blocks|key|368992|text|这叫做打印格式化。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|368993|查看更多示例Ruby+Formatted+Printing|offset|length|368994|你有没有尝试过像"%25d"%2510这样的东西？它的计算结果为"10"|style|CODE|368995|1.9.3-p0+:003+>+"%2502x"%25(10)
+=>+"0a"+
1.9.3-p0+:004+>+

1.9.3-p0+:005+>+print+"Nicely+formatted+string+with+an+int:+%25d"+%25+10
Nicely+formatted+string+with+an+int:+10+=>+nil+
1.9.3-p0+:006+>+|code-block|syntax|javascript|368996|entityMap|0|LINK|mutability|MUTABLE|url|http://www.wellho.net/resources/ex.php4?item=r109/d4_6^0|0|6|N|0|0|8|7|S|4|0|0^^$0|@$1|2|3|4|5|6|7|W|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|X|8|@]|9|@$D|Y|E|Z|1|10]]|A|$]]|$1|F|3|G|5|6|7|11|8|@$D|12|E|13|H|I]|$D|14|E|15|H|I]]|9|@]|A|$]]|$1|J|3|K|5|L|7|16|8|@]|9|@]|A|$M|N]]|$1|O|3|-4|5|6|7|17|8|@]|9|@]|A|$]]]|P|$Q|$5|R|S|T|A|$U|V]]]]

It's called print formatting.

Checkout more examples <a href="http://www.wellho.net/resources/ex.php4?item=r109/d4_6" rel="nofollow">Ruby Formatted Printing</a>

Have you tried anything like <code>"%d"%10</code> ? It evaluates to <code>"10"</code>

<pre><code>1.9.3-p0 :003 &gt; "%02x"%(10)
 =&gt; "0a" 
1.9.3-p0 :004 &gt; 

1.9.3-p0 :005 &gt; print "Nicely formatted string with an int: %d" % 10
Nicely formatted string with an int: 10 =&gt; nil 
1.9.3-p0 :006 &gt; 
</code></pre>

blocks|key|584773|text|n1,+n2+=+17,+42
puts+"Lucky+single+number:+%25d"+%25+n1
puts+"Lucky+multiple+numbers:+%25d+%25d"+%25+[+n1,+n2+]
puts+"Lucky+inline+interpolation:+#{n1}+#{n2}"|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|584774|有关String#%25方法中允许的格式的文档，请阅读Kernel#sprintf。|unstyled|offset|length|style|CODE|584775|entityMap|0|LINK|mutability|MUTABLE|url|http://www.ruby-doc.org/core-1.9.3/String.html#method-i-25|1|http://www.ruby-doc.org/core-1.9.3/Kernel.html#method-i-sprintf^0|0|2|8|P|E|2|8|0|P|E|1|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|V|8|@$G|W|H|X|I|J]|$G|Y|H|Z|I|J]]|9|@$G|10|H|11|1|12]|$G|13|H|14|1|15]]|A|$]]|$1|K|3|-4|5|F|7|16|8|@]|9|@]|A|$]]]|L|$M|$5|N|O|P|A|$Q|R]]|S|$5|N|O|P|A|$Q|T]]]]

<pre><code>n1, n2 = 17, 42
puts "Lucky single number: %d" % n1
puts "Lucky multiple numbers: %d %d" % [ n1, n2 ]
puts "Lucky inline interpolation: #{n1} #{n2}"
</code></pre>

For documentation of the formatting allowed in <a href="http://www.ruby-doc.org/core-1.9.3/String.html#method-i-25" rel="noreferrer"><code>String#%</code></a> method read up on <a href="http://www.ruby-doc.org/core-1.9.3/Kernel.html#method-i-sprintf" rel="noreferrer"><code>Kernel#sprintf</code></a>.

blocks|key|369045|text|num1+=+4++
num2+=+2++
print+"Lucky+numbers:+%25d+%25d"+%25+[num1,+num2]|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|369046|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>num1 = 4 
num2 = 2 
print "Lucky numbers: %d %d" % [num1, num2]
</code></pre>

blocks|key|369096|text|最接近Python语法的Ruby方法是sprintf和format，它们是彼此的别名。您可以在Ruby+Docs中深入了解它们。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|369097|下面是一个例子：|369098|num1+=+4
num2+=+2
sprintf("Lucky+numbers:+%25d+%25d",+num1,+num2)|code-block|syntax|javascript|369099|这将输出：“幸运数字:4+2”|369100|当然，括号是可选的。|369101|entityMap|0|LINK|mutability|MUTABLE|url|http://www.ruby-doc.org/core-1.9.3/Kernel.html#method-i-sprintf^0|J|7|R|6|1B|9|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Y|8|@$9|Z|A|10|B|C]|$9|11|A|12|B|C]]|D|@$9|13|A|14|1|15]]|E|$]]|$1|F|3|G|5|6|7|16|8|@]|D|@]|E|$]]|$1|H|3|I|5|J|7|17|8|@]|D|@]|E|$K|L]]|$1|M|3|N|5|6|7|18|8|@]|D|@]|E|$]]|$1|O|3|P|5|6|7|19|8|@]|D|@]|E|$]]|$1|Q|3|-4|5|6|7|1A|8|@]|D|@]|E|$]]]|R|$S|$5|T|U|V|E|$W|X]]]]

The Ruby methods that most closely mimics that syntax in Python are <code>sprintf</code> and <code>format</code>, which are aliases for each other. You can read about them in depth in the <a href="http://www.ruby-doc.org/core-1.9.3/Kernel.html#method-i-sprintf" rel="nofollow">Ruby Docs</a>.

Here's an example:

<pre><code>num1 = 4
num2 = 2
sprintf("Lucky numbers: %d %d", num1, num2)
</code></pre>

This would output: "Lucky Numbers: 4 2"

Parenthesis are of course optional.

blocks|key|584900|text|您还可以使用散列进行字符串替换。如果您有多个实例需要替换为相同的字符串，这将非常有用。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|584901|p+"%25{foo}+==+%25{foo}"+%25+{:foo+=>+"bar"+}
#+=>+"bar+==+bar"|code-block|syntax|javascript|584902|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

You can also use a hash for string substitution. This is useful if you have multiple instances that need be replaced with the same string.

<pre><code>p "%{foo} == %{foo}" % {:foo =&gt; "bar" }
# =&gt; "bar == bar"
</code></pre>

Don't know what the term is called (substitution?), but in python if you type 

<pre><code>num1 = 4 
num2 = 2 
print("Lucky numbers: %d %d" %(num1, num2))
</code></pre>

You get "Lucky numbers: 4 2"

How do I do this in ruby?

Trying to do the above scenario, it works if I have one variable, but if I need to sub in multiple variables the parentheses aren't valid syntax.

Ruby string substitution

Python

我不知道这个术语叫什么(替换？)，但是在python中，如果你输入num1 = 4  num2 = 2  print("Lucky numbers: %d %d" %(num1, num2))你会得到“幸运数字:4 2”我如何在ruby中做到这一点？尝试执行上面的场景，如果我只有一个变量，那么它就可以工作，但是如果我需...

问Ruby字符串替换
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