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我想從一個網頁使用燒瓶導入一個csv文件。我能夠從csv文件中導入數據並將數據作爲json返回。但是，我想僅打印數據中的第一個樣本。下面附上我的代碼和燒瓶錯誤。我正在使用的csv文件是csvfile。返回的JSON數據看起來像這樣Flask-Python從csv文件導入數據
{
"result": [
[
"0.011223",
"0.018274",
"0.071568",
"0.3407",
"0.50367",
"0.63498",
"0.45607",
"0.39945",
"0.27201",
"0.23569",
"0.29102",
"0.15327",
"0.095266",
"0.059091",
"0.014877",
"0.00010369",
"0.049384",
"0.12681",
"0.24325",
"0.30725",
"0.4259",
"0.56476",
"0.606",
"0.1001",
"0.5427",
"0.63342",
"0.62526",
"0.59211",
"0.59013",
"0.50669",
"0.42666",
"0.29487",
"0.20149",請諮詢什麼是錯的腳本。
`from flask import Flask, request, jsonify, render_template
from flask.ext import excel
import json, csv
app=Flask(__name__)
app.debug = True
@app.route("/upload", methods=['GET', 'POST'])
def upload_file():
if request.method == 'POST':
a= jsonify({"result": request.get_array(field_name='file')})
entries = json.loads(a)
entry=entries['result'][0]
return "<h2>'entry=%f'</h2>"%entry
return '''
<!doctype html>
<title>Upload an excel file</title>
<h1>Excel file upload (csv, tsv, csvz, tsvz only)</h1>
<form action="" method=post enctype=multipart/form-data><p>
<input type=file name=file><input type=submit value=Upload>
</form>
'''
if __name__ == "__main__":
app.run()`
TypeError
TypeError: expected string or buffer
Traceback (most recent call last)
File "C:\Users\Vikrant\Desktop\Flask1\chap1\lib\site-packages\flask\app.py", line 1836, in __call__
return self.wsgi_app(environ, start_response)
File "C:\Users\Vikrant\Desktop\Flask1\chap1\lib\site-packages\flask\app.py", line 1820, in wsgi_app
response = self.make_response(self.handle_exception(e))
File "C:\Users\Vikrant\Desktop\Flask1\chap1\lib\site-packages\flask\app.py", line 1403, in handle_exception
reraise(exc_type, exc_value, tb)
File "C:\Users\Vikrant\Desktop\Flask1\chap1\lib\site-packages\flask\app.py", line 1817, in wsgi_app
response = self.full_dispatch_request()
File "C:\Users\Vikrant\Desktop\Flask1\chap1\lib\site-packages\flask\app.py", line 1477, in full_dispatch_request
rv = self.handle_user_exception(e)
File "C:\Users\Vikrant\Desktop\Flask1\chap1\lib\site-packages\flask\app.py", line 1381, in handle_user_exception
reraise(exc_type, exc_value, tb)
File "C:\Users\Vikrant\Desktop\Flask1\chap1\lib\site-packages\flask\app.py", line 1475, in full_dispatch_request
rv = self.dispatch_request()
File "C:\Users\Vikrant\Desktop\Flask1\chap1\lib\site-packages\flask\app.py", line 1461, in dispatch_request
return self.view_functions[rule.endpoint](**req.view_args)
File "C:\Users\Vikrant\Desktop\Flask1\Flaskr\flaskr_t2.py", line 12, in upload_file
entries = json.loads(a)
File "c:\python27\Lib\json\__init__.py", line 339, in loads
return _default_decoder.decode(s)
File "c:\python27\Lib\json\decoder.py", line 364, in decode
obj, end = self.raw_decode(s, idx=_w(s, 0).end())
TypeError: expected string or buffer
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