import pandas as pd
import numpy as np
# Pandas 可以根据索引实现数据自动对齐,索引不重合的部分被置为NaN
df1 = pd.DataFrame(np.random.randint(low=1, high=10, size=(3,4)), columns=['a','b','c','d'])
df2 = pd.DataFrame(np.random.randint(low=1, high=10, size=(4,5)), columns=['a','b','c','d','e'])
df3 = pd.DataFrame(np.random.randint(low=1, high=10, size=(3,4)), columns=['e','f','g','h'])
print(df1)
print(df2)
print(df3)
print(df1 + df2)
print(df1 + df3)
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