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python - 我无法让我的代码执行用户输入选择的函数

问题描述

当运行我的程序并提供用户输入时，它只执行代码中的最后一个函数。我知道代码有什么问题，我正在用不同的参数重新定义同一个函数。但是，我不知道如何更改它，以便代码运行与用户输入匹配的函数。这是我为该程序编写的代码。

import math
from math import pi


def equation(Lift):
  d = float(input("Input d value: "))
  v = float(input("Input v value: "))
  A = float(input("Input A value: "))
  CL = float(input("Input CL value: "))

  Lift = .5 * d * (v ** 2) * A * CL 

  a = ["Lift = ", Lift, "Newtons"]
  for i in range (3):
    print(a[i], end =" ")

def equation(VCylinder):
  r = float(input("Input r value: "))
  h = float(input("Input h value: "))

  VCylinder = pi * (r ** 2) * h

  a = ["Volume of Cylinder =", VCylinder, "m³ (meters³)"]
  for i in range(3):
    print(a[i], end =" ")

def equation(Exponentdx):
  n = int(input("Input n value: "))

  u = n
  v = n - 1

  a = ["dx =", u,"x","**", v, " "]
  for i in range(5):
    print(a[i], end =" ")


def Main():
  print("Currently only compatible with base metric units (meters, 
kilograms, etc.)")
  Equation = input("Enter desired equation: ")
  equation(Equation)

Main()

标签： python

解决方案

您需要给每个方程函数一个唯一的名称。这将允许您构建一个字典，将标识符映射到每个字典。此外，您需要获取一个参数值以在调用所选函数之前传递它。

这是一个做所有这些事情的例子：

import math
from math import pi


def equation1(Lift):
  d = float(input("Input d value: "))
  v = float(input("Input v value: "))
  A = float(input("Input A value: "))
  CL = float(input("Input CL value: "))

  Lift = .5 * d * (v ** 2) * A * CL

  a = ["Lift = ", Lift, "Newtons"]
  for i in range (3):
    print(a[i], end =" ")

def equation2(VCylinder):
  r = float(input("Input r value: "))
  h = float(input("Input h value: "))

  VCylinder = pi * (r ** 2) * h

  a = ["Volume of Cylinder =", VCylinder, "m³ (meters³)"]
  for i in range(3):
    print(a[i], end =" ")

def equation3(Exponentdx):
  n = int(input("Input n value: "))

  u = n
  v = n - 1

  a = ["dx =", u,"x","**", v, " "]
  for i in range(5):
    print(a[i], end =" ")

# Build dictionary mapping an equation identifer to equation functions.
equations = {
    '1': equation1,
    '2': equation2,
    '3': equation3,
}

def Main():
  print("Currently only compatible with base metric units (meters, kilograms, etc.)")
  eq_id = input("Enter desired equation function (1, 2, or 3): ")
  eq_arg = float(input("Enter value of argument to pass equation function: "))
  equations[eq_id](eq_arg)  # Call selected equation with argument.

Main()

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