Python 中的 GString

发布于 2024-07-18 03:22:58 字数 223 浏览 4 评论 0原文

Groovy 有一个 GString 的概念。我可以编写这样的代码：

def greeting = 'Hello World'
println """This is my first program ${greeting}"""

我可以从字符串中访问变量的值。

我怎样才能在Python中做到这一点？

-- 谢谢

原文

Groovy has a concept of GStrings. I can write code like this:

def greeting = 'Hello World'
println """This is my first program ${greeting}"""

I can access the value of a variable from within the String.

How can I do this in Python?

--
Thanks

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流星番茄 2024-07-25 03:22:58

在Python中，您必须显式传递可能变量的字典，您无法从字符串中访问任意“外部”变量。但是，您可以使用 locals() 函数返回包含本地范围内所有变量的字典。

对于实际的替换，有很多方法可以做到（多么不Python！）：

greeting = "Hello World"

# Use this in versions prior to 2.6:
print("My first programm; %(greeting)s" % locals())

# Since Python 2.6, the recommended example is:
print("My first program; {greeting}".format(**locals()))

# Works in 2.x and 3.x:
from string import Template
print(Template("My first programm; $greeting").substitute(locals()))

In Python, you have to explicitely pass a dictionary of possible variables, you cannot access arbitrary "outside" variables from within a string. But, you can use the locals() function that returns a dictionary with all variables of the local scope.

For the actual replacement, there are many ways to do it (how unpythonic!):

greeting = "Hello World"

# Use this in versions prior to 2.6:
print("My first programm; %(greeting)s" % locals())

# Since Python 2.6, the recommended example is:
print("My first program; {greeting}".format(**locals()))

# Works in 2.x and 3.x:
from string import Template
print(Template("My first programm; $greeting").substitute(locals()))

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暮凉 2024-07-25 03:22:58

d = {'greeting': 'Hello World'}
print "This is my first program %(greeting)s" % d

d = {'greeting': 'Hello World'}
print "This is my first program %(greeting)s" % d

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我三岁 2024-07-25 03:22:58

在 Python 2.6+ 中，您可以执行以下操作：

"My name is {0}".format('Fred')

查看 PEP 3101。

In Python 2.6+ you can do:

"My name is {0}".format('Fred')

Check out PEP 3101.

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慕烟庭风 2024-07-25 03:22:58

你不能完全...

我认为你真正能得到的最接近的是使用标准的基于%的替换，例如：

greeting = "Hello World"
print "This is my first program %s" % greeting

话虽如此，从Python 2.6开始有一些奇特的新类可以通过不同的方式做到这一点：查看2.6 的字符串文档，特别是从第 8.1.2 节开始，以了解更多信息。

You can't exactly...

I think the closest you can really get is using standard %-based substitution, e.g:

greeting = "Hello World"
print "This is my first program %s" % greeting

Having said that, there are some fancy new classes as of Python 2.6 which can do this in different ways: check out the string documentation for 2.6, specifically from section 8.1.2 onwards to find out more.

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