Question

酒店销售人员在文本文件中输入销售。每行包含以下内容，以分号分隔：客户的名称，销售的服务（如晚餐，会议，住宿等），销售金额以及该事件的日期。编写一个读取此类文件的程序，并显示每个服务类别的总金额。

显示错误

我的文字文件包含

Bob;Dinner;10.00;January 1, 2015
Tom;Dinner;14.00;January 2, 2015
Anne;Lodging;125.00;January 3, 2015
Jerry;Lodging;125.00;January 4, 2015

所以这是我的代码到目前为止

def main():
    file_name = input("Input file name: ")
    amount_by_category = process_file(file_name)
    if amount_by_category:
        print 'Totals:'
        for key in amount_by_category:
            print '{0}: $ {1}'.format(key, amount_by_category.get(key) )

def process_file(file_name):
    infile = open(file_name, 'r')
    # a dictionary mapping category to total amount for that category
    amount_by_category = {}
    for line in infile:
        fields = line.split(';')
        if len(fields) != 4:
            raise Exception('Expected 4 fields but found %s' % len(fields))
        value = float(fields[2])
        category = fields[1]
        if not category in amount_by_category:
            amount_by_category[category] = 0.0
        amount_by_category[category] += value
    return amount_by_category

main()

我收到语法错误，不知道原因。

追溯：

Traceback (most recent call last): 
File "C:\Users\Brandon\Desktop\Assignment 7\girrrr.py", 
line 24, in <module> main() File "C:\Users\Brandon\Desktop\Assignment 7\girrrr.py", 
line 7, in main print ('{0}: $ {1}').format(key, amount_by_category.get(key) ) 
AttributeError: 'NoneType' object has no attribute 'format'

Answer 1

看起来你正在使用一个旧的python，但这个代码在3.6中运行得很好：

def main():
    file_name = input("Input file name: ")
    amount_by_category = process_file(file_name)
    if amount_by_category:
        print ("Totals:")
        for key in amount_by_category:
            print ("{}: $ {}".format(key, amount_by_category.get(key)))

def process_file(file_name):
    infile = open(file_name, 'r')
    # a dictionary mapping category to total amount for that category
    amount_by_category = {}
    for line in infile:
        fields = line.split(';')
        if len(fields) != 4:
            raise Exception('Expected 4 fields but found %s' % len(fields))
        value = float(fields[2])
        category = fields[1]
        if not category in amount_by_category:
            amount_by_category[category] = 0.0
        amount_by_category[category] += value
    return amount_by_category

main()

Answer 2

您共享的回溯如下所示：

Option Explicit

Public Shp As Shape

Sub Bubble2()

' set object reference to new created Shape
Set Shp = ActiveSheet.Shapes.AddShape(msoShapeCloudCallout, 795, 8.25, 107.25, 41.25)

With Shp
    .Name = "zooky"
    .Adjustments.Item(1) = -0.25029
    .TextFrame2.TextRange.Characters.Text = "text.................."
End With

With Shp.TextFrame2.TextRange.Characters(1, 10)
    With .ParagraphFormat
        .FirstLineIndent = 0
        .Alignment = msoAlignLeft
    End With
    With .Font
        .NameComplexScript = "+mn-cs"
        .NameFarEast = "+mn-ea"
        .Fill.Visible = msoTrue
        .Fill.ForeColor.ObjectThemeColor = msoThemeColorLight1
        .Fill.ForeColor.TintAndShade = 0
        .Fill.ForeColor.Brightness = 0
        .Fill.Transparency = 0
        .Fill.Solid
        .Size = 11
        .Name = "+mn-lt"
    End With
End With

Range("P5").Select

' just for testing
'Call FlipFlop2

End Sub

Sub FlipFlop2()
    With Shp
        .Visible = Not .Visible
    End With
End Sub

，而您的代码如下所示：

print ('{0}: $ {1}').format(key, amount_by_category.get(key) )

我尝试运行你的代码，运行正常。尝试重新运行代码，它应该可以工作。

在Python中读取文本文件并从中选择类别？旅馆

2 个答案: