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我试图从一个pandas dataframe加入到另一个列中，使用其日期作为索引。但是，我的代码生成TypeError。请有人可以解释为什么这个错误正在产生，我能做些什么来解决它？尝试按索引加入熊猫数据框时出现TypeError
在此先感谢。
"""Balsjo THg, MeHg, TOC | Q and flux data 2005-2010"""
path2 = 'C:\\Users\\Google Drive\\SLU\\Thesis\\Data\\BalsjSite4.xls'
df2 = pd.io.excel.read_excel(path2, 'THg', header=0, parse_dates=[1], dayfirst=True, index_col='Date')
df3 = pd.io.excel.read_excel(path2, 'MeHg', header=0, parse_dates=[1], dayfirst=True, index_col='Date')
df4 = pd.io.excel.read_excel(path2, 'TOC', header=0, parse_dates=[1], dayfirst=True, index_col='Date')
print list(df2.columns.values)
print list(df3.columns.values)
print list(df4.columns.values)
cln_df2 = df2[['Q (mm/d)', 'THg (ng/L)', 'Flux']]
cln_df22 = cln_df2.append[df3[['MeHg (ng/L)']]]
print cln_df22.head()
---------------------------------------------------------------------------
TypeError Traceback (most recent call last)
<ipython-input-5-4f468a92d5ce> in <module>()
9 print list(df4.columns.values)
10 cln_df2 = df2[['Q (mm/d)', 'THg (ng/L)', 'Flux']]
---> 11 cln_df22 = cln_df2.append[df3[['MeHg (ng/L)']]]
12 print cln_df22.head()
TypeError: 'instancemethod' object has no attribute '__getitem__'
[u'Q (mm/d)', u'THg (ng/L)', u'RIM THg', u'Flux', u'Rim Flux', u'Error', 'Unnamed: 7', 'Unnamed: 8', 'Unnamed: 9', 'Unnamed: 10', 'Unnamed: 11', 'Unnamed: 12', 'Unnamed: 13', 'Unnamed: 14', 'Unnamed: 15', u'z', u'ae(bz)', u'c0e(fz)']
[u'Q (mm/d)', u'MeHg (ng/L)', u'RIM MeHg', u'Flux', u'Rim Flux', u'Error', 'Unnamed: 7', 'Unnamed: 8', 'Unnamed: 9', 'Unnamed: 10', 'Unnamed: 11', 'Unnamed: 12', 'Unnamed: 13', 'Unnamed: 14', 'Unnamed: 15', u'z', u'ae(bz)', u'c0e(fz)']
[u'Q (mm/d)', u'TOC (mg/l)', u'RIM TOC', u'Flux', u'Rim Flux', u'Error', 'Unnamed: 7', 'Unnamed: 8', 'Unnamed: 9', 'Unnamed: 10', 'Unnamed: 11', 'Unnamed: 12', 'Unnamed: 13', 'Unnamed: 14', 'Unnamed: 15', u'z', u'ae(bz)', u'c0e(fz)']
我认为你要做到这一点'cln_df22 = cln_df2.append（DF3 [ '甲基汞（纳克/升）']） '，你试图从append属性的数据框中访问不存在的项目 – EdChum
@EdChum好的，谢谢你的解决方案和解释。 – Bprodz