使用双引号而不是单引号返回 Python 列表中的变量
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Return a variable in a Python list with double quotes instead of single
提问by umbe1987
I am trying to return a variable from a list of strings in double quotes rather than single.
我试图从双引号而不是单引号中的字符串列表中返回一个变量。
For example, if my list is
例如，如果我的清单是
List = ["A", "B"]
if I type List[0]the output is 'A'. Rather, I want "A". Is there a way to do that? I need this because of an external script that runs in ArcGIS, which accepts only variables within double quotes.
如果我输入List[0]输出是'A'. 相反，我想要"A". 有没有办法做到这一点？我需要这个是因为在 ArcGIS 中运行的外部脚本只接受双引号内的变量。
回答by Will Vousden
If you need the output formatted in a particular way, use something like str.format():
如果您需要以特定方式格式化输出，请使用以下内容str.format()：
>>> print('"{0}"'.format(List[0]))
"A"
The quotes you used to define the strings in the list are forgotten by Python as soon as the line is parsed. If you want to emit a string with quotes around it, you have to do it yourself.
一旦解析该行，Python 就会忘记用于定义列表中字符串的引号。如果你想发出一个带引号的字符串，你必须自己做。
What you're seeing is the Python interpreter displaying a string representation of the value of the expression. Specifically, if you type an expression into the interpreter that doesn't evaluate to None, it will call repron the result in order to generate a string representation that it can display. For a string, this includes single quotes.
您看到的是 Python 解释器显示表达式值的字符串表示形式。具体来说，如果您在解释器中键入一个不计算为 的表达式None，它将调用repr结果以生成它可以显示的字符串表示。对于字符串，这包括单引号。
The interactive interpreter is essentially doing something like this each time you type in an expression (called, say, expr):
每次输入表达式（例如，称为 ）时，交互式解释器本质上都会执行以下操作expr：
result = expr
if result is not None:
print(repr(result))
Note that my example, printreturns None, so the interpreter itself doesn't print anything. Meanwhile, the printfunction outputs the string itself, bypassing the logic above.
请注意，我的示例print返回None，因此解释器本身不打印任何内容。同时，该print函数输出字符串本身，绕过上述逻辑。
回答by fn.
You could use json.dumps()
你可以使用json.dumps()
>>> import json
>>> List = ["A", "B"]
>>> print json.dumps(List)
["A", "B"]
