如何使用python从JSON文件中解开数组？

Question

I have the following JSON:

{u'messagetype': u'writefft', u'fftData': [[0, 1, 2, 1, 2, 4, 1, 0]]}

How can I unwrap this so I can print each data of the array 'fftData'?

Tried:

data = json.loads(request.body)
fftData = (data["fftData"])
print (data["fftData"])

But I doesn't achiev what I need...

• What this prints:
• [[0, 1, 2, 1, 2, 4, 1, 0]]
• What I want to print:

• 0, 1, 2, 1, 2, 4, 1, 0

• Tried: print (fftData[0])

• Put it prints:[0, 1, 2, 1, 2, 4, 1, 0]

Can someone help me?

Answer 1

[[0, 1, 2, 1, 2, 4, 1, 0]] is a list with a list as its first element.

Instead, extract the inner list out by:

fftData = data["fftData"][0]

which will now print [0, 1, 2, 1, 2, 4, 1, 0]

Then, to print out your list, I'd just convert it to a string, then remove the first and last characters by slicing the string.

print(str(fftData)[1:-1])

Answer 2

The correct way:

print(', '.join(str(i) for i in data["fftData"][0]))

The sneaky way:

print(str(data["fftData"]).strip('[]'))

Answer 3

for value in data["fftData"][0]:
    print(value)