strftime函数熊猫 - Python

Question

我试图从数据框写入Excel的日期中去掉时间，但一直不成功。

奇怪的是，我可以通过使用下面的lambda和striptime函数来操作数据框，并且可以看到它的功能正在工作，我的print df6。

但是，由于某些原因，当我打开Excel文件时，它显示格式为%m%d%y: 12:00am。我想只有日期显示。想法？

这里是我的代码：

df6 = df 
workbook = writer.book 
df6.to_excel(writer, sheet_name= 'Frogs', startrow= 4, index=False) 
df6['ASOFDATE'] = df6['ASOFDATE'].apply(lambda x:x.date().strftime('%d%m%y')) 
worksheet = writer.sheets['Frogs'] 
format5 = workbook.add_format({'num_format': '0.00%'}) 
#format6= workbook.add_format({'num_format': 'mmm d yyyy'}) 
#worksheet.set_column('A:A', 18, format6) 
worksheet.set_column('B:B', 18, format5) 
worksheet.set_column('C:C', 18, format5) 
worksheet.set_column('D:D', 18, format5) 
now = datetime.now() 
date= dt.datetime.today().strftime("%m/%d/%Y") 
link_format = workbook.add_format({'color': 'black', 'bold': 1}) 
nrows = df6.shape[0] 
worksheet.write(0, 0, 'Chart4', link_format) 
worksheet.write(1, 0, 'Frogs',link_format) 
#Multiply dataframe by 100 to get out of decimals (this method is used when dates are in the picture) 
df6[df6.columns[np.all(df6.gt(0) & df6.lt(1),axis=0)]] *= 100 
print df6 
writer.save() 

Answer 1

strftime的创造，后来被格式化，并根据其格式模板由Excel中显示日期时间值的文本表示。我们可以在我们的ExcelWriter构造函数中使用date_format参数来更改此格式模板，例如：writer = pandas.ExcelWriter("test.xlsx", engine="xlsxwriter", date_format="ddmmyyyy")。我已经略微修改了您的示例：

import pandas as pd 
import datetime 
df = pd.DataFrame() 
df['ASOFDATE'] = [datetime.datetime.now() for x in xrange(3)] 
for i in xrange(3): 
    df[i] = [1,2,3] 
df6 = df 
writer = pd.ExcelWriter('test.xlsx', engine='xlsxwriter', date_format="ddmmyyyy") 
workbook = writer.book 
df6.to_excel(writer, sheet_name= 'Frogs', startrow= 4, index=False) 
worksheet = writer.sheets['Frogs'] 
format5 = workbook.add_format({'num_format': '0.00%'}) 
worksheet.set_column('B:B', 18, format5) 
worksheet.set_column('C:C', 18, format5) 
worksheet.set_column('D:D', 18, format5) 
link_format = workbook.add_format({'color': 'black', 'bold': 1}) 
worksheet.write(0, 0, 'Chart4', link_format) 
worksheet.write(1, 0, 'Frogs',link_format) 
writer.save() 

此代码会生成一个文件，该文件具有根据指定模板格式化的日期值。