使用Python將字典打印為CSV文件

Question

我想將字典TimeSheet打印到我的CSV文件中。 但是，它僅將最后一行寫入我的CSV文件。 我怎樣才能解決這個問題？ 我可以在控制台中從TimeSheet打印所有內容，但不是所有的字典都可以打印為CSV。

import glob
import openpyxl
import csv
#loops through .xlsx files in folder path
path = 'C:/ExcelFolder/*.xlsx'
files = glob.glob(path)
for file in files:
    #selects specific cells in title sheet.
    wb = openpyxl.load_workbook(file)
    sheet = wb.get_sheet_by_name('Sheet2')
    Week = sheet.cell(row=1, column=1).value
    Date = sheet.cell(row=2, column=1).value
    Name = sheet.cell(row=4, column=2).value
    Title = sheet.cell(row=5, column=2).value
    Site = sheet.cell(row=6, column=2).value
    LocID = sheet.cell(row=7, column=2).value
    for n in range(2, 9):
        sheets = wb.worksheets[n]
        Days = wb.worksheets[n]
        for i in range(1, 57):
            From = sheets.cell(row=i, column=1).value
            To = sheets.cell(row=i, column=2).value
            Activity = sheets.cell(row=i, column=3).value
            TimeSheet = {'Week': Week, 'Date': Date, 'Name': Name, 'Title': Title, 'Site': Site, 'LocID': LocID, 'Days': Days, 'From': From, 'To': To, 'Activity': Activity}
            with open('TestOutput.csv', 'w') as csvfile:
                TimeSheet = {'Week': Week, 'Date': Date, 'Name': Name, 'Title': Title, 'Site': Site, 'LocID': LocID,
                             'Days': Days, 'From': From, 'To': To, 'Activity': Activity}
                fieldnames = ['Week', 'Date', 'Name', 'Title', 'Site', 'LocID', 'Days', 'From', 'To', 'Activity']
                writer = csv.DictWriter(csvfile, fieldnames=fieldnames)
                writer.writeheader()
                writer.writerow(
                    {'Week': Week, 'Date': Date, 'Name': Name, 'Title': Title, 'Site': Site, 'LocID': LocID, 'Days': Days, 'From': From, 'To': To, 'Activity': Activity})

                print(TimeSheet)

控制台輸出：

{'Site': 'moon LV-426', 'Activity': None, 'From': datetime.time(18, 45), 'Title': 'Private Hudson', 'Week': 'Week 3', 'To': datetime.time(19, 0), 'Days': <Worksheet "Saturday">, 'Name': 'Bill Paxton', 'Date': '2016/5/22-2016/5/28', 'LocID': '4220A'}
{'Site': 'moon LV-426', 'Activity': None, 'From': datetime.time(19, 0), 'Title': 'Private Hudson', 'Week': 'Week 3', 'To': datetime.time(19, 15), 'Days': <Worksheet "Saturday">, 'Name': 'Bill Paxton', 'Date': '2016/5/22-2016/5/28', 'LocID': '4220A'}
{'Site': 'moon LV-426', 'Activity': None, 'From': datetime.time(19, 15), 'Title': 'Private Hudson', 'Week': 'Week 3', 'To': datetime.time(19, 30), 'Days': <Worksheet "Saturday">, 'Name': 'Bill Paxton', 'Date': '2016/5/22-2016/5/28', 'LocID': '4220A'}
{'Site': 'moon LV-426', 'Activity': None, 'From': datetime.time(19, 30), 'Title': 'Private Hudson', 'Week': 'Week 3', 'To': datetime.time(19, 45), 'Days': <Worksheet "Saturday">, 'Name': 'Bill Paxton', 'Date': '2016/5/22-2016/5/28', 'LocID': '4220A'}

CSV輸出：

Answer 1

問題可能是您為每次迭代都重新創建了CSV文件。
當您移動包含CSV文件的創建文件時，它應該可以工作。 標題線從內循環出來像這樣：

import glob
import openpyxl
import csv

#loops through .xlsx files in folder path

with open('TestOutput.csv', 'w') as csvfile:
    fieldnames = ['Week', 'Date', 'Name', 'Title', 'Site', 'LocID', 'Days', 'From', 'To', 'Activity']
    writer = csv.DictWriter(csvfile, fieldnames=fieldnames)
    writer.writeheader()

    path = 'C:/ExcelFolder/*.xlsx'
    files = glob.glob(path)    
    for file in files:
        #selects specific cells in title sheet.
        wb = openpyxl.load_workbook(file)
        sheet = wb.get_sheet_by_name('Sheet2')
        Week = sheet.cell(row=1, column=1).value
        Date = sheet.cell(row=2, column=1).value
        Name = sheet.cell(row=4, column=2).value
        Title = sheet.cell(row=5, column=2).value
        Site = sheet.cell(row=6, column=2).value
        LocID = sheet.cell(row=7, column=2).value
        for n in range(2, 9):
            sheets = wb.worksheets[n]
            Days = wb.worksheets[n]
            for i in range(1, 57):
                From = sheets.cell(row=i, column=1).value
                To = sheets.cell(row=i, column=2).value
                Activity = sheets.cell(row=i, column=3).value
                TimeSheet = {'Week': Week, 'Date': Date, 'Name': Name, 'Title': Title, 'Site': Site, 'LocID': LocID, 'Days': Days, 'From': From, 'To': To, 'Activity': Activity}                                                     
                writer.writerow(
                    {'Week': Week, 'Date': Date, 'Name': Name, 'Title': Title, 'Site': Site, 'LocID': LocID, 'Days': Days, 'From': From, 'To': To, 'Activity': Activity})
                print(TimeSheet)

Answer 2

問題是，以“ w”模式為每一行打開了“ TestOutput.csv”，這將截斷文件（請參閱https://docs.python.org/3/library/functions.html#open ）。 它僅寫入最后一行，因為所有其他行均被刪除。

一目了然，您需要在遍歷文件列表之前將調用移至open（）和writeheader（）。

Answer 3

如之前的回復所述，請先創建CSV文件。

如果您希望單個csv合並excel文件中的所有數據，則DAXaholic的解決方案應該可以使用。

如果您希望每個excel文件都有一個csv文件，則以下內容可能會有所幫助：

import glob
import openpyxl
import csv
# loops through .xlsx files in folder path
path = 'C:/ExcelFolder/*.xlsx'
files = glob.glob(path)
fieldnames = ['Week', 'Date', 'Name', 'Title', 'Site', 'LocID', 'Days', 'From', 'To', 'Activity']
for file in files:
    # selects specific cells in title sheet.
    wb = openpyxl.load_workbook(file)
    sheet = wb.get_sheet_by_name('Sheet2')
    Week = sheet.cell(row=1, column=1).value
    Date = sheet.cell(row=2, column=1).value
    Name = sheet.cell(row=4, column=2).value
    Title = sheet.cell(row=5, column=2).value
    Site = sheet.cell(row=6, column=2).value
    LocID = sheet.cell(row=7, column=2).value

    # append the extension .csv to the current filename
    csvfilename = "{}.csv".format(file)
    with open(csvfilename, 'w') as csvfile:
        writer = csv.DictWriter(csvfile, fieldnames=fieldnames)
        writer.writeheader()
        for n in range(2, 9):
            sheets = wb.worksheets[n]
            Days = wb.worksheets[n]
            for i in range(1, 57):
                From = sheets.cell(row=i, column=1).value
                To = sheets.cell(row=i, column=2).value
                Activity = sheets.cell(row=i, column=3).value
                TimeSheet = {'Week': Week, 'Date': Date, 'Name': Name, 'Title': Title, 'Site': Site, 'LocID': LocID, 'Days': Days, 'From': From, 'To': To, 'Activity': Activity}
                writer.writerow(TimeSheet)
                print(TimeSheet)