926'3.1'
> '%.2f' % 3.1415926'3.14'
> '%.3f' % 3.1415926'3.142'
>

> 'Age: %s. Gender: %s' % (25, True)
'Age: 25. Gender: True'

> 'growth rate: %d %%' % 7
'growth rate: 7 %'

age = 25
name = 'Swaroop'
print('{0} is {1} years old'.format(name, age))
print('Why is {0} playing with that python"htmlcode">

Swaroop is 25 years old
Why is Swaroop playing with that python"htmlcode">

age = 25
name = 'Swaroop'
print('%s is %s years old'%(name, age))
print('Why is %s playing with that python"htmlcode">

Swaroop is 25 years old
Why is Swaroop playing with that python"font-size: large">总结

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