MetaSerialisable对象参数后，**必须是一个映射，不是Unicode

Question

尝试此样式器对象转换为XLSX表：

avg.style.background_gradient(cmap='RdYlGn',low=.09,high=.18,axis=1).to_excel('test.xlsx',engine='xlsxwriter') 

但是，我得到的错误：

TypeError: MetaSerialisable object argument after ** must be a mapping, not unicode 

当我尝试：

avg.style.background_gradient({'cmap':'RdYlGn'},low=.09,high=.18,axis=1).to_excel('test.xlsx',engine='xlsxwriter') 

TypeError: ("unhashable type: 'dict'", u'occurred at index (Gain/Expsr%, 5)') 

有了这一个在这里，这里还有没有背景渐变输出：

writer = pd.ExcelWriter('usher.xlsx') 
df.style.background_gradient(cmap='RdYlGn').to_excel(writer,engine='openpyxl') 
writer.save() 

Answer 1

大熊猫斯泰勒使用openpyxl为Excel的引擎时，仅在to_excel()支持。同样来自Pandas docs，它似乎只能在Html输出中支持background_gradient。

作为替代方案，您可以使用XlsxWriter and Pandas而不是Excel中的条件格式。

import pandas as pd 


# Create a Pandas dataframe from some data. 
df = pd.DataFrame({'Data': [10, 20, 30, 20, 15, 30, 45]}) 

# Create a Pandas Excel writer using XlsxWriter as the engine. 
writer = pd.ExcelWriter('pandas_conditional.xlsx', engine='xlsxwriter') 

# Convert the dataframe to an XlsxWriter Excel object. 
df.to_excel(writer, sheet_name='Sheet1') 

# Get the xlsxwriter workbook and worksheet objects. 
workbook = writer.book 
worksheet = writer.sheets['Sheet1'] 

# Apply a conditional format to the cell range. 
worksheet.conditional_format('B2:B8', {'type': '3_color_scale'}) 

# Close the Pandas Excel writer and output the Excel file. 
writer.save()