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i have a lab for my computer science class and i can't seem to get it right.
we're required to import everything from math and to define functions for geometric shapes
ex:
def triangleArea(b,h):
return b * h / 2
for calling it, we need to make a menu to make the user choose what they want for these geometric shapes. for example, if you chose the number 2 and it gives you the volume of a cylinder.
i just can't seem to understand how you call the function inside the while/for loops.
thank uu~!
def find_area(width, height): # define function
return width * height
for i in range(10):
area = find_area(i, 10) #calls function 'find_area()' and saves returned
#value to variable area
print(area) # prints area
count = 0
while count < 10:
area = find_area(i, 10) #calls function 'find_area()' and save returned
#value to variable area
print(area)
count += 1
Example calling function find_area() from within a for-loop and while-loop.
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I have a variable which has an equation .I'm trying convert the equation that the varibale has into a string and compute the results
Eg
def func1(x):
y = x + 5
return y, 'x+5'
x as input can vary since I'm iterating
through multiple values
Say
h[0][1] = 5
func1(h[0][1])
Output - 10, "h[0][1]+5"
Required result
I need x+5 as string and the computed result of y as a while calling func1
Eval and exec seemed like a probable solution but they perform the inverse of what is needed
I'm not sure I understand why you'd want this but given that the variable holding the equation would be known when coding, you could just wrap the equation in a function. Eg:
def add_five(x):
return (x + 5, "x + 5")
x = 10
y = add_five(x)
print("Answer is", y[0])
print("Equation is", y[1])
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I'm trying to make an average but for some reason when I try to make one it doesn't work.
I have global variables and array defined at the begining of my document :
vent_moyenne_km = []
compteur_moyenne=0
I have one of my function that is called every X time. In that one, I calculate a velocity with some value that are display on a label of my interface. that part is working, but not the mean
global compteur_moyenne
compteur_moyenne += 1
ventkmh = (vent_1[3][0]*256 + vent_1[4][0]) /100 *3.6
label_vent2_2.config(text= "%.2f" % ventkmh)
vent_moyenne_km.append("%.2f" % ventkmh)
vent_1.clear()
if compteur_moyenne == 5:
compteur_moyenne = 0
print(vent_moyenne_km)
label_vent4_2.config(text=statistics.mean(vent_moyenne_km))
vent_moyenne_km.clear()
of course in my imports I have :
import statistics
When I comment the line label_vent4_2.config(text=statistics.mean(vent_moyenne_km)), everything works and I see in the terminal my array with 5 values. I also tried numpy and even tried to make a for items in array: then add then manually, and everytime I get the error : class 'IndexError'
I'm really not sure how to fix that.
For calculating an average of a list just use numpy:
def function():
value = random.randint(0,1)
return value
list = []
for i in range(100):
list.append(function())
if i%5 == 0:
print(np.average(list))
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Suppose I have a class called Cube and I create three objects:
class Cube():
def __init__(self, volume):
self.volume = volume
a = Cube(param_a)
b = Cube(param_b)
c = Cube(param_c)
I was wondering if I can write a function, to which the user can give a format, and the function can apply the format to the objects? For example:
>>> print_all(dummy_cube.volume)
a.volume
b.volume
c.volume
So basically the function contains a loop which will replace dummy_cube to a, b, c.
I know I can use something like getattr(), but it has limits. For example, I hope that the function can print whatever format the user gives:
>>> print_all( (dummy_cube.volume)**2 + 1 )
(a.volume)**2 + 1
(b.volume)**2 + 1
(c.volume)**2 + 1
Is there any good way to do this?
Edit: As the comments pointed out, yes the function can take a list, and I intend it to return the numerical values instead of the format itself.
With a list I can do like:
cube_list = [a, b, c]
for cube in cube_list:
print( (cube.volume)**2 + 1 )
But I am still not sure how I can do it with arbitrary expressions given by the user.
The user can supply a function.
def print_all(f):
for cube in cube_list:
print(f(cube))
import operator
print_all(operator.attrgetter('volume'))
print_all(lambda c: c.volume**2 + 1)
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This is my attempt to make the turtle stop after traveling nearly 400 pixels.
def race():
while True:
alex.forward(r_alex)
a = a + r_alex
if a > 399.9:
break
And this is what I got back
UnboundLocalError: local variable 'a' referenced before assignment
The line a = a + r_alex uses a before you actually define a.
I'm guessing a is the turtle's displacement so perhaps you should try the following:
def race():
a = 0
while True:
alex.forward(r_alex)
a += r_alex
if a > 399.9:
break
Even better:
def race():
a = 0
while(a > 399.9):
alex.forward(r_alex)
a += r_alex
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I have the following code:
p=3.14159
#Function to circleArea
def circleArea(A):
A=r*r*p
radius=r
return radius
#Main Program
r=int(input("Enter radius: "))
print("The area of the circle is:" )
print(circleArea(A))
Why does the line beneath yield this error?
print(circleArea(A))
NameError: name 'A' is not defined
It seems you want to return r*r*p from circleArea() function and pass r as an argument. Also, you may want to use math.pi instead of hardcoding it's value:
import math
#Function to circleArea
def circleArea(r):
return r * r * math.pi
#Main Program
r=int(input("Enter radius: "))
print("The area of the circle is:" )
print(circleArea(r))
DEMO:
Enter radius: 10
The area of the circle is:
314.159265359
In your function definition, A is just a local variable inside the function. The variable that you're wanting to pass in is actually called r. So, instead, you want:
print(circleArea(r))
You also want to change your function declaration to:
def circleArea(r):