Question

Im writing a simulation of firing a canon in python, i get the error:

Traceback (most recent call last):
  File "C:\Users\Casper\Desktop\Skole\Dropbox\Skråkast\det_skraa_kast.py", line 47, in <module>
    float(speed)
AttributeError: Entry instance has no attribute '__float__'

My code (sorry for danish callnames :-):

#==LabelFrame==#

labelframe = LabelFrame(master, text="Parametre for affyring", bd = 3, font=("Aeria", "8", "bold"))
labelframe.pack(side = BOTTOM, expand="yes", fill="both")




#--Indtastning af fart--#

speedlabel = Label(labelframe, text="Indtast farten af kuglen", font=("Aeria", "8", "bold"))
speedlabel.pack(side = TOP)
speed = Entry(labelframe, bd = 3)
speed.pack(side = TOP)
float(speed)




#--Indtasning af vinkel--#

anglelabel = Label(labelframe, text="Indtast vinklen af kanonen", font=("Aeria", "8", "bold"))
anglelabel.pack(side = TOP)
angle = Entry(labelframe, bd = 3)
angle.pack()
float(angle)


... code creating a coordinate system ...




#==Update knap==#

def update(event=None):

        speedentry = speed.get()
        angleentry = angle.get()

Really hope you can help me 🙂

Best regards, Casper

p.s Might be notable to say im running 2.7.3 (demanded by my teacher)

Answer 1

the Entry object is not cenvertible to float, but its value probably is. (I’m guessing you’re using Tkinter.) Try this:

float(speed.get())

#...

float(angle.get())