對函數感到困惑

Question

所以我目前正在為我的 python 編碼 class 做一個作業，我必須得到一個圓柱體的面積，我應該使用函數，所以它看起來更干凈，但我不太確定如何准確地完成我的作業從頭開始，我看了很多視頻，但似乎無法真正理解函數，我的代碼目前看起來像這樣，但是每當我運行我的代碼時，我都無法讓“def calc():”部分運行，請問我可以得到一些指示嗎？

def info():
    r = float(input("What is the radius of the cylinder? "))
    h = float(input("What is the height of the cylinder? "))
    print("The cylinders area is", area)

def calc():
    pi = 22/7
    area = ((2*pi*r) * h) + ((pi*r**2)*2)
    return pi, area

info()

Answer 1

不需要那么多funcatin。

def info():
    r = float(input("What is the radius of the cylinder? "))
    h = float(input("What is the height of the cylinder? "))
    calc(r,h)
    

def calc(r,h):
    pi = 22/7
    area = ((2*pi*r) * h) + ((pi*r**2)*2)
    print("The cylinders area is", area)
    

info()

Answer 2

在這種情況下，我將半徑設置為 3，將高度設置為 6。您需要定義變量。 然后它應該工作。 在這種情況下，我使用 numpy 來導入精確的 pi 變量。

Answer 3

您必須將calc() function 放在info() function 上方。 您必須實際調用calc() function 它將返回圓柱體的面積。 我提供了下面的代碼，應該可以解決您的問題。 希望你看懂代碼！

def calc(r, h): # Calculates the area of cylinder
    pi = 22/7
    area = ((2*pi*r) * h) + ((pi*r**2)*2)
    return area

def info(): # Takes the radius and height from user.
       r = float(input("What is the radius of the cylinder? "))
       h = float(input("What is the height of the cylinder? "))
       
       return f"The area is {calc(r, h)}"
 
# r = 5
# h = 10   
print(info())

# using parameters in functions instead of inputs:

def info2(r, h):
    return f"The area is {calc(r, h)}"

r = 5
h = 10 
print(info2(r, h))

# Comparing areas of cylinders

area1 = calc(5, 10)
area2 = calc(10, 15)

if area1>area2: #Area1 is greater than Area2
    print("Area1 is greater than Area2")
elif area2>area1: #Area2 is greater than Area1
    print("Area2 is greater than Area1")
else: #Both are equal
    print("Both are equal")

Answer 4

您在評論中提到您想要輸入多個氣缸並確定哪個是較大的——我認為您希望讓輸入氣缸的 function 返回氣缸本身，以便可以使用體積 function 進行比較。

from dataclasses import dataclass
from math import pi


@dataclass
class Cylinder:
    radius: float
    height: float
    name: str


def volume(c: Cylinder) -> float:
    return (2*pi*c.radius) * c.height + (pi*c.radius**2)*2


def input_cylinder(name: str) -> Cylinder:
    r = float(input(f"What is the radius of the {name} cylinder? "))
    h = float(input(f"What is the height of the {name} cylinder? "))
    return Cylinder(r, h, name)


if __name__ == '__main__':
    cylinders = [input_cylinder(name) for name in ('first', 'second')]
    for c in cylinders:
        print(f"The {c.name} cylinder's volume is {volume(c)}")
    print(f"The bigger cylinder is the {max(cylinders, key=volume).name} one.")