Question

我试图制作一个程序来计算错过课程的费用。我接受一个学期的变量学费，课程数和周数;然后绘制结果（使用python 2.7）。这是我一直在努力的代码：

import matplotlib.pyplot as plot

def calculations(t, c, w, wk):

    two_week = (((t/c)/w)/2)*wk
    three_week = (((t/c)/w)/3)*wk
    return two_week, three_week

def main():
    tuition = float(raw_input('Tuition cost (not including fees): '))
    courses = int(raw_input('Number of courses: '))
    weeks = int(raw_input('Number of weeks in the semester: '))
    x_axis = range(0,10)
    y_axis = []
    y_axis2 = []
    for week in x_axis:
        cost_two, cost_three = calculations(tuition, courses, weeks, week)
        y_axis += [cost_two]
        y_axis2 += [cost_three]

    plot.plot(x_axis, y_axis ,marker='o', label='course meets 2x a week', color='b')
    plot.plot(x_axis, y_axis2,marker='o', label='course meets 3x a week', color='g')
    plot.xlabel('number of missed classes')
    plot.ylabel('cost ($)')
    plot.title('Tuition: %.2f Courses: %d Weeks in a semester: %d\n Created by <MyName>') %(tuition, courses, weeks)
    plot.legend()
    plot.xticks(x_axis)
    plot.xlim(0,x_axis[-1]+1)
    plot.yticks(y_axis)
    plot.ylim(0, y_axis[0]+1)
    plot.grid()
    plot.show()
    plot.savefig('missing-class-cost.pdf')

main()

但是，每当我运行程序时，都会收到以下错误：

Traceback (most recent call last):
  File "C:\Program Files (x86)\Wing IDE 101 4.1\src\debug\tserver\_sandbox.py", line 36,     in <module>
  File "C:\Program Files (x86)\Wing IDE 101 4.1\src\debug\tserver\_sandbox.py", line 26, in main
TypeError: unsupported operand type(s) for %: 'Text' and 'tuple'

第26行是参考这行代码：

plot.title('Tuition: %.2f Courses: %d Weeks in a semester: %d\n Created by <MyName>') %(tuition, courses, weeks)

由于某些数学原因我假设它，但我没有在整个程序中使用元组，所以我有点不知所措。

感谢任何帮助，谢谢。

Answer 1

你的括号在错误的地方。你可能想要

plot.title('Tuition: [...]' %(tuition, courses, weeks))

代替。现在，你正在做

plot.title('Tuition: [...]') %(tuition, courses, weeks)

因此，您正在调用plot.title，这会返回Text个对象，然后您尝试在此处调用%，这会产生错误讯息：

TypeError: unsupported operand type(s) for %: 'Text' and 'tuple'

希望现在更有意义。即使你说'＃34;我在整个程序中都没有使用元组＆＃34;，这正是(tuition, courses, weeks)的所在。

TypeError：％支持的操作数类型：＆＃39;文本＆＃39;和＆＃39;元组＆＃39;

1 个答案: