Python TypeError: 不支持的操作数类型 -: 'unicode' 和 'unicode', coords
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TypeError: unsupported operand type(s) for -: 'unicode' and 'unicode', coords
提问by user1869558
full code is HERE
完整代码在这里
HTML code
HTML代码
<input type="hidden" id="Latitude" name="Latitude" value={{Longitude}} />
<input type="hidden" id="Longitude" name="Longitude" value={{Longitude}} />
document.getElementById("Latitude").value = position.coords.latitude;
document.getElementById("Longitude").value = position.coords.longitude;
app.py
应用程序
Latitude = request.form['Latitude']
Longitude = request.form['Longitude']
messages = database.returnMessagesinRange(float(Latitude),float(Longitude))
database.py
数据库.py
def returnMessagesinRange(longitude,latitude):
allMessages = Messages.find()
messagesinRange = []
for current in allMessages:
if ((current['longitude']-longitude) * (current['longitude']-longitude) + (current['latitude']-latitude)*(current['latitude']-latitude)) <= 1:
if messagesinRange == None:
messagesinRange = [current['text']]
else:
messagesinRange.append(current['text'])
return messagesinRange
When this is run, i get
当它运行时，我得到
if ((current['longitude']-longitude) * (current['longitude']-longitude) + (current['latitude']-latitude)*(current['latitude']-latitude)) <= 1:
TypeError: unsupported operand type(s) for -: 'unicode' and 'unicode'
Anyone know why this is happening? thanks.
有谁知道为什么会这样？谢谢。
采纳答案by asermax
Both the longitude and latitude retrieved from the request and the database are strings (unicode strings) and you are trying to operate on them as if they were numbers.
从请求和数据库中检索到的经度和纬度都是字符串（unicode 字符串），您正试图对它们进行操作，就好像它们是数字一样。
You should first get the intor floatrepresentation of such strings to be able to operate on them as numbers (using -, *, etc)
你应该先获得int或float这样的字符串的表示要能够对他们的数字操作（使用-，*等等）
You can do that by creating a intor floatobject passing the string as a parameter
您可以通过创建一个int或float对象将字符串作为参数传递来做到这一点
latitude = int(request.form['Latitude'])
or
或者
latitude = float(request.form['Latitude'])
回答by Eric
current['longitude']and longitudeare both unicodestrings. You need to convert them to floats if you plan to subtract them.
current['longitude']并且longitude都是unicode字符串。float如果您打算减去它们，则需要将它们转换为s。
回答by Paulo Scardine
Unlike in PHP, Python will not auto-convert from string to float. Use:
与 PHP 不同，Python 不会自动从字符串转换为浮点数。用：
errors = []
try:
latitude = float(request.form['Latitude'])
except ValueError:
# do something about invalid input
latitude = 0.0
errors.append(u"Invalid input for Latitude.")
回答by user1869558
ok we did this which works..
好的，我们这样做了，有效..
def returnMessagesinRange(longitude,latitude):
allMessages = Messages.find()
longitude = (eval(str(longitude)))
latitude = (eval(str(latitude)))
messagesinRange = []
for current in allMessages:
y=eval(str(current['longitude']))
x=eval(str(current['latitude']))
if ((longitude-x)*(longitude-x))+((latitude-y)*(latitude-y)) <= 1:
if messagesinRange == None:
messagesinRange = [str(current['text'].encode('ascii','ignore'))]
else:
messagesinRange.append(str(current['text'].encode('ascii','ignore')))
return messagesinRange
finally I can see the ending!
终于可以看到结局了！
