从文件中读取列表，然后循环编写以求解数学方程式

Question

I have a list in a file that is made up of numbers.

I have a command to read the number in the list:

But I am having error:

TypeError: 'int' object is not subscriptable

Which I don't understand what 'int' is an issue.

with open('angles.txt', 'r') as f:
    print('Angle Sine         Cosine      Tangent')

    for number in f:
        degree= int(number)
        rad = math.radians(degree)
        sin = math.sin(rad)

        answer = degree[0]
        print(str(answer), end = '')

        print(format(math.sin(math.radians(rad)),'10.5f'),end='')
        print(format(math.cos(math.radians(rad)),'10.5f'),end='')
        print(format(math.tan(math.radians(rad)),'10.5f'),end='')

Answer 1

I can answer your specific question about the int type error. The problem is that these two lines don't make sense to python:

degree = int(number)

answer = degree[0]

You're first defining degree to be an integer, and then trying to access that integer like a list! That doesn't work.

Answer 2

Here is a somewhat cleaned-up version (this assumes a single angle per line):

import math

print('Angle         Sine     Cosine    Tangent')
with open('angles.txt') as f:
    for line in f:
        degrees = float(line)
        radians = math.radians(degrees)
        print(
            "{:5.1f}   {:10.5f} {:10.5f} {:10.5f}"
            .format(degrees, math.sin(radians), math.cos(radians), math.tan(radians))
        )

which produces something like:

Angle         Sine     Cosine    Tangent
  0.0      0.00000    1.00000    0.00000
 10.0      0.17365    0.98481    0.17633
 20.0      0.34202    0.93969    0.36397
 30.0      0.50000    0.86603    0.57735
 40.0      0.64279    0.76604    0.83910
 50.0      0.76604    0.64279    1.19175
 60.0      0.86603    0.50000    1.73205
 70.0      0.93969    0.34202    2.74748
 80.0      0.98481    0.17365    5.67128