Question

我有一个平均降雨量的代码，我一直试图通过用户输入每月的降雨来计算出来。但是我一直收到这个错误代码：

const CourseSchema = new Schema({
  _id: { type: String },
});

CourseSchema.virtual('sections', {
  type: Schema.Types.String,
  ref: 'Section',
  localField: 'sectionIds',
  foreignField: '_id',
  justOne: false,
});

CourseSchema.statics.findSections = function(id) {
  return this.findById(id)
    .populate('sections')
    .then(course => course.sections);
}


const SectionSchema = new Schema({
  _id: { type: String },
});

SectionSchema.virtual('course', {
  type: Schema.Types.String,
  ref: 'Course',
  localField: 'courseId',
  foreignField: '_id',
  justOne: true,
});

谁能告诉我它有什么问题？

  File "/Users/brittneybutcher/Desktop/UM-Flint/Average Rainfall.py", line 17, in <module>
    "Average rainfall: " + format( averagerainfall, ".2f" ) )
TypeError: bad operand type for unary +: 'str' "

Answer 1

在倒数第二行，您同时拥有+和,。最终的印刷声明应为：

print( "Number of Months: " + format( totalnumberofmonths, "d"), "Total inches of rainfall: " \
       + format( totalinchesofrainfall, ".2f" ), \
       "Average rainfall: " + format( averagerainfall, ".2f" ) )

Answer 2

看起来你有额外的＆＃39; +＆＃39;在print语句的倒数第二行。我建议打破各个组件的格式，使其更具可读性。

以下内容应该有效：

monthStr = format( totalnumberofmonths, "d")
inchStr = format(totalinchesofrainfall, ".2f")
avgStr = format( averagerainfall, ".2f" ) 
print("Number of months: {0}\tTotal inches: {1}\tAverage rainfall: {2}".format(monthStr, inchStr, avgStr))

Python-平均降雨量

2 个答案: