Short video learning - 7, pandas missing values of DataFrame

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# Missing values of pandas

Brief introduction

# Pandas mainly used to represent the data value np.nan missing. By default, it is not included in the calculation.

Common Operations

# Reconstruction index REINDEX stored as copy () 
# missing values stored fill value for a copy fillna () 
# Boolean value determines whether a NaN, isna () and notna () method 
# delete entire row of data stored default values a copy dropna ()

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# New structure and a data set using the methods described above

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