removing double quote from json.dumps of string data

Question

I have some data that I'm retrieving from a data feed as text. For example, I receive the data like the following:

1105488000000, 34.1300, 34.5750, 32.0700, 32.2800\r\n
1105574400000, 32.6750, 32.9500, 31.6500, 32.7300\r\n
1105660800000, 36.8250, 37.2100, 34.8650, 34.9000\r\n

etc.

(This is stock data, where the first column is the timestamp, the next columns are the open, high, low, and close price for the time period.)

I want to convert this into a json such as the following:

[
[1105488000000, 34.1300, 34.5750, 32.0700, 32.2800], 
[1105574400000, 32.6750, 32.9500, 31.6500, 32.7300], 
[1105660800000, 36.8250, 37.2100, 34.8650, 34.9000],
...

The code that I'm using is:

  lines = data.split("\r\n");
  output = []
  for line in lines:
     currentLine = line.split(",")
     currentLine = [currentLine[0] , currentLine[1] , currentLine[2], currentLine[3], currentLine[4]]
     output.append(currentLine)


  jsonOutput = json.dumps(output)

However, when I do this, I'm finding that the values are:

[
["1105488000000", "34.1300", "34.5750", "32.0700", "32.2800"], 
["1105574400000", "32.6750", "32.9500", "31.6500", "32.7300"], 
["1105660800000", "36.8250", "37.2100", "34.8650", "34.9000"],

Is there anyway for me to get the output without the double quotes?

Answer 1

在输出之前将数据传递给int()或float()构造函数，以便将它们转换为数字 。

Answer 2

...
currentLine = [float(i) for i in currentLine]
output.append(currentLine)
...

Answer 3

Change

currentLine = [currentLine[0] , currentLine[1] , currentLine[2], currentLine[3], currentLine[4]]
output.append(currentLine)

to

currentData = map(lambda num: float(num.strip()) , currentLine)
output.append(currentData)

Whenever you initialize currentLine with

currentLine = line.split(",")

all the elements of currentLine are strings. So, whenever you write this to JSON, you get JSON strings throughout. By converting all the strings to numbers, you get something without quotes. Also, I added the strip() calls to handle leading and trailing whitespace as is shown in your data example.

PS Please don't use the same variable name for two completely different things. It's more clear to use currentLine for the list of strings, and currentData for the list of numbers.