python dataframe unionall

方法一:
# -*- coding: UTF-8 -*-
import pandas as pd
df1 = pd.DataFrame([{'col1':'a', 'col2':1}])
df2 = pd.DataFrame([{'col1':'b', 'col2':2}])
df3 = pd.DataFrame([{'col1':'c', 'col2':3}])
lists = [df1, df2, df3]

df = pd.concat(lists)
print df
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输出结果:
co12 col1
0     1    a
0     2    b
0     3    c

方法二:
# -*- coding: UTF-8 -*-
import pandas as pd
df1 = pd.DataFrame([{'col1':'a', 'col2':1}])
df2 = pd.DataFrame([{'col1':'b', 'col2':2}])

df = df1.appen(df2)
print df
----------
输出结果:
co12 col1
0     1    a
0     2    b