追加是在程序中多次调用时带来语法错误

Question

I am trying to program a simple function. It is a function that takes on different forms depending on the value of proton numbers provided.

The proton numbers are provided in the list called "Z_min."

What I need to do is to calculate the function and store the values in an array so I can plot the values later.

I am a bit rusty in Python, but the way I am trying to store the computed values is by using .append to add it to a list in my python program, but this keeps bringing back a syntax error whenever .append is called more than once inside the for loop. However, the way the loop is constructed, .append should only be called once in the body of the loop in a single iteration.

Can you please help me figure out why this happening?

import math as m
import matplotlib.pyplot as plt
import numpy as np

a_V = 15.75
a_S = 17.8
a_C = 0.711
a_A = 23.695
a_P = 11.2

Z_min = []
A = []
BA = []

for A_idx in range(0,301):
    Z_min_val = (A_idx/2) * (1 +(a_C/(4*a_A))*A_idx**(2/3))**(-1)
    A.append(A_idx)
    Z_min.append(round(Z_min_val))


for i in Z_min:
    if (A[i]%2 == 0):
        if (Z_min[i]%2) == 0:
            #print("This is even: ", Z_min[i])
            if (A[i] == 0):
                BA_val = 0
                BA.append(BA_val)
            else:
                BA_val = (a_V*A[i] - a_S*(A[i])**(2/3) - a_C*(Z_min[i](Z_min[i]-1))/((A[i])**(1/3)) - a_A((A[i]-2*Z_min[i])**2)/(A[i]) + a_P*(A[i])**(-1/2))
                BA.append(BA_val)
        else:
            #print("This is odd: ", Z_min[i])
            BA_val = (a_V*A[i] - a_S*(A[i])**(2/3) - a_C*(Z_min[i](Z_min[i]-1))/((A[i])**(1/3)) - a_A((A[i]-2*Z_min[i])**2)/(A[i]) - a_P*(A[i])**(-1/2))
            BA.append(BA_val)
    else:
        B_by_A_val = (a_V*A[i] - a_S*(A[i])**(2/3) - a_C*(Z_min[i](Z_min[i]-1))/((A[i])**(1/3)) - a_A((A[i]-2*Z_min[i])**2)/(A[i]))
        B_by_A.append(B_by_A_val)

Answer 1

I'm guessing that probably you might want to use * in a few places:

import math as m
import matplotlib.pyplot as plt
import numpy as np

a_V = 15.75
a_S = 17.8
a_C = 0.711
a_A = 23.695
a_P = 11.2

Z_min = []
A = []
BA = []
B_by_A = []

for A_idx in range(0,301):
    Z_min_val = (A_idx/2) * (1 +(a_C/(4*a_A))*A_idx**(2/3))**(-1)
    A.append(A_idx)
    Z_min.append(round(Z_min_val))


for i in Z_min:
    if (A[i]%2 == 0):
        if (Z_min[i]%2) == 0:
            #print("This is even: ", Z_min[i])
            if (A[i] == 0):
                BA_val = 0
                BA.append(BA_val)
            else:
                BA_val = (a_V*A[i] - a_S*(A[i])**(2/3) - a_C*(Z_min[i]*(Z_min[i]-1))/((A[i])**(1/3)) - a_A*((A[i]-2*Z_min[i])**2)/(A[i]) + a_P*(A[i])**(-1/2))
                BA.append(BA_val)
        else:
            #print("This is odd: ", Z_min[i])
            BA_val = (a_V*A[i] - a_S*(A[i])**(2/3) - a_C*(Z_min[i]*(Z_min[i]-1))/((A[i])**(1/3)) - a_A*((A[i]-2*Z_min[i])**2)/(A[i]) - a_P*(A[i])**(-1/2))
            BA.append(BA_val)
    else:
        B_by_A_val = (a_V*A[i] - a_S*(A[i])**(2/3) - a_C*(Z_min[i]*(Z_min[i]-1))/((A[i])**(1/3)) - a_A*((A[i]-2*Z_min[i])**2)/(A[i]))
        B_by_A.append(B_by_A_val)