使用Python生成一个C字符串的JSON文字 [英] using Python to generate a C string literal of JSON
问题描述
>>> import json
>>> mydict = {'a':1,'b':'一个带引号和\t和\\backslashes的字符串}
>>> json.dumps(mydict)
'{a:1,b:带有\\quotes \\的字符串,\\t和\\\ \\'backslashes}'
>>> print(json.dumps(mydict))
{a:1,b:具有\quotes \和\t和\\backslashes的字符串}
我需要生成的是以下C字符串:
{\a\:1,\b\:\带\\\\的引号\\\ \\和\\t和\\\\\backslashes\}
<换句话说,我需要在调用json.dumps(mydict)的结果上转义反斜杠和双引号。至少我以为我会....以下的工作?还是我错过了一个明显的角落?
>>> s ='''+ json.dumps(mydict).replace('\\','\\\\\'')replace('''''\\'')+' '
>>>打印s
{\a\:1,\b\:\一个带\\\quotes \\\的字符串,\ \t和\\\\\backslashes\}
AC字符串以引号开头,以引号结尾,没有嵌入的空值,所有嵌入的引号都以反斜杠转义,所有嵌入的反斜杠文字都翻倍。
所以拿你的字符串,加上反斜杠,并用反斜杠转义引号。我想你的代码正是你所需要的:
s =''+ json.dumps(mydict) \\',r'\\\'')替换(''',''''''''''
或者,您可以选择稍微不太强大的版本:
def c_string s)
pre>
all_chars =(chr(x)for x in range(256))
trans_table = dict((c,c)for all in all_chars)
trans_table.update({' ':r'\'','\\':r'\\'})
return.join(c中的c为c)
def dwarf_string(d):
import json
return''+ c_string(json.dumps(d))+''
我喜欢使用
string.maketrans()
,但翻译表可以将一个字符映射到最单一的角色。I have a dictionary in Python that I would like to serialize in JSON and convert to a proper C string so that it contains a valid JSON string that corresponds to my input dictionary. I'm using the result to autogenerate a line in a C source file. Got it? Here's an example:
>>> import json >>> mydict = {'a':1, 'b': 'a string with "quotes" and \t and \\backslashes'} >>> json.dumps(mydict) '{"a": 1, "b": "a string with \\"quotes\\" and \\t and \\\\backslashes"}' >>> print(json.dumps(mydict)) {"a": 1, "b": "a string with \"quotes\" and \t and \\backslashes"}
What I need to generate is the following C string:
"{\"a\": 1, \"b\": \"a string with \\\"quotes\\\" and \\t and \\\\backslashes\"}"
In other words, I need to escape the backslash and double-quote on the result of calling json.dumps(mydict). At least I think I do.... Will the following work? Or am I missing an obvious corner case?
>>> s = '"'+json.dumps(mydict).replace('\\','\\\\').replace('"','\\"')+'"' >>> print s "{\"a\": 1, \"b\": \"a string with \\\"quotes\\\" and \\t and \\\\backslashes\"}"
解决方案A C string starts with a quote and ends with a quote, has no embedded nulls, has all embedded quotes escaped with backslash, and all embedded backslash literals are doubled.
So take your string, double the backslashes and escape the quotes with a backslash. I think your code is exactly what you need:
s = '"' + json.dumps(mydict).replace('\\', r'\\').replace('"', r'\"') + '"'
Alternatively, you could go for this slightly less robust version:
def c_string(s): all_chars = (chr(x) for x in range(256)) trans_table = dict((c, c) for c in all_chars) trans_table.update({'"': r'\"', '\\': r'\\'}) return "".join(trans_table[c] for c in s) def dwarf_string(d): import json return '"' + c_string(json.dumps(d)) + '"'
I'd love to use
string.maketrans()
but a translation table can map a character to at most a single character.这篇关于使用Python生成一个C字符串的JSON文字的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!