blocks|key|1738662|text|在其他一些语言中，如果使用单引号，则不会解释元字符。以Ruby中的示例为例：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1738663|irb(main):001:0>+puts+"string1\nstring2"
string1
string2
=>+nil
irb(main):002:0>+puts+'string1\nstring2'
string1\nstring2
=>+nil|code-block|syntax|javascript|1738664|在Python中，如果您希望按字面理解字符串，则可以使用原始字符串(+'r‘字符前面的字符串)：|1738665|>>>+print+'string1\nstring2'
string1
string2
>>>+print+r'string1\nstring2'
string1\nstring2|1738666|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

In some other languages, meta characters are not interpreted if you use single quotes. Take this example in Ruby:

<pre><code>irb(main):001:0&gt; puts "string1\nstring2"
string1
string2
=&gt; nil
irb(main):002:0&gt; puts 'string1\nstring2'
string1\nstring2
=&gt; nil
</code></pre>

In Python, if you want the string to be taken literally, you can use raw strings (a string preceded by the 'r' character):

<pre><code>&gt;&gt;&gt; print 'string1\nstring2'
string1
string2
&gt;&gt;&gt; print r'string1\nstring2'
string1\nstring2
</code></pre>

blocks|key|1738631|text|Python中的单引号字符串和双引号字符串是相同的。唯一的区别是单引号字符串可以包含未转义的双引号字符，反之亦然。例如：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1738632|'a+"quoted"+word'
"another+'quoted'+word"|code-block|syntax|javascript|1738633|此外，还有三重引号的字符串，它允许对引号字符和换行符进行非转义。|1738634|您可以使用命名说明符和locals()内置替换字符串中的变量：|1738635|name+=+'John'
lastname+=+'Smith'
print+'My+name+is+%25(name)s+%25(lastname)s'+%25+locals()++#+prints+'My+name+is+John+Smith'|1738636|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Q|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|R|8|@]|9|@]|A|$]]|$1|K|3|L|5|D|7|S|8|@]|9|@]|A|$E|F]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

Single and double quoted strings in Python are identical. The only difference is that single-quoted strings can contain unescaped double quote characters, and vice versa. For example:

<pre><code>'a "quoted" word'
"another 'quoted' word"
</code></pre>

Then again, there are triple-quoted strings, which allow both quote chars and newlines to be unescaped.

You can substitute variables in a string using named specifiers and the locals() builtin:

<pre><code>name = 'John'
lastname = 'Smith'
print 'My name is %(name)s %(lastname)s' % locals() # prints 'My name is John Smith'
</code></pre>

blocks|key|1523746|text|交互式Python解释器更喜欢单引号：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1523747|>>>+"text"
'text'

>>>+'text'
'text'|code-block|syntax|javascript|1523748|这可能会让初学者感到困惑，所以我坚持使用单引号(除非您有不同的编码标准)。|1523749|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

The interactive Python interpreter prefers single quotes:

<pre><code>&gt;&gt;&gt; "text"
'text'

&gt;&gt;&gt; 'text'
'text'
</code></pre>

This could be confusing to beginners, so I'd stick with single quotes (unless you have different coding standards).

blocks|key|1523497|text|在python中，有3种方法可以查询字符串："+string“'+string‘”string+string“它们都会产生相同的结果。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1523498|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

There are 3 ways you can qoute strings in python:
"string"
'string'
"""
string
string
"""
they all produce the same result.

blocks|key|1738573|text|在Python中没有什么不同，在生成XML时，您可以真正利用它。正确的XML语法要求用双引号将属性值括起来，并且在许多语言中，例如Java，这会迫使您在创建如下字符串时对其进行转义：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1738574|String+HtmlInJava+=+"<body+bgcolor=\"Pink\">"|code-block|syntax|javascript|1738575|但在Python中，您只需使用另一个引号，并确保使用匹配的结束引号，如下所示：|1738576|html_in_python+=+'<body+bgcolor="Pink">'|1738577|很不错吧？您还可以使用三个双引号来开始和结束多行字符串，其中的EOL如下所示：|1738578|multiline_python_string+=+"""
This+is+a+multi-line+Python+string+which+contains+line+breaks+in+the+
resulting+string+variable,+so+this+string+has+a+'\n'+after+the+word
'resulting'+and+the+first+word+'word'."""|1738579|entityMap^0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|S|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|T|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|U|8|@]|9|@]|A|$]]|$1|M|3|N|5|D|7|V|8|@]|9|@]|A|$E|F]]|$1|O|3|-4|5|6|7|W|8|@]|9|@]|A|$]]]|P|$]]

There is no difference in Python, and you can really use it to your advantage when generating XML. Correct XML syntax requires double-quotes around attribute values, and in many languages, such as Java, this forces you to escape them when creating a string like this:

<pre><code>String HtmlInJava = "&lt;body bgcolor=\"Pink\"&gt;"
</code></pre>

But in Python, you simply use the other quote and make sure to use the matching end quote like this:

<pre><code>html_in_python = '&lt;body bgcolor="Pink"&gt;'
</code></pre>

Pretty nice huh? You can also use three double quotes to start and end multi-line strings, with the EOL's included like this:

<pre><code>multiline_python_string = """
This is a multi-line Python string which contains line breaks in the 
resulting string variable, so this string has a '\n' after the word
'resulting' and the first word 'word'."""
</code></pre>

blocks|key|1523699|text|是。那些声称在Python中单引号和双引号相同的人大错特错了。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1523700|否则，在下面的代码中，双引号字符串不会额外花费4.5%25的时间来处理Python：|1523701|import+time

time_single+=+0
time_double+=+0

for+i+in+range(10000000):
++++#+String+Using+Single+Quotes
++++time1+=+time.time()
++++str_single1+=+'Somewhere+over+the+rainbow+dreams+come+true'
++++str_single2+=+str_single1
++++time2+=+time.time()
++++time_elapsed+=+time2+-+time1
++++time_single+%2B=+time_elapsed

++++#+String+Using+Double+Quotes+
++++time3+=+time.time()
++++str_double1+=+"Somewhere+over+the+rainbow+dreams+come+true"
++++str_double2+=+str_double1
++++time4+=+time.time()
++++time_elapsed+=+time4+-+time3
++++time_double+%2B=+time_elapsed

print+'Time+using+single+quotes:+'+%2B+str(time_single)
print+'Time+using+double+quotes:+'+%2B+str(time_double)|code-block|syntax|javascript|1523702|输出：|1523703|>python_quotes_test.py
Time+using+single+quotes:+13.9079978466
Time+using+double+quotes:+14.5360121727|1523704|因此，如果你想要快速、干净、令人尊敬的代码，而你似乎知道自己的东西，那么只要可行，就应该在字符串中使用单引号。跳过shift键还可以减少能源消耗。|1523705|entityMap^0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|R|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|S|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|T|8|@]|9|@]|A|$]]|$1|K|3|L|5|F|7|U|8|@]|9|@]|A|$G|H]]|$1|M|3|N|5|6|7|V|8|@]|9|@]|A|$]]|$1|O|3|-4|5|6|7|W|8|@]|9|@]|A|$]]]|P|$]]

Yes. 
Those claiming single and double quotes are identical in Python are simply wrong.

Otherwise in the following code, the double-quoted string would not have taken an extra 4.5% longer for Python to process:

<pre><code>import time

time_single = 0
time_double = 0

for i in range(10000000):
 # String Using Single Quotes
 time1 = time.time()
 str_single1 = 'Somewhere over the rainbow dreams come true'
 str_single2 = str_single1
 time2 = time.time()
 time_elapsed = time2 - time1
 time_single += time_elapsed

 # String Using Double Quotes 
 time3 = time.time()
 str_double1 = "Somewhere over the rainbow dreams come true"
 str_double2 = str_double1
 time4 = time.time()
 time_elapsed = time4 - time3
 time_double += time_elapsed

print 'Time using single quotes: ' + str(time_single)
print 'Time using double quotes: ' + str(time_double)
</code></pre>

Output:

<pre><code>&gt;python_quotes_test.py
Time using single quotes: 13.9079978466
Time using double quotes: 14.5360121727
</code></pre>

So if you want fast clean respectable code where you seem to know your stuff, use single quotes for strings whenever practical. You will also expend less energy by skipping the shift key.

In PHP, a string enclosed in "double quotes" will be parsed for variables to replace whereas a string enclosed in 'single quotes' will not. In Python, does this also apply?

Is there any difference between "string" and 'string' in Python?

解释器

Python

Java

在PHP中，包含在“双引号”中的字符串将被解析为要替换的变量，而包含在“单引号”中的字符串则不会。在Python中，这也适用吗？

问Python中的"string“和”string“有什么区别吗？
EN

回答 6

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问Python中的"string“和”string“有什么区别吗？EN

回答 6

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问Python中的"string“和”string“有什么区别吗？
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