blocks|key|79572|text|在Python+3中，您只能打印为：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|79573|print("STRING")|code-block|syntax|javascript|79574|但在Python+2中，括号不是必需的。|79575|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|$]]

In Python 3, you can only print as:

<pre><code>print("STRING")
</code></pre>

But in Python 2, the parentheses are not necessary.

blocks|key|4586288|text|从Python+2到Python+3的语法发生了变化。在Python+2中，|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4586289|print+"Hello,+World!"+|code-block|syntax|javascript|4586290|将有效，但在Python+3中，请使用括号作为|4586291|print("Hello,+World!")|4586292|这相当于Scala的语法，接近于Java。|4586293|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]]|$1|G|3|H|5|6|7|Q|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|S|8|@]|9|@]|A|$]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

There is a change in syntax from Python 2 to Python 3.
In Python 2,

<pre><code>print "Hello, World!" 
</code></pre>

will work but in Python 3, use parentheses as 

<pre><code>print("Hello, World!")
</code></pre>

This is equivalent syntax to Scala and near to Java.

blocks|key|4586443|text|不幸的是，旧的xkcd+comic已经不是完全最新的了。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|4586444|​|4586445|📷|atomic|4586446|4586447|从Python+3.0开始，你必须写：|4586448|print("Hello,+World!")|code-block|syntax|javascript|4586449|还得有人去写那个antigravity库:(|style|CODE|4586450|entityMap|0|LINK|mutability|MUTABLE|url|http://xkcd.com/353/|1|IMAGE|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/bcc0b85f5cedb72a4c15ae8efbe17f63.png|imageAlt^0|7|A|0|0|0|0|1|1|0|0|0|0|8|B|0^^$0|@$1|2|3|4|5|6|7|18|8|@]|9|@$A|19|B|1A|1|1B]]|C|$]]|$1|D|3|E|5|6|7|1C|8|@]|9|@]|C|$]]|$1|F|3|G|5|H|7|1D|8|@]|9|@$A|1E|B|1F|1|1G]]|C|$]]|$1|I|3|E|5|6|7|1H|8|@]|9|@]|C|$]]|$1|J|3|K|5|6|7|1I|8|@]|9|@]|C|$]]|$1|L|3|M|5|N|7|1J|8|@]|9|@]|C|$O|P]]|$1|Q|3|R|5|6|7|1K|8|@$A|1L|B|1M|S|T]]|9|@]|C|$]]|$1|U|3|-4|5|6|7|1N|8|@]|9|@]|C|$]]]|V|$W|$5|X|Y|Z|C|$10|11]]|12|$5|13|Y|14|C|$15|16|17|-4]]]]

Unfortunately, the old <a href="http://xkcd.com/353/" rel="noreferrer">xkcd comic</a> isn't completely up to date anymore.

<a href="http://xkcd.com/353/" rel="noreferrer"><img src="https://imgs.xkcd.com/comics/python.png" alt="https://imgs.xkcd.com/comics/python.png" title="I wrote 20 short programs in Python yesterday. It was wonderful. Perl, I&#39;m leaving you."></a>

Since Python 3.0 you have to write:

<pre><code>print("Hello, World!")
</code></pre>

And someone has still to write that <code>antigravity</code> library :(

blocks|key|4586481|text|如果您的代码可以在Python+2和Python+3中运行，则可以通过在程序开始时加载以下代码来实现：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4586482|from+__future__+import+print_function+++#+If+code+has+to+work+in+Python+2+and+3!|code-block|syntax|javascript|4586483|然后你可以用Python+3的方式打印：|4586484|print("python")|4586485|如果你想打印一些东西而不创建新的行，你可以这样做：|4586486|for+number+in+range(0,+10):
++++print(number,+end=',+')|4586487|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|$]]

If your code should work in both Python 2 and 3, you can achieve this by loading this at the beginning of your program:

<pre><code>from __future__ import print_function # If code has to work in Python 2 and 3!
</code></pre>

Then you can print in the Python 3 way:

<pre><code>print("python")
</code></pre>

If you want to print something without creating a new line - you can do this:

<pre><code>for number in range(0, 10):
 print(number, end=', ')
</code></pre>

blocks|key|79873|text|除了这里的直接答案之外，我们还应该注意到Python2和Python3之间的另一个关键区别。official+python+wiki介绍了几乎所有的主要区别，并将重点放在何时应该使用这两个版本中的任何一个。This+blog+post还很好地解释了当前的python领域以及迁移到Python3的未解之谜。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|79874|据我所知，您已经开始学习python语言了。在继续学习python+3之前，您应该考虑前面提到的文章。您不仅需要更改一些语法，还需要考虑哪些包将对您可用(+python+2的优势)，以及可以在代码中进行的潜在优化(+python+3的优势)。|79875|entityMap|0|LINK|mutability|MUTABLE|url|https://wiki.python.org/moin/Python2orPython3|1|https://learntocodewith.me/programming/python/python-2-vs-python-3/^0|1A|K|0|2V|E|1|0|0^^$0|@$1|2|3|4|5|6|7|P|8|@]|9|@$A|Q|B|R|1|S]|$A|T|B|U|1|V]]|C|$]]|$1|D|3|E|5|6|7|W|8|@]|9|@]|C|$]]|$1|F|3|-4|5|6|7|X|8|@]|9|@]|C|$]]]|G|$H|$5|I|J|K|C|$L|M]]|N|$5|I|J|K|C|$L|O]]]]

Outside of the direct answers here, one should note the other key difference between python 2 and 3. The <a href="https://wiki.python.org/moin/Python2orPython3" rel="nofollow noreferrer">official python wiki</a> goes into almost all of the major differences and focuses on when you should use either of the versions. <a href="https://learntocodewith.me/programming/python/python-2-vs-python-3/" rel="nofollow noreferrer">This blog post</a> also does a fine job of explaining the current python universe and the somehow unsolved puzzle of moving to python 3.

As far as I can tell, you are beginning to learn the python language. You should consider the aforementioned articles before you continue down the python 3 route. Not only will you have to change some of your syntax, you will also need to think about which packages will be available to you (an advantage of python 2) and potential optimizations that could be made in your code (an advantage of python 3).

blocks|key|79891|text|print('Hello,+World!')|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|79892|您使用的是python+3，在打印时需要使用括号。|79893|entityMap^0|0|M|0|0^^$0|@$1|2|3|4|5|6|7|J|8|@$9|K|A|L|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|M|8|@]|D|@]|E|$]]|$1|H|3|-4|5|6|7|N|8|@]|D|@]|E|$]]]|I|$]]

<code>print('Hello, World!')</code>
You're using python 3, where you need brackets when printing.

When I try to use a <code>print</code> statement in Python, it gives me this error:

<pre><code>&gt;&gt;&gt; print "Hello, World!"
 File "&lt;stdin&gt;", line 1
 print "Hello, World!"
 ^
SyntaxError: Missing parentheses in call to 'print'
</code></pre>

What does that mean?

What does "SyntaxError: Missing parentheses in call to 'print'" mean in Python?

Python

Java

当我尝试在Python语言中使用print语句时，出现以下错误：>>> print "Hello, World!" File "<stdin>", line 1 print "Hello, World!" ^SyntaxError: Missing parenthe...

问在Python语言中，"SyntaxError:调用‘打印’时缺少括号“是什么意思？
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问在Python语言中，"SyntaxError:调用‘打印’时缺少括号“是什么意思？
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