从函数外返回列表集：python

方法

collectInfoFromXLS（）

从给定的XLS文件中提取

引号（“”）

下的所有内容，并放入

列表中

class ExtractInfo(object):

    def collectInfoFromXLS():
        workbookPath = config.get('TestCaseFileURL','XLSpath')
        workbook = xlrd.open_workbook(workbookPath)
        SheetPath = config.get('TesCaseSheetName','Sheet1')
        worksheet = workbook.sheet_by_name(SheetPath)
        numOfRows = worksheet.nrows - 1
        curr_row = 0
        row1 = []
        row2 = []
        while curr_row < numOfRows:
           curr_row += 1
           row2 = []
           row = worksheet.row(curr_row)
           for value2 in re.findall(r"'(.*?)'", str(row)):
                row2.append(value2)
           return row2

我想从类外调用这个方法，比如

Classobject = ExtractInfo(object)
print Classobject.collectInfoFromXLS()

这样我就可以得到每一行，就像
print
inside方法一样，
我不想将
rows2
追加到另一个列表中，因为这会在检索时产生问题。
Python方法一次只能返回一个结果

一个结果可以是列表的列表；只需返回一个较大的列表，并循环返回结果：

result = []
row2 = []
while curr_row < numOfRows:
   curr_row += 1
   row2 = []
   row = worksheet.row(curr_row)
   for value2 in re.findall(r"'(.*?)'", str(row)):
        row2.append(value2)
   result.append(row2)
return result

一种更先进的技术是将您的方法转换为生成器函数，并逐个生成行。你仍然会重复这个方法。要使函数成为生成器，请使用
yield
表达式；一旦将值设置为生成器，就不能再使用
return
：

def collectInfoFromXLS():
    workbookPath = config.get('TestCaseFileURL','XLSpath')
    workbook = xlrd.open_workbook(workbookPath)
    SheetPath = config.get('TesCaseSheetName','Sheet1')
    worksheet = workbook.sheet_by_name(SheetPath)
    numOfRows = worksheet.nrows - 1
    curr_row = 0
    row2 = []
    while curr_row < numOfRows:
       curr_row += 1
       row2 = []
       row = worksheet.row(curr_row)
       for value2 in re.findall(r"'(.*?)'", str(row)):
            row2.append(value2)
       yield row2

现在才
Classobject.collectInfoFromXLS（）
返回一个生成器对象而不是列表，并且您只能在该对象上循环一次。
您的问题是什么？@DanielRoseman:他想神奇地返回列表序列而不创建序列。确切地说是@MartijnPieters
for row in Classobject.collectInfoFromXLS():
    print row

def collectInfoFromXLS():
    workbookPath = config.get('TestCaseFileURL','XLSpath')
    workbook = xlrd.open_workbook(workbookPath)
    SheetPath = config.get('TesCaseSheetName','Sheet1')
    worksheet = workbook.sheet_by_name(SheetPath)
    numOfRows = worksheet.nrows - 1
    curr_row = 0
    row2 = []
    while curr_row < numOfRows:
       curr_row += 1
       row2 = []
       row = worksheet.row(curr_row)
       for value2 in re.findall(r"'(.*?)'", str(row)):
            row2.append(value2)
       yield row2

for row in Classobject.collectInfoFromXLS():
    print row