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Update p15_interpolating_variables_in_strings.rst

'%(name) has %(n) messages.' % vars()格式化错误,应该是'%{name} has %{n} messages.' % vars()

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Original file line number	Diff line number	Diff line change
`@@ -106,7 +106,7 @@ Python并没有对在字符串中简单替换变量值提供直接的支持。`
`106`	`106`
`107`	`107`	`>>> name = 'Guido'`
`108`	`108`	`>>> n = 37`
`109`		`- >>> '%(name) has %(n) messages.' % vars()`
	`109`	`+ >>> '%{name} has %{n} messages.' % vars()`
`110`	`110`	`'Guido has 37 messages.'`
`111`	`111`	`>>>`
`112`	`112`

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